Kurukshetra University 2009 M.Sc Electronic Science Net - Question Paper
Answer Sheet No.
(To be filled by the Candidate)
Roll No.
(In figures as per admission card)
Signature and Name of Invigilator
I. (Signature)_
(Name)_
Roll No..
2. (Signature). (Name)2
(In words) Test Booklet No.
D-8805
Time : IV4 hours]
[Maximum Marks : 100
PAPER II
ELECTRONIC SCIENCE
Number of Questions in this Booklet : 50
Number of Pages in this Booklet : 12
2.
3.
(ii)
(iii)
(iii)
4.
4.
5.
7.
Instructions for the Candidates
I. Write your roll number in the space provided on the top of this
page.
This paper consists of fifty multiple-choice type of questions.
At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below :
(i) To have access to the Question Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet.
(ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given.
After this verification is over, the Serial No. of the booklet should be entered in the Answer-sheets and the Serial No. of Answer Sheet should be entered on this Booklet.
Each item has four alternative responses marked (A), (B), (C) and (D). You have to darken the oval as indicated below on the correct response against each item.
Example : CD CD)
where (C) is the correct response.
5. Your responses to the items are to be indicated in the Answer Sheet given inside the Paper I booklet only. If you mark at any place other than in the ovals in the Answer Sheet, it will not be evaluated.
6. Read instructions given inside carefully.
7. Rough Work is to be done in the end of this booklet.
8. If you write your name or put any mark on any part of the test booklet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification.
9. You have to return the test question booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall.
10. Use only Bluflack Ball point pen.
II. Use of any calculator or log table etc., is prohibited.
12. There is NO negative marking.
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ELECTRONIC SCIENCE PAPER II
Note : This paper contains fifty (50) objective-type questions, each question carrying two (2) marks. Attempt all of them.
I. The threshold voltage of an n-channel MOSFET can be increased by :
(A) increasing the channel dopoint concentration
(B) decreasing the channel dopoint concentration
(C) reducing the gate oxide thickness
(D) reducing the channel length
2. The potential difference between two points can be expressed as
(A) Volt per meter (B) Watt per ampere
(C) Coulomb per Newton (D) Volt per ampere
3. Laplace transform of e at sin wt is :
w
w
(A)
(B)
(s I a)2 I w2
(s - a)2 I w2
w
w
(C)
(D)
(s - a)2 - w2
(s I a)2 - w2
4. In a linear network the ratio of voltage excitation to current response is unaltered when position of excitation and response are interchanged. This assertion stems from :
(A) principle of duality (B) principle of superposition
(C) reciprocity theorem (D) equivalent theorem
5. The bandwidth of an amplifier can be increased by :
(A) decreasing the capacitance of its bypass filter
(B) increasing input signal frequency
(C) cascading it
(D) minimising its stray capacitance
6. Without the DC source, a clipper acts like a :
(A) rectifier (B) clamper (C) demodulator (D) chopper
7. In order to build a mod-6 counter using three flip-flops the number of possible count sequence is :
(A) 4 (B) 8 (C) 16 (D) 28
8. The content of a 4-bit register is 1101. The register is shifted 6 times to the right with serial input being 101101. The final content of the register will be :
(A) 1011 (B) 0010 (C) 1010 (D) 0111
9. A microprocessor with a 16-bit address bus is used in linear memory selection configuration with 4 memory chips, the maximum addressable memory space is :
(A) 64 k (B) 16 k (C) 8 k (D) 4 k
10. The interface chip used for data transmission between 8086 and 16 bit ADC is :
(A) 8259 (B) 8255 (C) 8253 (D) 8251
11. The FORTRAN statement A = 2.5, J = 5*A 2**4/2 will calculate J as :
(A) 12 (B) 8.5 (C) 4.5 (D) 4
12. A pointer is a variable that contains as its value :
(A) the dimension of another variable
(B) the address of another variable
(C) the size of another variable
(D) the value of another variable
13. An electromagnetic wave travels in free space with electric field component
E = 100ej (0866y+05z) V x
Its angular frequency, w, is :
(A) 3x108 m/s (B) 3x108 rad/s (C) 1.5 x108 rad/s (D) 108 rad/s
14. The behaviour of which of the following devices is governed by bulk effect :
(A) Gunn diode (B) PIN diode
(C) Tunnel diode (D) IMPATT diode
15. A frequency modulated signal is expressed as :
(A) A cos [ wct I K m(t) ] (B) A cos [ wct I 9 ]
(C) A cos (wct) (D) A cos [ wct + K m (k) d X ]
16. In PCM system if the quantisation levels are increased from 2 to 8, the relative bandwidth requirement will :
(A) become four times (B) remain same
(C) be tripled (D) be doubled
17. Optical communication systems generally use :
(A) amplitude modulation (B) frequency modulation
(C) phase modulation (D) intensity modulation
18. A device that exhibits a negative resistance region is :
(A) p-n diode (B) UJT (C) JFET (D) BJT
19. A pyrometer is used to measure :
(A) temperature (B) pressure (C) light intensity (D) low currents
20. A linear discrete-time system has the characteristic equation z3 0.81z = 0. The system : (A) is stable (B) is marginally stable
(C) is unstable (D) stability cannot be assessed
(Question No. 21 to 30) :
The following items consist of two statements. One labelled the "Assertion A" and the other labelled the "Reason R". You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly :
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false
(D) (A) is false but (R) is true
21. Assertion (A) : At high temperature, the avalanche breakdown voltage is higher.
Reason (R) : At higher temperature mean free paths of electrons and holes
are shorter, therefore a larger field is required to cause ionisation.
The Wien Bridge can be used for frequency measurements. The Wien Bridge uses only capacitors and resistors.
A demultiplexer cannot be used as a decoder. A demultiplexer is built using AND gates only.
22. Assertion (A) Reason (R)
23. Assertion (A) Reason2 (R)
24. Assertion (A) Reason2 (R)
In Intel 8085, the lower byte of address and data are multiplexed. This helps limit the number of external pin terminals.
The solution of Poisson equation is the same as the solution of Laplace equation.
The Laplace equation is the same as Poisson equation for source free region.
25. Assertion (A)
Reason (R)
The total emf induced in a circuit equals the time rate of change of the total magnetic flux linking the circuit.
26. Assertion (A)
The induced current in a loop is always so directed as to produce a flux opposing the change in the flux density.
Reason (R)
27. Assertion (A) Reason (R)
28. Assertion (A) Reason (R)
29. Assertion (A) Reason (R)
30. Assertion (A) Reason2 (R)
AM has better noise performance than FM. AM results in increase in signal power.
Optical communication has shifted from 1.3 |xm to 1.55 |xm in silica fibers.
Dispersion and attenuation are both minimum at 1.55 |xm.
Thyristors are preferred to power diodes in variable power rectifiers.
Thyristors provide controlled rectification and also power loss in them is less compared to that in power diodes.
An important property of laser radiation is its coherence. Stimulated emission is the key to the operation of LASER.
31. Consider the following semiconductor diodes :
1. Germanium diode
2. Silicon diode
3. Tunnel diode
4. Schottky diode
The correct increasing order of forward voltage drop of the above diodes is :
(A) I, 3d 4, 2 (B) I, 2, 3, 4 (C) 3, 4, 2, I (D) 3, I, 4, 2
32. In the microwave region some of the band designations are Ku, X, K and Ka. The order according to their allocated frequency band is :
(A) Ku, X, K, Ka (B) X, Ku, K, Ka
(C) Ka, Ku, K, X (D) K, X, Ku, Ka
33. Consider the Analog to Digital converters given below :
1. Successive approximation ADC
2. Dual Ramp ADC
3. Counter method ADC
4. Simultaneous ADC
The correct sequence of the ascending order in terms of conversion times of the above ADC's is :
(A) 3, 2, 4, I (B) 2, 3, 4, I (C) 2, 3, I, 4 (D) 3, 2, I, 4
34. The various subsystems in an FM receiver are arranged as :
1. Mixer, RF amplifier, limiter, IF amplifier, discriminator, audio amplifier
2. RF amplifier, mixer, IF amplifier, limiter, discriminator, audio amplifier
3. RF amplifier, mixer, limiter, discriminator, IF amplifier, audio amplifier
4. Mixer, IF amplifier, limiter, audio amplifier, discriminator, RF amplifier The correct sequence of subsystems is :
(A) I (B) 2 (C) 3 (D) 4
35. Four main types of telephone exchanges available in India are :
1. Manual
2. Electronic
3. Strowger
4. Cross-bar
The correct order in which they appeared in our country is :
(A) I, 2, 3, 4 (B) 2, I, 4, 3 (C) I, 3, 4, 2 (D) I, 4, 3, 2
(Q.No. 36 to 45) : In the following questions Match List - I with List - II and select
the correct answer using the codes given below the lists.
|
36. |
List - I |
List - II | ||||
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(a) |
BJT |
(i) |
Negative resistance | |||
|
(b) |
MOSFET |
(ii) |
High current gain | |||
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(c) |
Tunnel Diode |
(iii) |
Voltage regulation | |||
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(d) |
Zener Diode |
(iv) |
High input impedance | |||
|
Code |
(a) |
(b) |
(c) |
(d) | ||
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(A) |
(i) |
(ii) |
(iii) |
(iv) | ||
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(B) |
(ii) |
(iv) |
(i) |
(iii) | ||
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(C) |
(iv) |
(iii) |
(ii) |
(i) | ||
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(D) |
(iii) |
(i) |
(ii) |
(iv) | ||
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37. |
List - I |
List - II | ||||
|
(a) |
Linearity |
(i) |
Superposition theorem | |||
|
(b) |
Structure |
(ii) |
Norton's theorem | |||
|
(c) |
Equivalent circuit |
(iii) |
Tellegan's theorem | |||
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(d) |
Bilateral |
(iv) |
Reciprocal theorem | |||
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Code |
(a) |
(b) |
(c) |
(d) | ||
|
(A) |
(iii) |
(ii) |
(iv) |
(i) | ||
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(B) |
(iv) |
(i) |
(ii) |
(iii) | ||
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(C) |
(i) |
(ii) |
(iii) |
(iv) | ||
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(D) |
(i) |
(iii) |
(ii) |
(iv) | ||
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D 8805 |
7 | |||||
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39. 40. |
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List2-2II Gauss' Law for electric field Ampere's Law Faraday's Law Gauss' Law for magnetic field C - Program Array Real variable Memory address | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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43. List - I (a) AM Broadcast (b) FM Broadcast (c) TV Broadcast (d) Point to Point |
(i) Multipath phenomenon (ii) 535 - 1600 KHz (iii) VSB modulation (iv) 88 - 108 MHz |
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List - II (i) Pressure (ii) Temperature (iii) Displacement (iv) Stress | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
45. List - I
List - II
(i) Bandwidth
(ii) LCD
(iii) Laser
(iv) Optical fiber
(a) Polarisation
(b) Coherence
(c) Total internal reflection
(d) Dispersion
|
Code: |
(a) |
(b) |
(c) |
(d) |
|
(A) |
(ii) |
(iii) |
(iv) |
(i) |
|
(B) |
(i) |
(ii) |
(iii) |
(iv) |
|
(C) |
(iv) |
(iii) |
(ii) |
(i) |
|
(D) |
(ii) |
(i) |
(iii) |
(iv) |
Para phrasing (Read the paragraph and answer the question nos. 46 to 50) :
In 1990 Planck proposed, in order to explain the distribution of energy in the spectrum of black body, that an oscillating electron may not radiate or absorb energy continuously, as required by classical electrodynamics, but only in integral multiplas of a fundamental unit called quantum. If f is the frequency of radiation, the energy of a quantum is given by E = hv where h is a constant known as Planck's constant.
In 1905, Einstein went further and suggested that light, or electromagnetic radiation in general, might sometimes be regarded having a corpuscular or particle like nature. The light particles, or quanta, are called photons. Photons are peculiar in that they travel with the speed of light and have zero rest mass.
What is important to notice is that light can be thought of either as waves with particle like properties or as particles with wave like properties. In 1924 de Broglie generalised the idea and suggested that any moving particle with mass m and speed v, will in some experiments display wave - like properties with wavelength \ = h/mv.
46. A quantum of visible light is called :
(A) Photon (B) Proton (C) Hyperon (D) Phonon
47. A quantum will have more energy if :
(A) the wavelength is longer (B) the frequency is higher
(C) the amplitude is higher (D) the velocity is greater
48. A photon has its velocity in vacuum equal to :
(A) 3x10W cm/sec (B) 3x1010 cm/sec
(C) 3 x 1010 km/sec (D) 9 x 1010 cm/sec
49. For an electron (mass = 9.1x1028 gm) moving with a speed of 5.9 x108 cm/sec, the accompanying wave will have a wavelength of :
(A) 1.2x108 cm (B) 1.2x10"10 cm
(C) 1.2x10"6 cm (D) 1.2x10"12 cm
50. The electron microscope works on the basis of :
(A) refraction of light in lenses
(B) wave - like properties of electron in motion
(C) pressure exerted by electron beam
(D) production of electromagnetic waves by impact of electrons on matter.
- o O o -
D 8805 12
Signature and Name of Invigilator
I. (Signature)_
Roll No.
(In figures as per admission card)
(Name)_
Roll No..
2. (Signature). (Name)2
(In words) Test Booklet No.
D-8805
Time : 2V2 hours]
[Maximum Marks : 200
PAPER III
ELECTRONIC SCIENCE
Number of Questions in this Booklet : 26
Number of Pages in this Booklet : 32
|
Instructions for the Candidates Write your roll number in the space provided on the top of this page. Answers to short answer/essay type questions are to be given in the space provided below each question or after the questions in the Test Booklet itself. 2. No Additional Sheets are to be used. At the commencement of examination, the question booklet will be given to you. In the first S minutes, you are requested to open the booklet and compulsorily examine it as below : 3. (i) To have access to the Test Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of S minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given. Read instructions given inside carefully. 4. 5. 6. One page is attached for Rough Work at the end of the booklet before the Evaluation Sheet. If you write your name or put any mark on any part of the Answer Sheet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification. 7. You have to return the Test booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. 8. Use only Blue/Black Ball point pen. 9. Use of any calculator or log table etc. is prohibited. 10. There is NO negative marking. |
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PAPER III
NOTE:
This paper is of two hundred (200) marks containing four (4) sections. Candidates are required to attempt the questions contained in these sections according to the detailed instructions given therein.
Note : This section contains five (5) questions based on the following paragraph. Each question should be answered in about thirty (30) words and each carries five (5) marks.
In a PLL circuit the VCO natural frequency is 150 kHz, the input frequency is 160 kHz, the phase comparator transfer function is 0.2 V/rad., the low pass filter gain is equal to 1, the amplifier gain is equal to 4 and the voltage controlled oscillator gain is 15 kHz/volt.
I. Calculate the PLL open loop gain.
3. Calculate the phase detector output voltage.
5. Calculate the static phase error and draw the PLL block diagram.
Note : This section contains fifteen (15) questions each to be answered in about thirty (30) words. Each question carries five (5) marks.
6. What is the difference between avalanche and zener breakdown ?
8. State and prove the Superposition theorem.
9. Using De Morgan's Law show how to implement an OR gate using AND and NOT gate.
10. Describe the application of Schmitt trigger as a squaring circuit.
II. How many types of memories are available ? Distinguish between static and dynamic memories.
12. List out the various steps involved in Object Oriented Programming.
14. Explain the basic principle of single stub matching.
16. Draw the block diagram for generating and detecting PSK signals.
18. Distinguish between multimode and single-mode optical fibers.
19. What is piezoelectric effect ? Name two materials that exhibit piezoelectric effect and their applications.
20. State Routh-Hurwitz criterion and explain its significance.
Note : This section contains five (5) questions. Each question carries twelve (12) marks and is to be answered in about two hundred (200) words.
21. Design a bistable multivibrator circuit using IC 555. Depict its input and output waveforms for various input settings.
22. (a) Describe the architecture of 8086 microprocessor.
(b) Verify the following equation by using Boolean algebra :
AB + AC I BC = AC I BC
23. (a) Write Maxwell's equations in differential and integral forms. Derive the wave
equation.
(b) In a rectangular waveguide for which a = 1.5 cm, b = 0.8 cm, ct = 0, |x = q and
= 4 eo.
u . | tx } (3 t y' Hx = 2 sin |-| cos
sin x 1011 t p z)A
m
Determine (i) the mode of operation, (ii) the cut-off frequency, (iii) the phase constant p.
24. (a) Describe the dispersion and attenuation characteristics of typical silica optical
fibers.
(b) Explain the functioning of a PIN photodiode. Define responsivity, quantum efficiency and noise equivalent power of a photo diode.
25. Explain the principle and operation of an electron microscope.
Note2 : This section consists of one essay type question of forty (40) marks to be answered in about one thousand (1000) words on any of the following topics.
26. (a) Explain the functioning of :
(i) monostable
(ii) bistable and
(iii) astable multivibrator.
Discuss the output waveforms.
(b) Discuss the Modulation and Demodulation of PM, PCM, ASK and FSK systems.
a
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Signature and Name of Invigilator
1. (Signature)_
(Name)_
Answer Sheet No. : .
(To be filled by the Candidate)
Roll No.
(In figures as per admission card)
Roll No.
2. (Signature) . (Name)
D8 8 0 6
Time : 1 hours]
(In words)
Test Booklet No.
PAPERII
ELECTRONIC SCIENCE [Maximum Marks : 100
Number of Pages in this Booklet : 16
Number of Questions in this Booklet : 50
|
Instructions for the Candidates 1. Write your roll number in the space provided on the top of this page. 2. This paper consists of fifty multiple-choice type of questions. 3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below : (i) To have access to the Question Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given. (iii) After this verification is over, the Serial No. of the booklet should be entered in the Answer-sheets and the Serial No. of Answer Sheet should be entered on this Booklet. 4. Each item has four alternative responses marked (A), (B), (C) and (D). You have to darken the oval as indicated below on the correct response against each item. Example : CD) where (C) is the correct response. 5. Your responses to the items are to be indicated in the Answer Sheet given inside the Paper I booklet only. If you mark at any place other than in the ovals in the Answer Sheet, it will not be evaluated. 6. Read instructions given inside carefully. 7. Rough Work is to be done in the end of this booklet. 8. If you write your name or put any mark on any part of the test booklet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification. 9. You have to return the test question booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. 10. Use only Blue/Black Ball point pen. 11. Use of any calculator or log table etc., is prohibited.
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ELECTRONIC SCIENCE
Note : This paper contains fifty (50) objective-type questions, each question carrying two (2) marks. Attempt all of them.
1. An electron rising through a potential of 250 V will acquire an energy of :
(A) 250 eV
(B) 800 eV
(C) 250 J
(D) 800 J
2. If the amount of impurity, either donor type or acceptor type added to the intrinsic semiconductor is controlled to 1 part in one million, the conductivity of the sample :
(A) increases by a factor 103
(B) reduces by a factor 10 - 3
(C) increases by a factor 106
(D) reduces by a factor 10 - 6
3. The fourier transform of a function on X (t) is X (f ). The fourier transform of d X (f)
d f
will be :
|
(B) j 2 f x (f ) |
 |
4. Laplace transform and Fourier integrals are related through :
(A) frequency domain
(B) time domain
(C) both frequency and time domain
(D) none
(i) adds or subtracts a dc voltage to or from a waveform
(ii) does not change the shape of the waveform
(iii) amplifies the waveform
(A) (i) and (ii) are correct
(B) (i) and (iii) are correct
(C) (ii) and (iii) are correct
(D) (i), (ii) and (iii) are correct
6. The amplifier gain with positive feedback is given by A
1 + pA
(A)
(B)
(C)
A 1- pA
A
p 1- P
1- A
(D)
7. A ring counter consisting of five flip flop will have :
(A) 5 states
(B) 10 states
(C) 32 states
(D) infinite states
8. Which one of the following can be used as parallel to series converter ?
(A) Decoder
(B) Encoder
(C) Digital counter
(D) Multiplexer
9. An interrupt in which the external device supplies its address as well as the interrupt request, is known as :
(A) vectored interrupt
(B) maskable interrupt
(C) polled interrupt
(D) non-maskable interrupt
10. In 8085 microprocessor, the value of the most significant bit of the result following the execution of any arithmetic of Boolean instruction is stored in the :
(A) carry status flag
(B) auxiliary carry status flag
(C) sign status flag
(D) zero status flag
11. An instruction that can be recognized and used without translation must be written in :
(A) Source code
(B) Machine code
(C) Basic language
(D) Assembly code
12. What is the name of the arrangement where by several central processing units share one memory ?
(A) Multitasking
(B) Multiprogramming
(C) Multiprocessing
(D) Concurrent programming
13. The angle for which there is no reflection and the incident wave is vertically polarized is known as :
(A) Steradian angle
(B) Reflection angle
(C) Brewster's angle
(D) Critical angle
14. The characteristic impedance of a transmission line is given by
(B)
(C)
L
(D) VLC
15. A PLL can be used to demodulate :
(A) PAM signals
(B) PCM signals
(C) PM signals
(D) DSB-SC signals
16. The main function of balanced modulator is to :
(A) produce balanced modulation of a carrier wave
(B) produce 100 percent modulation
(C) suppress carrier signal in order to create a single side band or double side band
(D) limit noise picked up a receiver
17. An SCR can be termed as :
(A) DC switch
(B) AC switch
(C) Both DC and AC switch
(D) Square wave switch
18. Fiber optics communication offers the largest bandwidth in the range of
(A) 1010 Hz
(B) 106 Hz
(C) 1014 Hz
(D) 1020 Hz
19. Silicon photosensors have their maximum spectral response in the :
(A) infrared region
(B) ultraviolet region
(C) visible region
(D) X-ray region
k
, the system is :
S2 (Ts + 1)
20. Open loop transfer function is given by G (S) H (S) =
(A) stable
(B) unstable
(C) marginally stable
(D) absolutely stable
21. Match List-I with List-II and select the correct answer using the codes given below the lists :
|
List-I |
List-II | ||||
|
(a) |
Zener diode |
(i) |
High speed switching | ||
|
(b) |
Tunnel diode |
(ii) |
Multivibrator circuits | ||
|
(c) |
Gunn diode |
(iii) |
Voltage stabilizer | ||
|
(d) |
PIN diode |
(iv) |
Microwave oscillator | ||
|
Codes : | |||||
|
(a) |
(b) |
(c) |
(d) | ||
|
(A) |
(iii) |
(i), (ii) |
(iv) |
(i) | |
|
(B) |
(iv) |
(ii), (iv) |
(iv) |
(i) | |
|
(C) |
(iv) |
(i), (iii), (iv) |
(i) |
(iii) | |
|
(D) |
(iii) |
(i), (ii), (iv) |
(iv) |
(i) | |
List-I
(Transducer)
List-II
(Measured Quantities)
Displacement
Pressure
(a) Venturi tube (i)
(b) Optical tachometer (ii)
(c) Linear Variable Differential (iii) Flow Transformer
|
(d) Pirani Gauge |
(iv) |
Velocity | |||
|
Codes : | |||||
|
(a) |
(b) |
(c) |
(d) | ||
|
(A) (i) |
(iv) |
(iii) |
(ii) | ||
|
(B) (iii) |
(ii) |
(i) |
(iv) | ||
|
(C) (i) |
(ii) |
(iii) |
(iv) | ||
|
(D) (iii) |
(iv) |
(i) |
(ii) | ||
|
23. Match List-I with List-II and select the correct answer using the codes given below the lists : | |||||
|
List-I |
List-II | ||||
|
(a) Frequency Modulation |
(i) |
Envelop detection | |||
|
(b) Double sideband suppressed carrier signal |
(ii) |
Companding | |||
|
(iii) |
Balance Modulator | ||||
|
(d) Amplitude Modulation |
(iv) |
Pre-emphasis and deemphasis | |||
|
Codes : | |||||
|
(a) |
(b) |
(c) |
(d) | ||
|
(A) (i) |
(ii) |
(iii) |
(iv) | ||
|
(B) (i) |
(ii) |
(iv) |
(iii) | ||
|
(C) (iv) |
(iii) |
(i) |
(ii) | ||
|
(D) (iv) |
(iii) |
(ii) |
(i) | ||
|
D8806 |
7 |
P.T.O. | |||
|
List-I (With respect to Magnetron average o/p power, dyty cycle) (a) 25 W (b) 50 W (c) 100 W |
(d) 150 W Codes : answer using the codes given below the List-II (With respect to Magnetron peak o/p power in Watts) (i) 6250 (ii) 5000 (iii) 2500 (iv) 1250 |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(iv) |
(iii) |
(ii) |
(i) |
|
(B) |
(iii) |
(iv) |
(ii) |
(i) |
|
(C) |
(i) |
(ii) |
(iii) |
(iv) |
|
(D) |
(iv) |
(iii) |
(i) |
(ii) |
|
Match the |
List-I |
with |
List | |
|
List- |
I | |||
(a) AND
List-II
(i) II
(ii) ! =
(iii) & &
(iv) !
(b) OR
(c) NOT
(d) NOT EQUAL Codes :
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(ii) |
(iii) |
(i) |
(iv) |
|
(B) |
(iii) |
(i) |
(iv) |
(ii) |
|
(C) |
(iv) |
(iii) |
(ii) |
(i) |
|
(D) |
(i) |
(ii) |
(iii) |
(iv) |
List-II (Bit position) 7 6 4
2
Codes :
List-I
(Status flag w.r.t 8085)
(a) Auxillary carry (i)
(b) Sign (ii)
(c) Zero (iii)
(d) Parity (iv)
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(ii) |
(iii) |
(iv) |
|
(B) |
(ii) |
(iii) |
(i) |
(iv) |
|
(C) |
(i) |
(ii) |
(iii) |
(iv) |
|
(D) |
(iii) |
(i) |
(iv) |
(ii) |
27. Match List-I with List-II and select the correct answer using the codes given below the lists :
|
List-I |
List-II | ||
|
(a) |
Solar Cell |
(i) |
Spontaneous emission |
|
(b) |
LED |
(ii) |
Stimulated emission |
|
(c) |
LASER |
(iii) |
Photovoltaic conversion |
|
(d) |
Reflex Klystron |
(iv) |
Velocity modulation |
|
Codes : | |||
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(iii) |
(i) |
(ii) |
(iv) |
|
(B) |
(i) |
(ii) |
(iii) |
(iv) |
|
(C) |
(ii) |
(iii) |
(iv) |
(i) |
|
(D) |
(iv) |
(i) |
(ii) |
(iii) |
|
List-I |
List-II | |
|
(a) ROM |
(i) |
Volatile memory |
|
(b) RAM |
(ii) |
Non-volatile memory |
|
(c) Magnetic Memory |
(iii) |
Erasable Programmable Read Only Memory |
|
(d) EPROM |
(iv) |
Permanent memory |
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(ii) |
(iv) |
(iii) |
|
(B) |
(ii) |
(i) |
(iv) |
(iii) |
|
(C) |
(iii) |
(i) |
(ii) |
(iv) |
|
(D) |
(iv) |
(iii) |
(ii) |
(i) |
29. Match List-I with List-II and select the correct answer using the codes given below the lists :
List-I
(a) Bit
(b) Byte
List-II
16 bit 1 bit
(i)
(ii)
|
(c) |
Nibble |
(iii) | ||
|
(d) |
8086 |
(iv) | ||
|
Codes : | ||||
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(ii) |
(iv) |
(iii) |
(i) |
|
(B) |
(i) |
(iii) |
(ii) |
(iv) |
|
(C) |
(iv) |
(ii) |
(i) |
(iii) |
|
(D) |
(iii) |
(iv) |
(ii) |
(i) |
List-I
With respect to copper film thickness (A), resistivity (Q-cm X10-7)
Surface resistance (Q / Square)
|
(a) 100, 0.52 |
(i) |
7.25 | |||
|
(b) 80, 0.58 |
(ii) |
21.50 | |||
|
(c) 60, 0.68 |
(iii) |
5.20 | |||
|
(d) 40, 0.86 |
(iv) |
11.33 | |||
|
Codes : | |||||
|
(a) |
(b) |
(c) |
(d) | ||
|
(A) (ii) |
(iii) |
(i) |
(iv) | ||
|
(B) (iii) |
(i) |
(iv) |
(ii) | ||
|
(C) (iv) |
(i) |
(iii) |
(ii) | ||
|
(D) (i) |
(ii) |
(iii) |
(iv) | ||
Assertion - Reason type questions :
Q. 31 to 40 : The following items consist of two statements, one labelled the 'Assertion (A)' and the other labelled the 'Reason (R)'. You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false
(D) (A) is false and (R) is true
31. Assertion (A) : Silicon is widely used in IC technology.
Reason (R) : Silicon technology is less expensive and SiO2 layer can be easily formed on silicon.
|
32. |
Assertion (A) : |
The greater the 'Q' the smaller the bandwidth of a resonant circuit. |
|
Reason (R) : |
At high frequencies the 'Q' of a coil falls due to skin effect. | |
|
33. |
Assertion (A) : |
In an Op-Amp circuit when one input terminal of the Op-Amp is grounded, the other terminal becomes virtual ground. |
|
Reason (R) : |
Input impedance of the Op-Amp is high. | |
|
34. |
Assertion (A) : |
Master-Slave JK flip-flop is free from race-around condition. |
|
Reason (R) : |
Master-Slave uses two JK flip-flops. | |
|
35. |
Assertion (A) : |
A processor can reference a memory stack without specifying an address. |
|
Reason (R) : |
The address is always available and automatically updated in the stack pointer. | |
|
36. |
Assertion (A) : |
Subroutines are used in larger programming. |
|
Reason (R) : |
Program testing at the program development time will be easier. | |
|
37. |
Assertion (A) : |
Two cavity Klystron is now-a-days frequently used as microwave amplifier. |
|
Reason (R) : |
Velocity and current modulation occurs in Klystron. | |
|
38. |
Assertion (A) : |
A half-adder is faster than full adder. |
|
Reason (R) : |
A half adder gives only one output while a full adder gives two outputs. | |
|
39. |
Assertion (A) : |
Optical fibers have broader bandwidth to conventional copper cables. |
|
Reason (R) : |
The information carrying capacity of optical fiber is limited by Rayleigh's scattering loss. | |
|
40. |
Assertion (A) : |
Piezoelectric crystals serve as a source of ultrasonic wave. |
|
Reason (R) : |
The crystals can generate wave having frequencies greater than 20 kHz. | |
|
D |
8806 |
12 |
41. Give sequence of the following interrupts on priority basis from highest to the lowest :
(i) RST 5.5
(ii) RST 6.5
(iii) RST 7.5
(iv) TRAP
Codes :
(A) (i), (ii), (iii), (iv)
(B) (ii), (iii), (i), (iv)
(C) (iii), (ii), (iv), (i)
(D) (iv), (iii), (ii), (i)
42. The highest data rate can be transmitted using the following cables :
(i) Twisted-wire cable
(ii) Co-axial cable
(iii) Fiber-optic cable
Code :
(A) (iii), (ii), (i)
(B) (i), (iii), (ii)
(C) (ii), (i), (iii)
(D) (i), (ii), (iii)
43. Write down the different computer network from lowest to the highest order :
(i) LAN
(ii) WAN
(iii) MAN
(A) (ii), (i), (iii)
(B) (iii), (i), (ii)
(C) (i), (ii), (iii)
(D) (i), (iii), (ii)
44. Consider the following rectifier circuits :
(i) Half-wave rectifier without filter
(ii) Full-wave rectifier without filter
(iii) Full-wave rectifier with series inductance filter
(iv) Full-wave rectifier with capacitance filter
The sequence of these rectifier circuits in decreasing order of their ripple factor is :
(A) (iii), (iv), (i), (ii)
(B) (i), (iv), (iii), (ii)
(C) (iii), (ii), (i), (iv)
(D) (i), (ii), (iii), (iv)
45. What is the correct sequence of the following steps for fabrication of monolithic, bipolar junction transistor ?
(i) Emitter diffusion
(ii) Base diffusion
(iii) Buried layer formation
(iv) Epilayer formation
Code :
(A) (iii), (iv), (i), (ii)
(B) (iv), (iii), (i), (ii)
(C) (iii), (iv), (ii), (i)
(D) (iv), (iii), (ii), (i)
Read the paragraph and answer the questions 46 to 50 :
Cathode ray oscilloscope is an electronic device which gives a visual representation of electrical quantities such as voltage and current waveforms in an electrical circuit. The name cathode ray is given because the electron beam was first thought to consists of rays from the cathode. A CRO consists of the Cathode Ray Tube (CRT), power supplies, time base circuit and deflection voltage amplifiers. The heart of cathode ray oscilloscope is CRT. Its chief advantage is that it produces the visual representation directly with extremely high speed because of the high velocity of electrons.
46. The oscilloscope can be considered as a :
(A) low impedance instrument
(B) high impedance instrument
(C) medium impedance instrument
(D) infinite impedance instrument
47. Sawtooth waves are used most frequently to move the electron beam in an oscilloscope :
(A) back and forth across the screen
(B) up and down on the screen
(C) back and down on the screen
(D) none of the above
48. The deflection sensitivity of a CRT depends inversely on the :
(A) length of the vertical deflecting plates
(B) distance between screen and deflecting plates
(C) deflecting voltage
(D) separation between Y plates
49. Two complete signal cycles would be displaced on the screen scope when time period of the sweep generator is_the signal time period.
(A) half
(B) twice
(C) equal
(D) thrice
50. An electrostatic cathode ray oscilloscope is a :
(A) current indicating device
(B) voltage indicating device
(C) Both (A) and (B) above
(D) None of the above
- o O o -
D8806 16
Signature and Name of Invigilator
1. (Signature)_
Roll No.
(In figures as per admission card)
(Name)_
Roll No.
(In words)
Test Booklet No.
2. (Signature) . (Name)
D8 8 0 6
Time : 2% hours]
[Maximum Marks : 200
PAPERIII
ELECTRONIC SCIENCE
|
Number of Pages in this Booklet : 32 Instructions for the Candidates 1. Write your roll number in the space provided on the top of this page. 2. Answers to short answer/essay type questions are to be given in the space provided below each question or after the questions in the Test Booklet itself. No Additional Sheets are to be used. 3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below : (i) To have access to the Test Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given. 4. Read instructions given inside carefully. 5. One page is attached for Rough Work at the end of the booklet before the Evaluation Sheet. 6. If you write your name or put any mark on any part of the Answer Sheet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification. 7. You have to return the Test booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. 8. Use only Blue/Black Ball point pen. 9. Use of any calculator or log table etc. is prohibited. 10. There is NO negative marking. |
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This paper is of two hundred (200) marks containing four (4) sections. Candidates are required to attempt the questions contained in these sections according to the detailed instructions given therein.
NOTE :
Note : This section contains five (5) questions based on the following paragraph. Each question should be answered in about thirty (30) words and each carries five (5) marks.
Like bipolar transistor, the FET is a three-terminal device in which the current through two terminals is controlled at the third. Unlike the BJT, however, field-effect devices are controlled by a voltage at the third terminal rather than by a current. Another difference is that the FET is a unipolar device; that is, the current involves only majority carriers. The field-effect transistor comes in several forms. In a junction FET (called a JFET) the control (gate) voltage varies the depletion width of a reverse-biased p-n junction. A similar device results if the junction is replaced by a Schottky-barrier (metal-semiconductor FET, called a MESFET). Alternatively the metal gate electrode may be separated from the semiconductor by an insulator (metal insulator-semiconductor FET, called a MISFET). A common type uses an oxide layer as the insulator (MOSFET). The various types of FET are characterized by a high input impedance, since the control voltage is applied to a reverse-biased junction or Schottky barrier or across an insulator. These devices are particularly well suited for controlled switching between a conducting state and a non conducting state, and are therefore useful in digital circuits. In fact, millions of MOS transistors are commonly used together in semiconductor memory devices.
1. In JFET how the p - n junction control the effective cross-sectional area of a conducting channel.
3. Explain the operation of an enhancement mode MOSFET.
5. Discuss the mechanism of current flow beyond pinch off in enhancement mode MOSFET.
Note : This section contains fifteen (15) questions each to be answered in about thirty (30) words. Each question carries five (5) marks.
6. Explain with necessary diagram the various current components of an npn transistor and derive the relation between a and P for the transistor.
8. Define (a) accuracy (b) sensitivity (c) resolution with reference to DAC.
10. Illustrate the difference between structures and arrays in C programming.
12. Define the terms minimum length, optimum length and maximum length of pyramiddal horn antenna.
14. Explain what is meant by a graded index fiber, giving an expression for the possible refractive index profile.
16. Explain why fiber optic communication offers the largest bandwidth.
18. Discuss Hall effect in semiconductors.
19. What are four different types of control systems. Give example of each.
20. Mention different types of Memories.
Note : This section contains five (5) questions. Each question carries twelve
(12) marks and is to be answered in about two hundred (200) words.
21. Describe the physical mechanism of Zener breakdown. Draw a circuit which uses zener diode to regulate the voltage across a load.
22. State clearly the Thevenin's and Superposition theorems and explain their usefulness in linear network analysis.
23. Draw the circuits of OPAMP integrator and differentiator. Explain their operations.
24. Give a schematic diagram of gunn diode and explain its principle of working.
25. What is the difference between LED and LASER. Explain the operation of p - n junction laser with energy band diagram.
Note : This section consists of one essay type question of forty (40) marks to be answered in about one thousand (1000) words on any of the following topics.
26. (a) Explain the photovoltaic mode of operation of solar cell.
(b) Discuss triggering mechanism to switch SCR.
(c) Explain the operation of thermoelectric device
(d) What is Piezo-electric effect ? Mention some of its applications.
(a) Explain the functions of micro controller and discuss its advantages ore 8086 microprocessors.
(b) What are Interrupts ? Explain the following terms used in microprocessors.
(i) Instruction Cycle
(ii) Machine Cycle
(iii) T - States
(c) Write a program in C language to transfer data to the parallel port of a personal computer.
(d) With the help of block diagram, explain the architecture of 8085 microprocessor.
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Answer Sheet No.
(To be filled by the Candidate)
Roll No.
(In figures as per admission card)
Signature and Name of Invigilator
I. (Signature)_
(Name)_
Roll No..
2. (Signature). (Name)2
(In words) Test Booklet No.
D-8807
Time : IV4 hours]
[Maximum Marks : 100
PAPER II
ELECTRONIC SCIENCE
Number of Questions in this Booklet : 50
Number of Pages in this Booklet : 16
(ii)
(iii)
4.
5.
7.
|
12. There is NO negative marking. | ||||||
| ||||||
Instructions for the Candidates
1. Write your roll number in the space provided on the top of this
page.
2. This paper consists of fifty multiple-choice type of questions.
3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below :
(i) To have access to the Question Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet.
(ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given.
(iii) After this verification is over, the Serial No. of the booklet should be entered in the Answer-sheets and the Serial No. of Answer Sheet should be entered on this Booklet.
4. Each item has four alternative responses marked (A), (B), (C) and (D). You have to darken the oval as indicated below on the correct response against each item.
Example : CD CD)
where (C) is the correct response.
5. Your responses to the items are to be indicated in the Answer Sheet given inside the Paper I booklet only. If you mark at any place other than in the ovals in the Answer Sheet, it will not be evaluated.
6. Read instructions given inside carefully.
7. Rough Work is to be done in the end of this booklet.
8. If you write your name or put any mark on any part of the test booklet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification.
9. You have to return the test question booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall.
10. Use only Bluflack Ball point pen.
11. Use of any calculator or log table etc., is prohibited.
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Note : This paper contains fifty (50) objective-type questions, each question carrying two (2) marks. Attempt all of them.
1. In a tunnel diode, the width of depletion layer is of the order of :
(A) 10 Micron (B) 1 Micron
(C) 0.1 Micron (D) 1 Angstrom
2. The Major Component of MOSIC is :
(A) BJT (B) JFET (C) MOSFET (D) SCR
3. A network which contains one or more than one source of e.m.f. is known as :
(A) active network (B) passive network
(C) electric network (D) non-linear network
4. Norton's theorem results is :
(A) a current source with an impedance in parallel
(B) a voltage source with an impedance in series
(C) a voltage source alone
(D) a current source alone
5. The first generation of IC OP-AMP was :
(A) Fair Child |xA 709 (B) T.I SN 72709
(C) Motorola's MC 1709 (D) National Semiconductor's LM 709
6. The minimum number of diodes needed for a bridge rectifier is :
(A) 1 (B) 2 (C) 4 (D) 8
(A) 0100 1100 (B) 10011 (C) 10100 (D) 10101
|
Digital IC's do not use : (A) p-channel MOSFET (C) JFET |
(B) n-channel MOSFET (D) n-p-n transistor |
9. An address is the number used by the central processing unit for specifying a location in the :
(A) Flag (C) Memory
(B) Accumulator (D) Stack Pointer
|
10. 2x8 RAM stores : (A) 8, 2-bit data words (C) 16, 1-bit data words |
(B) 2, 8-bit data words (D) 1, 16-bit data words |
11. In a 8-bit Microcomputer having 8k bytes of RAM Memory, the length of stack pointer will be :
(A) 5
(B)
(C) 11
(D) 13
12. If the HLT instruction of 8085 Microprocessor is executed :
(A) The microprocessor is disconnected from the system bus
(B) The microprocessor enters into Halt State and the buses are tri-stated
(C) The microprocessor halts execution of the program and returns to stop state
(D) The microprocessor reloads the program from the location 0024H to about 0025H
(A) 100 ohms (B) 220 ohms (C) 377 ohms (D) 280 ohms
14. A PIN diode is :
(A) a metal semiconductor point contact diode
(B) a microwave mixer diode
(C) often used as a microwave detector
(D) suitable for use as a microwave switch
15. A deemphasis circuit is a :
(A) high-pass filter at the transmitter (B) low-pass filter at the transmitter
(C) high-pass filter at the receiver (D) low-pass filter at the receiver
16. An IC that contains A/D and D/A converters, comparaters and parallel to serial converters is called a :
(B) MODEM
(A) CODEC
(D) Data Discriminator
(C) Data Converter
17. The PUT is :
(A) not a thyristor
(B) like the UJT
(C) not a four layered device
(D) triggered ON and OFF by the gate to anode voltage
18. The value of the intrinsic-stand-off ratio for a UJT is :
(A) more than 1 (B) less than 1 (C) equal to 1 (D) 0
19. With the presence of feedback system the transient response (A) decays rapidly (B) rises slowly
(C) rises quickly (D) decays slowly
20. Electronic control systems have the problem of :
(A) operational difficulty (B) temperature sensitiveness
(C) low reliability (D) high reliability
Questions PI to 30 : The following items consist of two statements, one labelled the
"Assertion (A)" and the other labelled the "Reason (R)". You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true but (R) is not correct explanation of (A)
(C) (A) is true but (R) is false
(D) (A) is false but (R) is true
21. Assertion (A) : Strain gauge is an active transducer.
Reason (R) : Strain gauge converts mechanical displacement into change of resistance.
22. Assertion (A) : In a quartz crystal, at resonance the phase shift between output and
input is zero.
Reason (R) : Crystal oscillators provide an extremely stable and precise output frequency.
Reason (R) : The PID controller increases the order of the system to three.
The 'do-while' statement is used less frequently than the while statement.
24. Assertion (A)
Reason2(R) :
For most applications, it is more natural to test for continuation of a loop at the beginning rather than at the end of the loop.
The phase angle plot in Bode diagram is not affected by the variation in the gain of the system.
25. Assertion (A)
Reason2(R) :
The variation in the gain of the system has no effect on the phase margin of the system.
26. Assertion (A) : A monostable multivibrator can be used to alter the pulse width of a
repetitive pulse train.
Reason2(R) : Monostable multivibrator has a single stable state.
27. Assertion (A) : Optical fibers have broader band width to conventional copper cable.
Reason (R) : The information carrying capacity of optical fibers is limited by dispersion.
28. Assertion (A) : XOR gate is not a universal gate.
Reason (R) : It is not possible to realize any Boolean function using XOR gates only.
29. Assertion (A) : Semiconductors have negative temperature co-efficient of resistivity. Reason (R) : Insulators also have negative temperature co-efficient of resistivity.
30. Assertion (A) : Radio and Television receivers are generally of the super heterodyne
type.
Reason (R) : Wireless communication is possible by receiving signals through superheterodyne receivers.
31. The input resistance of a common emitter stage can be increased by :
(i) Unbypassing emitter resistance
(ii) Bootstrapping
(iii) Biasing it at low quescent current
(iv) Using compounded BJTs
The correct sequence in descending order of the effectiveness of these methods is :
(A) (ii), (iv), (i), (iii) (B) (iv), (iii), (ii), (i)
(C) (ii), (iv), (iii), (i) (D) (iv), (ii), (iii), (i)
32. Consider the following semiconductor diodes :
(i) Germanium diode
(ii) Silicon diode
(iii) Tunnel diode
(iv) Schottky diode
The correct increasing order of forward voltage drop of these diodes is :
(A) (i), (iii), (iv), (ii) (B) (i), (ii), (iii) (iv)
(C) (iii), (iv), (ii), (i) (D) (iii), (i), (iv), (ii)
33. The various processor chips which operate at different speeds are :
(i) 8086
(ii) P-II
(iii) P-III
(iv) 8085
The correct sequence according to their speed of operation in increasing order is :
(A) (i), (ii), (iii), (iv) (B) (iv), (i), (ii), (iii)
(C) (ii), (iii), (iv), (i) (D) (iii), (iv), (i), (ii)
34. Consider the following communication systems :
(i) F.M. Broadcast systems
(ii) A.M. Broadcast systems
(iii) Microwave communication systems
(iv) Optical communication systems
The correct sequence of these systems from the point of view of increasing order of frequency is :
(A) (i), (ii), (iii), (iv) (B) (iv), (ii), (i), (iii)
(C) (ii), (i), (iii), (iv) (D) (i), (iii), (iv), (ii)
35. The different types of memories are :
(i) Magnetic tape
(ii) Floppy disk
(iii) RAM
(iv) Hard disk
The correct sequence of decreasing order of memory is :
(A) (iv), (iii), (i), (ii) (B) (i), (iv), (iii), (ii)
(C) (i), (ii), (iv), (iii) (D) (ii), (i), (iii), (iv)
36. Match List-I with List-II and select the correct answer using the codes given below the lists :
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(iii) |
(ii) |
(iv) |
|
(B) |
(i) |
(ii) |
(iii) |
(iv) |
|
(C) |
(iii) |
(i) |
(iv) |
(ii) |
|
(D) |
(iv) |
(i) |
(iii) |
(ii) |
List-I
(a) Thevenin's theorem
List-II
(i) Open circuit
(ii) Unity
(iii) Passive circuit
(iv) Closed circuit
(b) Norton's theorem
(c) Laplace transform of impulse function
(d) Diode
Codes :
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(iv) |
(ii) |
(i) |
(iii) |
|
(B) |
(i) |
(iv) |
(ii) |
(iii) |
|
(C) |
(ii) |
(i) |
(iii) |
(iv) |
|
(D) |
(i) |
(ii) |
(iii) |
(iv) |
38. Match List-I with List-II and select the correct answer using the codes given below the lists :
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(ii) |
(iii) |
(iv) |
|
(B) |
(i) |
(ii) |
(iv) |
(iii) |
|
(C) |
(ii) |
(i) |
(iii) |
(iv) |
|
(D) |
(ii) |
(iii) |
(i) |
(iv) |
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(iv) |
(ii) |
(iii) |
|
f) |
(iv) |
(i) |
(ii) |
(iii) |
|
(C) |
(i) |
(iv) |
(iii) |
(ii) |
|
(D) |
(iv) |
(i) |
(iii) |
(ii) |
40. Match List-I with List-II and select the correct answer using the codes given below the lists :
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(ii) |
(i) |
(iv) |
(iii) |
|
f) |
(i) |
(ii) |
(iii) |
(iv) |
|
(C) |
(iv) |
(ii) |
(i) |
(iii) |
|
(D) |
(iii) |
(iv) |
(i) |
(ii) |
|
List-I |
List-II | ||
|
(a) |
Frequency modulation |
(i) |
Envelop detection |
|
(b) |
Double sideband suppressed carrier |
(ii) |
Companding |
|
(c) |
PCM |
(iii) |
Balanced Modulator |
|
(d) |
Amplitude modulation |
(iv) |
Pre-emphasis and de-emphasis |
|
Codes : | |||
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(ii) |
(iii) |
(iv) |
|
(B) |
(i) |
(ii) |
(iv) |
(iii) |
|
(C) |
(iv) |
(iii) |
(i) |
(ii) |
|
(D) |
(iv) |
(iii) |
(ii) |
(i) |
42. Match List-I with List-II and select the correct answer by using the codes given below the lists :
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(ii) |
(i) |
(iii) |
(iv) |
|
(B) |
(i) |
(ii) |
(iv) |
(iii) |
|
(C) |
(iv) |
(iii) |
(i) |
(ii) |
|
(D) |
(iii) |
(iv) |
(ii) |
(i) |
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(ii) |
(iii) |
(iv) |
|
(B) |
(ii) |
(iii) |
(i) |
(iv) |
|
(C) |
(iii) |
(iv) |
(i) |
(ii) |
|
(D) |
(iv) |
(i) |
(ii) |
(iii) |
44. Match List-I with List-II and select the correct answer using the codes given below the lists :
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(i) |
(iii) |
(iv) |
(ii) |
|
(B) |
(ii) |
(i) |
(iv) |
(iii) |
|
(C) |
(iii) |
(i) |
(iv) |
(ii) |
|
(D) |
(iv) |
(iii) |
(i) |
(ii) |
| ||||||||||||||||||||
|
Codes : |
|
(a) |
(b) |
(c) |
(d) | |
|
(A) |
(iii) |
(iv) |
(i) |
(ii) |
|
f) |
(iv) |
(iii) |
(i) |
(ii) |
|
(C) |
(iii) |
(iv) |
(ii) |
(i) |
|
(D) |
(i) |
(ii) |
(iii) |
(iv) |
Read the passage below and answer the questions that follow based on your understanding of the passage :
Many disturbances of an electrical nature produce noise in receivers, modifying the signal in an unwanted manner. In radio receivers, for example, noise may produce hiss in the loudspeaker output, whereas in television receivers 'snow' or coloured snow becomes superimposed in the picture. In pulse communication systems, noise may produce unwanted pulses or perhaps cancel out the wanted ones; it may cause serious errors in this faction. Noise is thus seen as limiting the range of systems, for a given transmitted power. It affects the sensitivity of receivers, by placing a limit on the weakest signals that can be amplified. It may sometimes even force a reduction in the bandwidth of a system as seen in radar.
There are numerous ways of classifying noise. It may be subdivided according to type, source, effect or relation to the receiver and noise created within the receiver itself. On the other hand, external noise is difficult to treat quantitatively. Radiotelescopes and International satellite earth stations are located in noise-free valleys. Internal noise is both more quantifiable and capable of being reduced by appropriate receiver design.
Atmospheric noise becomes less severe at frequencies above 30 MHz because of two separate factors. First the higher frequencies are limited to line-of-sight propagation less than 80 km. Second the nature of the mechanism generating this noise such that very little of it is created in the very high frequency range.
46. Why noise is considered as important parameter in telecommunication ?
(A) noise of some type may not create unwanted signal
(B) noise interferes in introducing unwanted signals at the receiver
(C) noise may increase the frequency of the receiver
(D) noise may decrease the amplitude of the pulse in communication system
47. The effect of internal and external noise on radar is that :
(A) the bandwidth of the radar increases
(B) the bandwidth of the radar decreases
(C) the temperature of the radar decreases
(D) the amplitude of the radar signal decreases
48. One of the following types of noise becomes of great importance at high frequencies. It is the :
(A) Shot noise (B) Random noise
(C) Impulse noise (D) Transit-time noise
49. One of the following is not a useful quantity for comparing the noise performance of receivers :
(A) Input noise voltage (B) Equivalent noise resistance
(C) Noise temperature (D) Noise figures
(A) HF mixers are generally noiser than HF amplifiers
(B) Impulse noise voltage is independent of bandwidth
(C) Thermal noise is independent of the frequency at which it is measured
(D) Industrial noise is usually of the impulse type
- o O o -
D 8807 16
Signature and Name of Invigilator
I. (Signature)_
Roll No.
(In figures as per admission card)
(Name)_
Roll No..
2. (Signature). (Name)2
(In words) Test Booklet No.
D-8807
Time : 2V2 hours]
[Maximum Marks : 200
PAPER III
ELECTRONIC SCIENCE
Number of Questions in this Booklet : 26
Number of Pages in this Booklet : 32
|
Instructions for the Candidates Write your roll number in the space provided on the top of this page. Answers to short answer/essay type questions are to be given in the space provided below each question or after the questions in the Test Booklet itself. 2. No Additional Sheets are to be used. At the commencement of examination, the question booklet will be given to you. In the first S minutes, you are requested to open the booklet and compulsorily examine it as below : 3. (i) To have access to the Test Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of S minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given. Read instructions given inside carefully. 4. 5. 6. One page is attached for Rough Work at the end of the booklet before the Evaluation Sheet. If you write your name or put any mark on any part of the Answer Sheet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification. 7. You have to return the Test booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. 8. Use only Blue/Black Ball point pen. 9. Use of any calculator or log table etc. is prohibited. 10. There is NO negative marking. |
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ELECTRONIC SCIENCE
PAPER III
NOTE:
This paper is of two hundred (200) marks containing four (4) sections. Candidates are required to attempt the questions contained in these sections according to the detailed instructions given therein.
Note : This section contains five (5) questions based on the following paragraph. Each question should be answered in about thirty (30) words and each carries five (5) marks.
Integrated circuits are classified as either linear or digital, referring to the two broad categories of applications for which they may be designed. Linear integrated circuits are those whose components are operated in the linear or active regions of their characteristics such as amplifiers. These circuits are said to be analog or continuous in nature, because voltages and currents can vary through a continuous range of possible values. Applications include audio and high-frequency amplifiers, operational amplifiers, modulators, oscillators, voltage regulators and power amplifiers. Digital integrated circuits are those whose components are used in logic and switching circuits. The devices in digital ICs are operated so that they switch rapidly between only two possible outputs, typically saturation and cut-off. They are used in computer logic circuitry, computer memories, and digital communication systems.
I. List out different steps for fabrication of integrated circuits.
3. Explain the operating principle of any LSI digital IC logic family.
5. Define the characteristics of ideal operational amplifier.
Note : This section contains fifteen (15) questions each to be answered in about thirty (30) words. Each question carries five (5) marks.
6. Draw the bridge rectifier circuit and define the term "ripple factor".
8. What are the advantages and disadvantages of frequency response analysis ?
10. Discuss the superiority of FETs over BJTs.
12. Draw the equivalent circuit and explain the working principle of SCR.
14. What are the advantages of PPM over PAM ?
16. With the help of schematic diagram, describe the working principle of Magnetron.
18. In what way is the graded-index fiber better than the multimode step-index fiber ? Define the normalized frequency for an optical fiber and explain its use in the determination of number of guided modes propagating within a step-index fiber.
20. Discuss open-loop and close-loop control system.
Note : This section contains five (5) questions. Each question carries twelve
(12) marks and is to be answered in about two hundred (200) words.
21. Explain pinch-off effect for JFET. Write an equation relating VGS to Vp for a JFET.
22. What do you mean by Phase Lock Loop (PLL) ? Explain free running frequency, capture range and locking range.
23. (a) Use an op-amp to be connected as
(i) Differentiating circuit
(ii) Summer
(b) Define the following :
(i) CMRR
(ii) Bandwidth
(iii) Open-Loop and closed loop gain of op-amp
24. Describe the step by step procedure to draw Bode plot ?
25. What do you mean by spontaneous emission and stimulated emission ? Why LASER shows high degree of coherence ?
Note : This section consists of one essay type question of forty (40) marks to be answered in about one thousand (1000) words on any of the following topics.
26. (a) Explain zener diode and draw its I - V characteristics.
(b) Draw the necessary diagram and explain the functioning of Maximum Power Transfer theorem.
(c) Explain in detail the working of band pass filter.
(d) What do you mean by multivibrator ? With a neat diagram, explain the operation principle of bistable multivibrator.
(a) Explain the principle of PIN photodiode and how it is used as an optical detector in fiber optic communication.
(b) With a neat diagram, explain the operation of C.R.O. Give three applications.
(c) Draw the architecture of 8085 microprocessor and explain its working.
(d) Discuss the operation of PID controller.
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