Indira Gandhi National Open University (IGNOU) 2007 B.E Manufacturing Processes and Automation Engineering E-042: ELECTRONICS - Question Paper

Diploma in Electricel and Mechanical
Engineering
Term-End exam
June, 2OO7
BEE-042: ELECTRONICS
Time : two hours Maximum Morks : 70
Note 3
(i) Quesf ion no. seven is computsory.
(rr) ' Attempt any Iour ques. from the remaining
ques. nu mbered two to 8.
(iir) Use of -calculator is permitted.
1. choose the accurate ans from the provided 4 options.
14x7:74
(i) In a semiconductor, the energy gap behpeen valence
band and conduction band is nearlY
(a) five eV
(b) one eV
(c) 3'5 eV
(d) 1'5 eV
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(ii) Semiconductor containing trivalent impurity is called
(a) P-type semiconductor
(b) N-type semiconductor
(c) N-P-N kind semiconductor
(d) P-N-P kind semiconductor
(iii) The noise margin of CMOS logic family is
(a) 0.4 V
( b ) 4v
(c) 10 V
(d) 0.2 v
(iv) If o : 0.98, Ico : six pA and IB : 100 pA for a
transistor, then the value of Ia is
(a) 2.3 mA
(b) 3.1 mA
(c) 4.6 mA
(d) 5'2 mA
(v) In standard TTL, the 'TOTEM POLE' stage refers to
(a) Phase splitter
(b) The multi emitter input stage
(c) Output buffer
(d) Open collector output stage
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(vii)
(d) The gate whose output is low if and only if all the
(A) NAND
(b) NoR
(c) oR
(d) AND
Which of the subsequent use lowest power ?
(a) TTL
(b) ECL
(c) CMOS
(d) All of the above
(viii) output of schmitt trigger is wave.
(a) Sine
(b) Rectangle
'(c)
Square
(d) Trapezoidal
(ix) The negative logic AND gate can be repr€sented by
a positive logic _ gate.
(a) AND
(b) oR
(c) NAND
(d) NOR
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(x) C.R.O. cqnnot be used for the measurement of
(a) Frequency
(b) Power
(c) Voltage
(d) Current
In the block diagram of power supply,
block is used in ranging from transformer and
(a) Regulator
(b) Rectifier
(c) Power supply
(d) Load
filter.
(xii) Output impedance of emitter follower is
(a) Very high
(b) Very low
(c) Zero
(d) Infinite
(xiii) The study of the properties of air ' water vapour
mixture is called
(a) Dew point
(b) Psychrometrics
(c) Flow meter
(d) Pyrometer
(xi)
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2.
(xrv) Power dissipation of TTL logic family is
(a) five mW
( b ) 1mW
(c) 10 mW
(d) 100 mW
(a) Compare CC, CE and CB configurations.
(b) A 470 pF capacitor has 10 V dc across it with a
terminal load resistance of five kC). If the full wave
rectifier has supply voltage 230 V and supply
frequency is 50 Hz, what is the percentage of ripple
in the output ?
A full wave rectifier uses a diode with forward resistance
of 10 O. The transformer secondary is center tapped
with output 10 - 0 - 10 Vr*, and has resistance of five O
of ,each half part. compute (a) No load dc voltage
(b} DC output voltage at 100 mA (c) Vo Regulation at
100 mA (d) Efficiency (e) Ripple voltage across load (f) PIV
of every diode.
discuss in detail mechanism of zener diode. In what
way is a zener diode various from general diode ?
discuss the transistor action as an amplifier
Draw and discuss the working of digital frequency
meter with the help of a block diagram.
define transducers with their classification.
10
3,
4. (a)
tb)
5. (a)
(b).
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14
8
6
7
7
P.T.O.
6. (a) discuss universal gates. Illustrate NOT, OR and AND
gates using universal gates. 7
7 (b) define the classification of instruments.
7. (a) discuss the different components of CRO with a neat
. functional block diagram. 7
(b) With a block diagram, discuss the working of a T.V.
receiver. 7
8. Write short notes on any 4 of the subsequent : 48
+
(a) JFET and its application
(b) Working of UPS
(c) Pneumatic sensors
(d) Linear Actuators
(e) Strip Chart Recorder
(f) Measurement of thickness
B EE-042 1,000

Earning:   Approval pending.