King Georges Medical University 2009 B.E Electrical and Electronics Engineering Basic electrical and electronics - Question Paper

EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
KINGS
COLLEGE OF ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
ques. BANK
SUBJECT CODE & NAME : EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
YEAR / SEM : I / II
UNIT – I
ELECTRIC CIRCUITS AND MEASUREMENTS
PART – A (2 MARKS)
1. State Ohm’s legal regulations and its limitations.
2. State Kirchhoff’s legal regulations.
3. Derive the formula for equivalent resistance of number of resistors connected in
parallel.
4. What is meant by electric energy?
5. Distinguish ranging from power and energy.
6. elaborate lumped circuits?
7. What is meant by electric power? provide various forms of expression for electric power.
8. Draw power triangle.
9. describe time period and frequency of an alternating volume.
10. discuss the terms (a) instantaneous value and (b) avg. value for an ac signal.
11. Draw sinusoidal, saw tooth and half- rectified sinusoidal waveforms.
12. describe form factor and peak factor.
13. describe power factor.
14. provide the advantages of phase system.
15. Distinguish ranging from apparent power and actual power.
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
16. Mention the two kinds of wattmeter.
17. Name the coils in the wattmeter.
18. elaborate the advantages and disadvantages of MI instruments?
19. List out the measuring instruments you know.
20. How an ammeter and voltmeter are connected in a circuit? Why?
PART – B
1. (i) State and discuss Kirchoff’s legal regulations. (8)
(ii)Explain the working of a Dynamometer wattmeter with a neat sketch.
(8)
2. describe (i) RMS Value (16)
(ii)Average Value
(iii)Instantaneous Value
(iv)Real power
(v)Apparent power
(vi)Reactive power
(vii)Frequency
(viii)Balanced 3 phase circuit
3. Name the instrument used for measuring the electrical power consumed during a
specific period. explain its principle of operation with suitable diagram. (16)
4. (i)A series circuit has R=10Ù, L=50mH, and C=100ìF and is supplied with 200V,
50Hz. obtain (i) Impedance (ii) current (iii) power (iv) power factor (v) voltage drop
across the every element. (8)
5.
(ii)Derive the formula for equivalent resistance of number of resistors connected in
parallel. (8)
6. Illustrate with a neat diagram, the construction and operation of a permanent magnet
moving coil. How could it be replaced for use as (i) ammeter (ii) voltmeter (16)
7. 400V is applied to 3 star connected identical impedances every consisting of a 40
Ù resistance in series with three Ù inductance reactance. obtain (i) line current (ii) Total
power supplied (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
8. obtain the current through every branch by network reduction technique. (16)
9. compute a) the equivalent resistances across the terminals of the supply, b) total
current supplied by the source and c) power delivered to 16 ohm resistor in the circuit
shown in figure. (16)
10. In the circuit shown, determine the current through the two ohm resistor and the total
current delivered by the battery. Use Kirchhoff’s laws. (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
11. (i) Determine the current through 800 ohm resistor in the network shown in
figure. (8)
(ii) obtain the power dissipated in 10 ohm resistor for the circuit shown in figure. (8)
11. (i) In the network shown below, obtain the current delivered by the battery. (10)
(ii) explain about voltage and current division principles. (6)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
12.Find the current through branch a-b using mesh analysis shown in figure beneath.
(8)
13.Find the nodal voltages in the circuit of figure. (16)
14.Using Mesh analysis, obtain current through four ohm resistor. (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
UNIT – II
ELECTRICAL MACHINES
PART – A (2 MARKS)
1. What is the basic principle of a dc generator?
2. elaborate the basic parts of a dc generator?
3. What is the purpose of yoke in a dc machine?
4. Mention the two kinds of armature winding in a dc machine.
5. What is the function of commutator in a dc generator?
6. Write down the emf formula of a dc generator.
7. elaborate the various kinds of dc generators?
8. Draw the circuit diagram of any 2 kinds of DC generators.
9. What is the material used for armature core, field winding, commutator amd brushes?
10. List out the various kinds of DC motor.
11. Why is a shunt motor called constant speed drive?
12. describe the term “speed regulation” of a DC motor.
13. Write down the torque formula of a DC motor.
14. provide the significance of back emf in a dc motor.
15. describe transformation ratio.
16. describe voltage regulation of a transformer.
17. elaborate the kinds of transformers based on construction?
18. elaborate the various kinds of single phase induction motor?
19. elaborate the applications and characteristics of capacitor-start capacitor run motor?
20. elaborate the classifications of single phase induction motor based on the method of
starting?
21. Draw the circuit diagram of any 1 kind of 1-phase induction motor.
22. Name the motors used in ceiling fan and in lathes.
23. Which kind of single phase induction motor is to be opted for driving fans and
blowers and why?
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
PART – B
1. discuss the principle of operation of a DC generator and derive the emf formula. explain
in detail about the construction of DC generator with the neat sketch. (16)
2. Derive the formula for induced emf of a DC machine. (16)
3. provide the significance of back emf in a DC motor. (16)
4. Derive the torque formula of DC motor. (16)
5. define the construction details of transformer and also discuss the principle of
operation. (16)
6. discuss the principle of operation of single phase 2-winding transformer. (16)
7. Derive the emf formula of a transformer. (16)
8. discuss the principle of operation of single phase induction motor. (16)
9. discuss double field revolving theory. (16)
10.What are the classifications of single phase induction motor based on the
method of starting? (16)
11. A transformer with 40 turns on the high voltage winding is used to step
down the voltage from 240V to 120V. obtain the number of turns in the low
voltage winding. (16)
12.A four pole, wave wound generator having 40 slots and 10 conductors placed
per slot. The flux per pole is 0.02 wb. compute the generated emf when
the generator is drive at 1200 rpm. (16)
13.A 25kw, 250V, dc shunt generator has armature and field resistances of
0.06ohm and 100ohm respectively. Determine the total armature power
developed when working (1) as a generator delivering 25 kw output and
(2) as a motor taking 25kw. (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
UNIT – III
SEMICONDUCTOR DEVICES AND APPLICATIONS
PART – A (2 MARKS)
1. describe electron volt.
2. describe (a) intrinsic semiconductor and (b) extrinsic semiconductor.
3. What is meant by doping in a semiconductor?
4. elaborate majority and minority carriers in a semiconductor?
5. elaborate the kinds of solids based on energy band theory? provide examples for every.
6. provide the energy band description of conductors, semiconductors and insulators.
7. Draw the energy band diagram for an insulating material.
8. What is a zener diode?
9. describe break down voltage in zener diode.
10. How does a PN junction behave under forward and reverse biased condition?
11. Differentiate Avalanche breakdown and zener breakdown.
12. What do you mean by ripple factor?
13. describe peak inverse voltage.
14. What is the peak inverse voltage of centre tapped full wave rectifier?
15. elaborate the advantages and disadvantages of full wave rectifier?
16. Draw the symbol of npn and pnp transistor.
17. Compare the 3 transistor configuration with regard to input and output resistance,
current and voltage gain.
18. compute IE in a transistor for which â=50 and IB=20ìA.
19. Why transistor is called current controlled device?
20. elaborate the various configurations of BJT?
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
PART – B
1. discuss intrinsic and extrinsic semiconductors with neat diagrams. (16)
2. define the working of a PN junction diode with neat diagrams. Also discuss its V-I
characteristics. (16)
3. discuss how a PN junction is formed and state its properties under no bias, forward
bias and reverse bias condition. (16)
4. What is a Zener diode? discuss the operation of Zener diode and draw its
characteristics. (16)
5. discuss the operation of halfwave rectifier with neat sketch. (16)
6. discuss the operation of centre tapped fullwave rectifier with neat diagram. (16)
7. Derive an expression for efficiency of a half-wave rectifier. (16)
8. discuss with a neat diagram how the input and output characteristics of a CE
configuration can be found. (16)
9. Compare the input resistance, output resistance and voltage gain of CB, CC and CE
configuration. (16)
10.Explain the working of the CB configuration of a BJT. (16)
11.Explain in detail about small signal CE amplifier. (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
UNIT – IV
DIGITALS ELECTRONICS
PART – A (2 MARKS)
1. Represent the decimal number 13910 into a binary number.
2. State Demorgan’s theorem
3. Draw the logic symbol and truth table of EX-OR gate.
4. elaborate universal gates? Why?
5. What is a filp-flop? Where it is used?
6. elaborate the various kinds of flip-flops?
7. What is meant by racing in the operation of a flip-flop?
8. State a method to avoid racing issue in JK flip-flop.
9. Mention the kinds of digital to analog converters.
10. provide the logic diagram and truth table of D flip-flop.
11. elaborate the various kinds of counters?
12. elaborate shift registers?
13. Draw the symbol and truth table of NAND gate.
14. Draw the symbol and truth table of AND gate.
15. Draw the symbol and truth table of NOR gate.
16. Draw the equivalent circuit of NOT gate.
17. Add binary number 1011 and 1110, and write the ans.
18. Convert 1610 into a binary number.
19. Convert the subsequent numbers to decimals. (a) 2378 (b) 23F16
20. discuss the radix of a number system.
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
PART – B
1. Draw and discuss the operation of AND, OR, NOT, NAND and NOR gates with suitable
truth table. (16)
2. How to get NOR from NOT and OR. Also provide the truth table for NOR. (16)
3. elaborate universal gates? discuss their principle of working with
necessary truth table. (16)
4. Design half adder and full adder. (16)
5. Design a full adder and implement it using logic gates. (16)
6. Write short notes on: (16)
a. RS-flip flop
b. D-flip flop
c. JK -flip flop
d. T-flip flop
e. JK-master slave flip flop
7. Briefly discuss the working of JK flip flop. (16)
8. discuss the operation of different kinds of shift register. (16)
9. discuss in details about Analog Digital and Digital to Analog conversion. (16)
10. discuss the operation of RS flip-flop with logic diagram and truth table. (16)
11. With necessary diagrams discuss the functioning of any 1 kind of the following: (16)
a. Decade counter b. D/A converter
12. What is a counter? explain briefly about Mod-5 counter. (16)
13. With necessary diagrams discuss the functioning of any 1 kind of A/D converter. (16)
14. Show that NAND and NOR gates are universal building blocks. (16)
15. define the operation of a 4-bit binary, ripple counter. (16)
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
UNIT – V
FUNDAMENTALS OF COMMUNICATION ENGINEERING
PART – A (2 MARKS)
1. describe Communication.
2. What is an antenna?
3. describe analog signal.
4. describe digital signal.
5. What is the difference ranging from analog signal and digital signal?
6. What is meant by modulation and demodulation?
7. elaborate the kinds of modulation?
8. Compare amplitude modulation and frequency modulation.
9. What is meant by sampling?
10. Why are AM systems preferred in broadcasting than FM systems?
11. elaborate the different standards used in TV transmission systems?
12. elaborate the advantages of optical fiber communication?
13. What is packet loss?
14. Write briefly on principle of total internal reflection used in fibre optics.
15. What is interlaced scanning?
16. What is meant by signal to noise ratio and noise figure of a receiver?
17. What is meant by Amplitude shift keying?
18. What is bandwidth for AM wave?
19. What is meant by modulation index for AM wave?
20. What is meant by radio transmitter?
EE1152 – BASIC ELECTRICAL & ELECTRONICS ENGINEERING
KINGS COLLEGE OF ENGINEERING, PUNALKULAM
PART – B
1. Draw the basic diagram of a wireless communication system and discuss. (16)
2. What is meant by modulation? discuss various kinds of modulation techniques with
neat diagrams. (16)
3. What is meant by amplitude modulation? discuss. provide AM wave formula spectrum
of AM wave. (16)
4. discuss pulse code modulation and show different coding techniques. (16)
5. discuss with neat block diagrams, the principle and working of AM and
FM transmitter. (16)
6. elaborate the characteristics of a radio receiver? discuss any 1 radio receiver with a
neat diagram. (16)
7. discuss the working of TV transmitter and receiver. (16)
8. discuss satellite communication system. (16)
9. discuss in details about FAX. (16)
10. Draw the block diagram of optical fibre communication system and discuss it. (16)
11. discuss in detail about microwave communication system. (16)
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