1
State Ohm's law and its limitations.

2 M

2
Define the principle of moving iron instrument for attraction type.

2 M

3
Calculate the e.m.f generated by a 4-pole, wave-wound armature having 45 slots with 18 conductors per slot when driven at 1200 r.p.m. and the flux per pole is 0.016 Wb.

2 M

4
List out the types of single phase induction motors.

2 M

5
Define the two breakdown conditions in Zener diode.

2 M

6
Find the values of I

_{C}, I_{B}and ?. Transistor values are a=0.95, I_{E}=1 mA.
2 M

7
Define the logic operation of AND gate with Boolean equation.

2 M

8
Prove the following Boolean identity.

A+AB=A+B

A+AB=A+B

2 M

9
Compare analog and digital signals.

2 M

10
What are the advantages of Optical Fibre Communication?

2 M

Answer any one question from Q11 (a) & Q11 (b)

11 (a) (i)
Determine the current, power in the 4? resistance of the circuit shown below.

10 M

11 (a) (ii)
RL series circuits having a resistance of 6? and an inductance of 0.03H is connected across a 100 V, 50 Hz Supply. Calculate the phase angle between the current and the voltage, power factor

6 M

11 (b) (i)
A 15 volt moving-iron volmeter has a resistance of 500 ? and an inductance of 0.12 H. Assuming that this instrument. Reads correctly on DC. What will be its reading on AC at 15 volts when the frequency

(1) 25 Hz and

(2) 100 Hz.

(1) 25 Hz and

(2) 100 Hz.

6 M

11 (b) (ii)
Explain the principle and operation of dynamometer type Watt meter and derive deflecting torque. Write advantages and disadvantages.

10 M

Answer any one question from Q12 (a) & Q12 (b)

12 (a) (i)
With neat sketchs, explain the working principle and the construction of DC motor. Also derive the Torque and speed equation.

12 M

12 (a) (ii)
A d.c. shunt generator supplies a load of 7.5 KW at 200 V. Calculate the induced e.m.f if armature resistance is 0.6 ? and field resistance is 80?

4 M

12 (b) (i)
At starting the windings of a 230 V, 50 Hz, split-phase induction motor main winding: R=4?, X

(1) Current I

(2) Current I

(3) Phase angle between I

(4) Line current

(5) Power factor of the motor

_{L}=7.5 ? and them starting winding R=7.5?, X_{L}=4?. Find(1) Current I

_{M}in the main winding(2) Current I

_{S}in the starting winding(3) Phase angle between I

_{S}and I_{M}(4) Line current

(5) Power factor of the motor

10 M

12 (b) (ii)
Explain the principle and working of single phase transformer.

6 M

Answer any one question from Q13 (a) & Q13 (b)

13 (a) (i)
Describe the working of PN junction diode in forward and reverse bias condition.

10 M

13 (a) (ii)
Explain the operation of NPN and PNP transistor.

6 M

13 (b) (i)
Let V

(1) I

(2) I

(3) I

(4) V

_{BB}=10V, R_{B}=1M, ?=100, V_{CC}=15, R_{L}=10? in the transistor circuit, find(1) I

_{B}(2) I

_{C}(3) I

_{E}(4) V

_{CE}, Neglect V_{BE}
8 M

13 (b) (ii)
Explain the working of Zener diode and its applications.

8 M

Answer any one question from Q14 (a) & Q14 (b)

14 (a) (i)
Draw the logic symbol of OR, AND, NOT gate and explain its logic operation.

8 M

14 (a) (ii)
Draw a half adder using gates. Explain with truth table with expression of sum and carry.

8 M

14 (b) (i)
Explain the operation and draw the following flip-flops,

(1) RS flip-flops using NOR gate

(2) D flip-flop using NAND gate

(3) JK flip flops.

(1) RS flip-flops using NOR gate

(2) D flip-flop using NAND gate

(3) JK flip flops.

12 M

14 (b) (ii)
Explain the operation of synchronous counters.

4 M

Answer any one question from Q15 (a) & Q15 (b)

15 (a) (i)
Describe the principle of modulation and its needs. Short note on amplitude modulation and frequency modulation.

12 M

15 (a) (ii)
Give some adavantages of FM over AM.

4 M

15 (b) (i)
With help of block diagram describe the working of a satellite (earth station transmitter) communication and its short note on earth station receiver.

12 M

15 (b) (ii)
Explain the operation of monochrome TV transmitter.

4 M

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