PSU Sample Paper 3
1 Which of the following is not true for common collector amplifier?
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- It offers high input impedance. b) It offers low output impedance.
- It offers wide band width. d) It offers a large gain.
2. Which of the following is not true with respect to negative feedback?
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- It increases gain. b) It improves distortion.
c) It improves signal to noise ratio. d) It improves bandwidth.
3.If the conduction in the anode circuit takes place for less than 180o of the input cycle, the amplifier is classified as:
a) Class A b) Class B c) Class C d) Class D
4. The following network will act as a
a) Low pass filter b) High pass filter
c) Band pass filter d) Band stop filter
5. In Satellite Broadcasting, the down link frequency in C band range is
a) 2.5 GHz to 2.7 GHz b) 3.7 GHz to 4.2 GHz
c) 4.5 GHz to 4.8 GHz d) 11.7 GHz to 12.2 GHz
6. In a 100 kW AM transmitter, if the carrier is modulated with 100% modulation index, power in the lower side band will be:
a) 100 kW b) 50 kW c) 25 kW d) 12.5 kW
7. The ratio of reflected power to incident power is
a) Reflection Co-efficient b) (Reflection Co-efficient)2
c) VSWR d) (VSWR)2
8. The equation relating VSWR with reflection coefficient is
a) 
b) 
c) 
d) 
9. The amount of pre-emphasis given to the audio signal in AIR in FM broadcasting is
a) 25 msec. b) 50 m sec c) 75 m sec. d) 100 m sec.
10. The characteristic impedance of free space is
a) 50 ohms b) 120 ohm c) 377 ohms d) 440 ohms
11. Which of the following is not expressed in watt?
a) V2/R b) I2R c) VxI d) V/I
12. 4 mF is same as
a) 0.004 nF b) 40 nF c) 400 nF d) 4000 nF
13. An electronic fan regulator
a) is a current divider b) voltage divider
c) varies angle of conduction of ac wave d) None of the above
14 An ammeter has 1 A range and has a resistance of 10 W. To measure 10 A current with this meter, we shall use a resistance
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- more than 10 ohms in series b) less than 10 ohms in series
c) more than 10 ohms in parallel d) less than 10 ohms in parallel
15. Which of the following acts as an open circuit to d.c?
a) Diode b) Inductor c) Capacitor d) All the above
Answers: PSU Sample Question Paper 3
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. Fill in the blanks:
- Secondary of a current transformer should never be ____________.
- ____________.
- The equipment required for maintenance of a wet battery is ____________.
- All electrical installations should be tested for good insulation at least once every __________.
- Stock of Carbon Tetrachloride should be maintained in ______________ register.
- The refrigerant in an a.c. plant gets converted from gaseous state to liquid state in the ____________.
- When a circuit breaker is drawn out of the rack, the connection spout shutters should be ____________.
- ……………………………..
- A scientific tool for monitoring the progress of a Project is ____________.
- Spurious power emitted by transmitters can be judged with the help of a ____________.
Answers:
1. Open Circuited 2. ………………… 3. Hydrometer
4. Six months 5. S150 6. Condensor
7. ………………… 8. 48 9. PERT Chart
10. Spectrum Analyzer