(a) Reducing the steepness of waveform
(b) Reducing the current of waveform
(c) Reducing the voltage of waveform
(d) Modify the shape of the waveform
Ans. (a) Reducing the steepness of waveform
Q.2. Switching over voltages are more hazards than lightning surges in case of
(a) Low-voltage system
(b) 33 KV system
(c) EHV and UHV system
(d) All of the above
Ans. (c) EHV and UHV system
Q.3. The over voltage surge in power systems may be caused by
(a) Lightning
(b) Resonance
(c) Switching
(d) All of the above
Ans. (d) All of the above
Q.4. In a sub-station the following equipment is not installed
(a) Exciters
(b) Series capacitor
(c) Shunt reactors
(d) Voltage transformers
Ans. (a) Exciters
Q.5. With which of the following are step-up sub-stations associated?
(a) Concentrated load
(b) Consumer location
(c) Distributor
(d) Generating stations
Ans. (d) Generating stations
Q.6. Which of the following equipment is used to limit short circuit level in a sub-station?
(a) Isolator
(b) Lightning switch
(c) Coupling capacitor
(d) Series reactor
Ans. (d) Series reactor
Q.7. Most of the sub-stations in the power system change ...... of electric supply.
(a) Current level
(b) Voltage level
(c) Both A and B
(d) None of the above
Ans. (b) Voltage level
Q.8. An ideal location for the sub-station would be at the ...... of load.
(a) Center of gravity
(b) Load center
(c) Nearer to consumer
(d) None of the above
Ans. (a) Center of gravity
Q.9. Outdoor sub-station require ...... space
(a) Less
(b) Medium
(c) More
(d) Any of the above
Ans. (c) More
Q.10. Majority of distribution sub-stations are of ...... type.
(a) Pole mounted
(b) Outdoor
(c) Indoor
(d) All of the above
Ans. (b) Outdoor
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