Electrical Engineering Questions and Answers

1. Name power losess in rotating electrical machines?

Power losess in rotating electrical machines are Copper losses, core losses, mechanical losses and stray losses.

2. Hysteresis motor is used in.......

Phonographic appliances

3. What is meant by armature reaction?

The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.

4. What is the difference between synchronous generator & asynchronous generator?

Synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing.

5. Where should the lighting arrestor be placed in distribution lines?

Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations.

6. What is encoder?

An encoder is a device used to change a signal (such as a bitstream) or data into a code.

7. Why the capacitors works on ac only?

Generally capacitor gives infinite resistance to dc components(i.e., block the dc components). it allows the ac components to pass through.

8. What is the function of anti-pumping in circuit breaker?

when breaker is close at one time by close push button,the anti pumping contactor prevent re close the breaker by close push button after if it already close

9. What does the KVAR means?

The KVAR indicates the electrical power. KVAR means “Kilo Volt Amperes with Reactive components

10. What is ACSR cable and where we use it?

ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.

11. Both have the same principle of electromagnetic induction, the only difference is that their construction. What i'm talking about?

Generator and alternator


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