1. The power factor of an alternator is determined by it’s

Speed

Load

Excitation

Prime mover

2. Unlike dc generator kw rating alternators are rated in

Kva

Kvar

Kwh

Mw

3. The pitch factor for 3rd harmonic in an alternator having 18 slots/ pole and coil span 5/6 of pole pitch is

0.707

0.259

0.966

1

4. Dampers in a large generator

Increase stability

Reduce voltage fluctuations

Reduce frequency fluctuations

None of above

5. A synchronous generator gives out put at the standard frequency. This frequency can be increase by

Increasing the field current

Increasing the speed of the armature

Increasing the speed of the field

Decreasing the field current

6. For turbo- alternators, the usual value of pole number is

6

16

24

None of these

7. Heavy duty steel works cranes which have wide load variations are equipped with_motor

Double squirrel cage

D.c series

Slip - ring induction

Cumulative compound

8. The speed with which magnetic field of an induction motor rotates is called _ speed

Shaft

Effective

Slip

Synchronous

9. One of the characteristics of a single- phase motor is that It

Is self -starting

Is not self- starting

Requires only one winding

Can rotate in one direction only

10. The starting winding of a single - phase motor is placed in

Rotor

Stator

Armature

Field