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

6

16

24

None of these

2. 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

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

Shaft

Effective

Slip

Synchronous

4. 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

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

Rotor

Stator

Armature

Field

6. The rotating part of a single - phase motor is called

Rotor

Stator

Running winding

Starting winding

7. If supply voltage in the above case is 110v, the voltage rating of the capacitor should be _ volt

2750

550

22

220

8. A 4 - pole induction motor is fed from a 50 hz source and is running at a slip of 4%. The speed of the motor is _ rpm

1500

1440

1560

1620

9. Out of the following methods of starting a 3-phase induction motor, which one requires six stator terminals?

Star- delta

Rotor rheostar

Autotransformer

Direct - on - line

10. Under no- load conditions power factor of an induction motor is about

0.2 lag

0.9 lag

Unity

0.5 lead