Electrical Engineering Questions And Answers :: Polyphase Induction Motors: part1

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Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part1 : 1 to 5

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2014 and IES 2014 examinations :

1.The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type

star connected only
delta connected only
(a) and (b) both
none of the above

2.A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be

200 Hz
50 Hz
2 Hz
0.2 Hz

3.The shaft of an induction motor is made of

high speed steel
stainless steel
carbon steel
cast iron

4.The number of slip rings on a squirrel cage induction motor is usually

two
three
four
none

5.In case the air gap in an induction motor is increased

the magnetising current of the rotor will decrease
the power factor will decrease
speed of motor will increase
the windage losses will increase

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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