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 2024 and IES 2024 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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