Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part1 : 11 to 15
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ? |
| By changing the number of stator poles |
| Rotor rheostat control |
| By operating two motors in cascade |
| By injecting e.m.f. in the rotor circuit |
12.The frame of an induction motor is usually made of |
| silicon steel |
| cast iron |
| aluminium |
| bronze |
13.An induction motor is identical to |
| D.C. compound motor |
| D.C. series motor |
| synchronous motor |
| asynchronous motor |
14.The injected e.m.f. in the rotor of induction motor must have |
| zero frequency |
| the same frequency as the slip fre-quency |
| the same phase as the rotor e.m.f. |
| high value for the satisfactory speed control |
15.The crawling in the induction motor is caused by |
| low voltage supply |
| high loads |
| harmonics develped in the motor |
| improper design of the machine |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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