Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part2 : 16 to 20
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered |
| in series |
| in parallel |
| in series-parallel |
| in parallel with stator |
17.Slip ring motor is recommended where |
| speed control is required |
| frequent starting, stopping and reversing is required |
| high starting torque is needed |
| all above features are required |
18.The 'crawling" in an induction motor is caused by |
| high loads |
| low voltage supply |
| improper design of machine |
| harmonics developed in the motor |
19.It is advisable to avoid line-starting of induction motor and use starter because |
| motor takes five to seven times its full load current |
| it will pick-up very high speed and may go out of step |
| it will run in reverse direction |
| starting torque is very high |
20.Low voltage at motor terminals is due to |
| inadequate motor wiring |
| poorely regulated power supply |
| any one of the above |
| none of the above |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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