Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part3 : 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.In case of 3-phase induction motors, plugging means |
| pulling the motor directly on line without a starter |
| locking of rotor due to harmonics |
| starting the motor on load which is more than the rated load |
| interchanging two supply phases for quick stopping |
2.In a three-phase induction motor |
| power factor at starting is high as compared to that while running |
| power factor at starting is low as compared to that while running |
| power factor at starting in the same as that while running |
| power factor at starting is low as compared to that while running |
3.Blocked rotor test on induction motors is used to find out |
| leakage reactance |
| power factor on short circuit |
| short-circuit current under rated voltage |
| all of the above |
4.A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be |
| 0.01 |
| 0.02 |
| 0.03 |
| 0.04 |
5.The torque of a rotor in an induction motor under running condition is maximum |
| at the unit value of slip |
| at the zero value of slip |
| at the value of the slip which makes rotor reactance per phase equal to the resistance per phase |
| at the value of the slip which makes the rotor reactance half of the rotor |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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