Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part2 : 6 to 10
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.In a three-phase induction motor, the number of poles in the rotor winding is always |
| zero |
| more than the number of poles in stator |
| less than number of poles in stator |
| equal to number of poles in stator |
7.The 'cogging' of an induction motor can be avoided by |
| proper ventilation |
| using DOL starter |
| auto-transformer starter |
| having number of rotor slots more or less than the number of stator slots (not equal) |
8.The maximum torque in an induction motor depends on |
| frequency |
| rotor inductive reactance |
| square of supply voltage |
| all of the above |
9.Rotor rheostat control method of speed control is used for |
| squirrel-cage induction motors only |
| slip ring induction motors only |
| both (a) and (b) |
| none of the above |
10.A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor |
| will continue running burning its one phase |
| will continue running burning its two phase |
| will stop and carry heavy current causing permanent damage to its winding |
| will continue running without any harm to the winding |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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