Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part4 : 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.In an induction motor if air-gap is increased |
| the power factor will be low |
| windage losses will be more |
| bearing friction will reduce |
| copper loss will reduce In an induction motor |
12.Insertion of reactance in the rotor circuit |
| reduces starting torque as well as maximum torque |
| increases starting torque as well as maximum torque |
| increases starting torque but maxi-mum torque remains unchanged |
| increases starting torque but maxi-mum torque decreases |
13.The torque developed by a 3-phase induction motor least depends on |
| rotor current |
| rotor power factor |
| rotor e.m.f. |
| shaft diameter |
14.Which motor is preferred for use in mines where explosive gases exist ? |
| Air motor |
| Induction motor |
| D.C. shunt motor |
| Synchronous motor |
15.Temperature of the stator winding of a three phase induction motor is obtained by |
| resistance rise method |
| thermometer method |
| embedded temperature method |
| all above methods |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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