AC THREE PHASE MOTOR - Practice Mode

1) Which type of winding has more space for cooling?

Between overhanging coils Between overhanging coil and rotor Between overhanging coils and yoke Between overhanging coil and wedge

Correct Answer: Between overhanging coils and yoke

2) Where the panel boards are used?

Industrial motor drives Domestic wiring circuits 3 phase domestic wiring Load distribution for AC & DC supply

Correct Answer: 3 phase domestic wiring

3) Determine the torque in newton metres produced by a 7.5 HP squirrel cage motor rotating at 1440 rpm?

21.63 Nm 24.4 Nm 33.05 Nm 36.6 Nm

Correct Answer: 36.6 Nm

4) What is the purpose of using rotor resistance starter to start 3 phase slip ring induction motor?

Reduce rotor voltage Reduce rotor current Increase the torque Reduce the power loss

Correct Answer: Increase the torque

5) Which method of speed control is only applicable for 3 phase slipring induction motor?

Cascade operation method Rotor rheostat speed control Changing the applied frequency method Changing the number of stator poles method

Correct Answer: Rotor rheostat speed control

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