AC THREE PHASE MOTOR - Quiz

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

2) Where the panel boards are used?

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

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

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

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