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Three Phase Induction Motors

Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor emf
Rotor current
Shaft diameter
Rotor power factor

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

Unity
0.5 leading
0.2 leading
0.2 lagging

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1600 rpm
1200 rpm
400 rpm
2400 rpm

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

730 rpm
1000 rpm
2880 rpm
1440 rpm

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Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Aluminium
Carbon
Copper

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

None of the listed here
inversely proportional to rotor reactance at standstill
Directly proportional to rotor resistance
Inveresly proportional to supply voltage

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