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Three Phase Induction Motors

Three Phase Induction Motors
The frame of an induction motor is usually made of

Silicon steel
Cast iron
Aluminium
Bronze

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Magnitude of supply voltage
Number of poles
Phase sequence of supply voltage
Supply frequency

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

1200 rpm
1000 rpm
300 rpm
600 rpm

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

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

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz
50 Hz
25 Hz
None of the listed here

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
0.2
1
Practically zero

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