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Three Phase Induction Motors

Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.04 %
0.4 %
4 %
14%

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

Silicon steel
Cast iron
Bronze
Aluminium

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

None of the listed here
Increasing rotor reactance
Increasing rotor resistance
Decreasing rotor resistance

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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
None of the listed here
25 Hz
50 Hz

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

None of the listed here
Even number
Equal to stator poles
Prime number

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will not run
The motor will burn
The motor will run at reduced speed
The motor will run in reverse direction

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