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Three Phase Induction Motors

Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

65%
None of the listed here
40%
90%

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Greater mechanical strength
Less rotor losses
None of the listed here
Uniform torque

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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 _____

300 rpm
600 rpm
1000 rpm
1200 rpm

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Using DOL starter
Proper ventilation
Having number of rotor slots more or less than the number of stator slots
Auto transformer starter

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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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Three Phase Induction Motors
The rotor of induction motor

None of the listed here
Always revolves in the direction opposite to stator flux
Always revolves in the direction of stator flux
Insufficient data

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