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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
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

20 Hz
200 Hz
2 Hz
50 Hz

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

None of the listed here
Open circuited
Short circuited
Supplying a variable resistive load

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Has simple and rugged construction
Provides high starting torque
None of the listed here
Provides fine speed control

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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
None of the listed here
inversely proportional to rotor reactance at standstill

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

20 to 30 %
None of the listed here
2 to 5 %
10 to 20 %

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