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Three Phase Induction Motors

Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Small
Practically zero
None of the listed here
Large

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

More than
Less than
None of the listed here
About the same

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Three Phase Induction Motors
The shaft of an induction motor is made of

Cast iron
High speed steel
Stainless steel
Carbon steel

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

95 to 98 %
80 to 90%
99%
60 to 90%

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased four times
Increased two times
Decreased four times
Decreased two times

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

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

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