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Three Phase Induction Motors

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

50 Hz
20 Hz
2 Hz
200 Hz

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Is decreased
None of the listed here
Is increased
Remains unchanged

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

It is inexpensive
None of the listed here
External resistance can be inserted in the rotor circuit
It requires less maintenance

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

4%
2%
Less than 1%
1.5 %

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

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S
1-S
1/S
S/1-S

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