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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Rotating
Alternating
None of the listed here
Steady

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

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

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

All of these
Stator resistance test
No-load test
Blocked rotor test

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

The same phase as the rotor e.m.f.
High value for the satisfactory speed control
The same frequency as the slip frequency
Zero frequency

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