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Three Phase Induction Motors

Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Square of supply voltage
All of the listed here
Rotor inductive reactance

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Three Phase Induction Motors
A 3 phase induction motor is ________

Not easily maintainable
Essentially a constant speed motor
A variable speed motor
Very costly

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz
None of the listed here
25 Hz
50 Hz

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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 _____

1000 rpm
300 rpm
600 rpm
1200 rpm

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Improper design of machine
High loads
Harmonics developed in the rotor
Low voltage supply

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

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

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