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Three Phase Induction Motors

Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
None of these
Copper losses in motor
Supply voltage

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Full load
Starting
No load
Half full load

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Infinity
Absent
Large
Small

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

Hollow
Flexible
Any of the listed here
Stiff

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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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Three Phase Induction Motors
Slip rings are usually made of

Copper
Phospor bronze
Aluminium
Carbon

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