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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Aluminium
Phospor bronze
Carbon

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Three
Two
One
Four

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

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

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

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

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

Starting
Full load
No load
Half full load

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MORE MCQ ON Three Phase Induction Motors

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