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Three Phase Induction Motors

Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Squirrel cage induction motor
Both (A) and (B)
Slip ring induction motor
None of these

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Supply frequency
Phase sequence of supply voltage
Magnitude of supply voltage
Number of poles

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

2 poles
6 poles
8 poles
4 poles

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are decreased
None of the listed here
No load current is decreased
Leakage reactances are increased

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

None of the listed here
Four times
Equal to
Two times

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Bronze
Cast iron
Aluminium
Silicon steel

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