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Three Phase Induction Motors

Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

S × rotor input
(1+S) × rotor input
(S-1) × rotor input
(1-S) × rotor input

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

1.5 %
2%
4%
Less than 1%

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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.

Two times
Equal to
None of the listed here
Four times

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor power factor
Shaft diameter
Rotor emf
Rotor current

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

0.05 Hz
1.5 Hz
2.5 Hz
5 Hz

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

6 poles
8 poles
2 poles
4 poles

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