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Three Phase Induction Motors

Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1/S
S/1-S
1-S
S

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

8 poles
2 poles
4 poles
6 poles

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

Rotor emf
Rotor current
Shaft diameter
Rotor power factor

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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 _____

1200 rpm
600 rpm
1000 rpm
300 rpm

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

None of the listed here
Provides high starting torque
Has simple and rugged construction
Provides fine speed control

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Low
Same as full load torque
Negligible
Slightly more than full load torque

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