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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
All of the listed here
Frequency
Rotor inductive reactance

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

Shaft diameter
Rotor emf
Rotor current
Rotor power factor

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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.

Four times
Two times
Equal to
None of the listed here

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

Stator core
Bearings
None of these
Shaft

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Aluminium
Carbon
Phospor bronze

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

1440 rpm
1000 rpm
730 rpm
2880 rpm

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