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Three Phase Induction Motors

Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Synchronous
Series
Commutator

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

None of the listed here
Less rotor losses
Greater mechanical strength
Uniform torque

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

k2/torque with direct switching
k/torque with direct switching
K2 × torque with direct switching
K × torque with direct switching

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

Squirrel cage induction motor
None of the listed here
Both squirrel cage and slip ring
Slip ring induction motor

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

Four times
Equal to
None of the listed here
Two times

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