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Three Phase Induction Motors

Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Phospor bronze
Copper
Carbon

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Even number
None of the listed here
Prime number
Equal to stator poles

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor reactance
Increasing rotor resistance
None of the listed here
Decreasing rotor resistance

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing supply frequency
Changing winding resistance
Changing number of poles
Reducing supply voltage

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Three Phase Induction Motors
An induction motor is

Self starting with zero torque
Non self starting
Self starting with high torque
Self starting with low torque

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Self induction
Mutual induction
Eddy currents
Hysteresis

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