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Three Phase Induction Motors

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

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

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

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Three Phase Induction Motors
The shaft of an induction motor is made of

Cast iron
Carbon steel
High speed steel
Stainless steel

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Increases the rotor current
Rotor current becomes zero
Decreases the rotor current
Rotor current remains same

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run at reduced speed
The motor will burn
The motor will not run
The motor will run in reverse direction

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Two
Four
Three
One

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