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THREE PHASE INDUCTION MOTORS

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

Shaft
Bearings
Stator core
None of these

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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
The torque developed in the cage induction motor with auto-starter is

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

High speed steel
Cast iron
Carbon steel
Stainless steel

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