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THREE PHASE INDUCTION MOTORS

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

Bearings
None of these
Shaft
Stator core

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

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

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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
The shaft of an induction motor is made of

Cast iron
Stainless steel
Carbon steel
High speed steel

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