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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
The advantage of wound rotor motor is that _______

It requires less maintenance
External resistance can be inserted in the rotor circuit
It is inexpensive
None of the listed here

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

Series
Slip ring
Synchronous
Commutator

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test
All of these
Stator resistance test
Blocked rotor test

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Three Phase Induction Motors
The rotor of an induction motor runs at

Synchronous speed
Above synchronous speed
Any of the above
Below synchronous speed

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Low
Slightly more than full load torque
Negligible

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