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Three Phase Induction Motors

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

Stator core
None of these
Bearings
Shaft

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

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

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

Large
1
As small as possible
Very large

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0
0.1
0.5
1

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

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

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

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

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