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Three Phase Induction Motors

Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Same
Any of the listed here
Bigger
Smaller

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

1
Practically zero
0.2
0.5

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1-S
1+S
S-1

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Square of supply voltage
Rotor inductive reactance
Frequency
All of the listed here

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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
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times
Decreased four times
Increased four times
Decreased two times

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