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Three Phase Induction Motors

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

0
1
0.1
0.5

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(S-1) × rotor input
(1+S) × rotor input
S × rotor input
(1-S) × rotor input

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

20 to 30 %
2 to 5 %
10 to 20 %
None of the listed here

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

Very large
1
As small as possible
Large

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

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

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

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

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