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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
0.5
1
0

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

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

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

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

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

95 to 98 %
99%
80 to 90%
60 to 90%

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Both (A) and (B)
None of these
Slip ring induction motor
Squirrel cage induction motor

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

S × rotor input
(1-S) × rotor input
(1+S) × rotor input
None of the listed here

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