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Three Phase Induction Motors

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

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

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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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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will burn
The motor will not run
The motor will run at reduced speed

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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 ______

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

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

50 Hz
25 Hz
None of the listed here
60 Hz

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

High reactance
high resistance
Large slip
Low resistance

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