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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Greater mechanical strength
Less rotor losses
Uniform torque
None of the listed here

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Provides high starting torque
None of the listed here
Has simple and rugged construction
Provides fine speed control

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Parabola
Hyperbola
Rectangular parabola
Straight line

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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 _____

None of the listed here
50 Hz
25 Hz
60 Hz

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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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