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Three Phase Induction Motors

Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

None of the listed here
Steady
Alternating
Rotating

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Equal to
Four times
None of the listed here
Two times

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

0
0.1
1
0.5

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

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

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Is increased
Remains unchanged
None of the listed here
Is decreased

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

Decreased at starting
Increased under running conditions
None of the listed here
Increased at starting

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