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Three Phase Induction Motors

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 air gap between stator and rotor of 3-phase induction motor ranges from ______

0.4 mm to 4 mm
4 cm to 6 cm
2 cm to 4 cm
1 cm to 2 cm

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Infinity
Absent
Small
Large

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

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

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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 not run
The motor will burn
The motor will run at reduced speed

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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.

Two times
None of the listed here
Four times
Equal to

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