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Three Phase Induction Motors

Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

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

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Eddy currents
Mutual induction
Hysteresis
Self induction

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

Large slip
high resistance
Low resistance
High reactance

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

K × torque with direct switching
k/torque with direct switching
k2/torque with direct switching
K2 × torque with direct switching

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

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
None of these
Copper losses in motor
Supply voltage

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