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Three Phase Induction Motors

Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Two
Three
One
None

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

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

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

2%
Less than 1%
4%
1.5 %

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

50 Hz
200 Hz
20 Hz
2 Hz

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are increased
None of the listed here
Leakage reactances are decreased

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Three Phase Induction Motors
The induction motor has lagging power factor during

Starting only
None of the listed here
Operation only
Both starting and operation

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MORE MCQ ON Three Phase Induction Motors

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