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Three Phase Induction Motors

Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Equal to stator poles
Prime number
Even number
None of the listed here

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Rotor inductive reactance
Frequency
All of the listed here
Square of supply voltage

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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
A 3 phase induction motor is ________

Essentially a constant speed motor
A variable speed motor
Not easily maintainable
Very costly

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Same
Bigger
Any of the listed here
Smaller

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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

2 Hz
20 Hz
50 Hz
200 Hz

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