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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
1
Practically zero
0.2

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

2880 rpm
1000 rpm
730 rpm
1440 rpm

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Three Phase Induction Motors
Reduced voltage starter can be used with

Slip ring motor only but not with squirrel cage induction motor
Squirrel cage as well as slip ring induction motor
Squirrel cage induction motor only but not with slip ring motor
None of these

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Large
Practically zero
Small
None of the listed here

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

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