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Three Phase Induction Motors

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

Any of the listed here
Same
Smaller
Bigger

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load
Starting
No load
Full load

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1600 rpm
2400 rpm
1200 rpm
400 rpm

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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.

Equal to
None of the listed here
Four times
Two times

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

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

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

Less costly motor is not required
High rotor resistance is required during running
High starting torque is required
Speed control is required

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