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Three Phase Induction Motors

Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S
1-S
S/1-S
1/S

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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.

None of the listed here
Two times
Equal to
Four times

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will run at reduced speed
The motor will not run
The motor will burn

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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
In a squirrel cage induction motor, the number of rotor bars is generally ________

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

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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

Bigger
Any of the listed here
Smaller
Same

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