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Three Phase Induction Motors

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

Full load
No load
Starting
Half full load

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Steady
None of the listed here
Rotating
Alternating

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

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

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

60 to 90%
80 to 90%
95 to 98 %
99%

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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 _____

1200 rpm
2400 rpm
1600 rpm
400 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 induction motor only but not with slip ring motor
None of these
Squirrel cage as well as slip ring induction motor

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