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Three Phase Induction Motors

Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.1
0.5
0
1

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

5 Hz
0.05 Hz
1.5 Hz
2.5 Hz

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing supply frequency
Reducing supply voltage
Changing winding resistance
Changing number of poles

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Three Phase Induction Motors
An induction motor is

Self starting with zero torque
Self starting with high torque
Self starting with low torque
Non self starting

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Greater mechanical strength
Uniform torque
None of the listed here
Less rotor losses

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

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