THREE PHASE INDUCTION MOTORS QUIZ

0.5

0

0.1

1

Rotor power factor

Rotor current

Shaft diameter

Rotor emf

Speed control is required

High starting torque is required

Less costly motor is not required

High rotor resistance is required during running

300 rpm

1000 rpm

1200 rpm

600 rpm

The motor will run at reduced speed

The motor will not run

The motor will run in reverse direction

The motor will burn

Squirrel cage induction motor only but not with slip ring motor

Squirrel cage as well as slip ring induction motor

None of these

Slip ring motor only but not with squirrel cage induction motor

Supplying a variable resistive load

None of the listed here

Open circuited

Short circuited

Outer cage winding has good pf

None of the listed here

Lower cage winding has low reactance

Lower winding is more effective

Less rotor losses

Greater mechanical strength

Uniform torque

None of the listed here

Increases the rotor current

Decreases the rotor current

Rotor current remains same

Rotor current becomes zero