THREE PHASE INDUCTION MOTORS QUIZ

Decreased four times

Increased two times

Decreased two times

Increased four times

Starting only

None of the listed here

Both starting and operation

Operation only

10 to 20 %

None of the listed here

2 to 5 %

20 to 30 %

None of the listed here

Large

Practically zero

Small

Remains unchanged

None of the listed here

Is increased

Is decreased

20 Hz

200 Hz

2 Hz

50 Hz

None of the listed here

Stator slots are exact multiple of rotor slots

Stator slots are not exact multiple of rotor slots

Stator slots are equal to rotor slots

Has simple and rugged construction

Provides fine speed control

Provides high starting torque

None of the listed here

Using DOL starter

Proper ventilation

Auto transformer starter

Having number of rotor slots more or less than the number of stator slots

High rotor resistance is required during running

Speed control is required

Less costly motor is not required

High starting torque is required