THREE PHASE INDUCTION MOTORS QUIZ

None of the listed here

Practically zero

Small

Large

Line voltage

Rotor current

Running torque

Slip

50 Hz

2 Hz

20 Hz

200 Hz

Stator slots are exact multiple of rotor slots

Stator slots are not exact multiple of rotor slots

None of the listed here

Stator slots are equal to rotor slots

High starting torque is required

Less costly motor is not required

High rotor resistance is required during running

Speed control is required

Not easily maintainable

Essentially a constant speed motor

Very costly

A variable speed motor

None of the listed here

Directly proportional to

Directly proportional to sqaure of

Independent of

Proper ventilation

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

Using DOL starter

Auto transformer starter

None of the listed here

(1+S) × rotor input

S × rotor input

(1-S) × rotor input

1-S

S/1-S

S

1/S