THREE PHASE INDUCTION MOTORS QUIZ

S × rotor input

(1-S) × rotor input

(1+S) × rotor input

(S-1) × rotor input

Cast iron

Carbon steel

High speed steel

Stainless steel

Synchronous speed

Above synchronous speed

Any of the above

Below synchronous speed

A variable speed motor

Essentially a constant speed motor

Not easily maintainable

Very costly

None of the listed here

Leakage reactances are decreased

No load current is decreased

Leakage reactances are increased

k/torque with direct switching

K2 × torque with direct switching

k2/torque with direct switching

K × torque with direct switching

S × rotor input

(1+S) × rotor input

(1-S) × rotor input

None of the listed here

1/S

1-S

S/1-S

S

Using DOL starter

Auto transformer starter

Proper ventilation

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

Equal to

Greater than

Smaller than

None of the listed here