THREE PHASE INDUCTION MOTORS QUIZ

None of the listed here

Leakage reactances are decreased

Leakage reactances are increased

No load current is decreased

Two

One

Three

Four

Increased under running conditions

Increased at starting

Decreased at starting

None of the listed here

Number of poles

Phase sequence of supply voltage

Supply frequency

Magnitude of supply voltage

Always revolves in the direction of stator flux

None of the listed here

Always revolves in the direction opposite to stator flux

Insufficient data

None of these

Supply frequency

Copper losses in motor

Supply voltage

Rheostatic control

None of the listed here

Cascade control

Pole changing

By auto transformer starting

None of the listed here

Direct on line

Star-delta starting

Rotor speed is less than the synchronous speed of the field and are in the same direction

Rotor speed is more than the synchronous speed of the field and are in the same direction

None of these

Magnetic field and rotor rotate in opposite direction

External resistance can be inserted in the rotor circuit

None of the listed here

It requires less maintenance

It is inexpensive