THREE PHASE INDUCTION MOTORS QUIZ

If the rotor slots are made deeper, rotor resistance is ______

Increased under running conditions

None of the listed here

Decreased at starting

Increased at starting

TRUE ANSWER : ?
YOUR ANSWER : ?

The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Full load

Starting

No load

Half full load

TRUE ANSWER : ?
YOUR ANSWER : ?

If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are increased

None of the listed here

No load current is decreased

Leakage reactances are decreased

TRUE ANSWER : ?
YOUR ANSWER : ?

The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here

Star

Partly star and partly delta

Delta

TRUE ANSWER : ?
YOUR ANSWER : ?

Slip rings are usually made of

Carbon

Copper

Aluminium

Phospor bronze

TRUE ANSWER : ?
YOUR ANSWER : ?

The stator of a three phase induction motor produces _______ magnetic field.

Steady

Alternating

Rotating

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The direction of rotation of field in a 3 phase induction motor depends upon _____

Number of poles

Magnitude of supply voltage

Supply frequency

Phase sequence of supply voltage

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum torque in an induction motor depends on

Frequency

Rotor inductive reactance

All of the listed here

Square of supply voltage

TRUE ANSWER : ?
YOUR ANSWER : ?

Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring

None of the listed here

Slip ring induction motor

Squirrel cage induction motor

TRUE ANSWER : ?
YOUR ANSWER : ?

An induction motor with 1000 r.p.m. speed will have

4 poles

6 poles

8 poles

2 poles

TRUE ANSWER : ?
YOUR ANSWER : ?

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