THREE PHASE INDUCTION MOTORS QUIZ

The complete circle diagram of induction motor can be drawn with the help of data found from

Stator resistance test

No-load test

Blocked rotor test

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

If any two phases for an induction motor are interchanged

The motor will burn

The motor will run in reverse direction

The motor will not run

The motor will run at reduced speed

TRUE ANSWER : ?
YOUR ANSWER : ?

Less maintenance troubles are experienced in case of

Both (A) and (B)

None of these

Slip ring induction motor

Squirrel cage induction motor

TRUE ANSWER : ?
YOUR ANSWER : ?

If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times

Decreased two times

Increased four times

Decreased four times

TRUE ANSWER : ?
YOUR ANSWER : ?

The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

1.5 Hz

2.5 Hz

0.05 Hz

5 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Less rotor losses

None of the listed here

Greater mechanical strength

Uniform torque

TRUE ANSWER : ?
YOUR ANSWER : ?

In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always less than the number of

Always greater than the number of

Always eqaul to the number of

Either more or less than the number of

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of the listed here

Partly star and partly delta

Delta

Star

TRUE ANSWER : ?
YOUR ANSWER : ?

The condition of induction motor at no load resemble those of a transformer whose secondady is _______

Supplying a variable resistive load

Short-circuited

None of the listed here

Open circuited

TRUE ANSWER : ?
YOUR ANSWER : ?

The injected e.m.f. in the rotor of induction motor must have

The same phase as the rotor e.m.f.

Zero frequency

High value for the satisfactory speed control

The same frequency as the slip frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

↑