THREE PHASE INDUCTION MOTORS QUIZ

The shape of the torque/slip curve of induction motor is

Straight line

Rectangular parabola

Parabola

Hyperbola

TRUE ANSWER : ?
YOUR ANSWER : ?

In an induction motor the relationship between stator slots and rotor slots is that

None of the listed here

Stator slots are equal to rotor slots

Stator slots are not exact multiple of rotor slots

Stator slots are exact multiple of rotor slots

TRUE ANSWER : ?
YOUR ANSWER : ?

In an induction motor if air gap increased

Bearing friction will reduce

Copper loss will reduce

Windage losses will be more

The power factor will be low

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum torque of a 3-phase induction motor under running conditions is

inversely proportional to rotor reactance at standstill

None of the listed here

Inveresly proportional to supply voltage

Directly proportional to rotor resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

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

5 Hz

1.5 Hz

2.5 Hz

0.05 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

The rotor of an induction motor runs at

Any of the above

Below synchronous speed

Synchronous speed

Above synchronous speed

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

Decreased four times

Increased four times

TRUE ANSWER : ?
YOUR ANSWER : ?

The torque developed by a 3 phase induction motor least depends on

Rotor power factor

Shaft diameter

Rotor current

Rotor emf

TRUE ANSWER : ?
YOUR ANSWER : ?

The starting torque of a 3-phase induction motor is _______ supply voltage.

Directly proportional to

Independent of

None of the listed here

Directly proportional to sqaure of

TRUE ANSWER : ?
YOUR ANSWER : ?

In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Greater than

Equal to

None of the listed here

Smaller than

TRUE ANSWER : ?
YOUR ANSWER : ?

↑