THREE PHASE INDUCTION MOTORS QUIZ

Less maintenance troubles are experienced in case of

Both (A) and (B)

None of these

Squirrel cage induction motor

Slip ring induction motor

TRUE ANSWER : ?
YOUR ANSWER : ?

In a double squirrel cage induction motor, the outer cage winding has _______

High inductance

High resistance

None of the listed here

Low resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following component is usually fabricated out of silicon steel?

Stator core

Bearings

Shaft

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

600 rpm

1200 rpm

300 rpm

1000 rpm

TRUE ANSWER : ?
YOUR ANSWER : ?

The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm

0.4 mm to 4 mm

2 cm to 4 cm

1 cm to 2 cm

TRUE ANSWER : ?
YOUR ANSWER : ?

A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

980 W

500 W

200 W

20 W

TRUE ANSWER : ?
YOUR ANSWER : ?

When a 3-phase induction motor is at no load, the slip is ______

0.5

1

Practically zero

0.2

TRUE ANSWER : ?
YOUR ANSWER : ?

The rotor of an induction motor runs at

Synchronous speed

Any of the above

Below synchronous speed

Above synchronous speed

TRUE ANSWER : ?
YOUR ANSWER : ?

The advantage of wound rotor motor is that _______

It is inexpensive

None of the listed here

External resistance can be inserted in the rotor circuit

It requires less maintenance

TRUE ANSWER : ?
YOUR ANSWER : ?

The speed of a squirrel cage induction motor is changed by

Rheostatic control

Pole changing

Cascade control

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

↑