SINGLE PHASE MOTORS QUIZ

Which of the following applications always have some load whenever switched on?

Vaccum cleaners

Piston drills

All of the listed here

Fan motors

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The repulsion start induction run motor is used because of

high starting torque

good power factor

minimum cost

high efficiency

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The purpose of starting winding in a single phase induction motor is to _____

Limit temperature rise of the machine

Reduce losses

Produce rotating flux in conjunction with main winding

None of the listed here

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Reluctance motors are

Doubly excited

Either of the listed

None of the listed here

Singly excited

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Which motor has unsymmetrical rotor?

Reluctance motor

Shaded pole motor

Universal motor

Split phase motor

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For the same rating, the size of a single phase induction motor is about _______ that of the corresponding 3-phase induction motor.

1.5 times

3 times

0.33 times

The same as

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Which motor is normally free from mechanical and magnetic vibrations?

Hysteresis motor

Universal motor

Shaded pole motor

Split phase motor

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The speed control of universal motor used for sewing machines is by

Centrifugal mechanism

Friction

Tapping the field

Varying the resistance

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Which of the following motors is used in mixies ?

Universal motor

Repulsion motor

Hysteresis motor

Reluctance motor

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Which of the following statements regarding hysteresis motor is in incorrect ?

It is extremely quiet in operation

Its high starting torque is due to its high rotor hysteresis loss

It accelerates from rest to full-speed almost instantaneously

It is extremely sensitive to fluctuations in supply voltage

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