Single phase induction motor Mcq

01. In a split phase motor, the running winding should have

High resistance and low inductance

High resistance and High inductance

Low resistance and high inductance

Low resistance and Low inductance


02. If the capacitor of a single-phase motor is short-circuited

The motor will not start

The motor will run in the same direction at reduced speed

The motor will run in reverse direction

None of the above

03. In a split phase motor

Both starting and running windings are connected through a centrifugal switch

Centrifugal switch is used to control supply voltage

The running winding is connected through a centrifugal switch

The starting winding is connected through a centrifugal switch


04. The torque developed by a single-phase motor at starting is

less than the rated torque

More than the rated torque

zero

None of the above


05. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

1 point

Improve power factor

Reduce fluctuations in torque

Increase overload capacity

To improve torque


06. Which of the following motor will have relatively higher power factor?

1 point

Capacitor start motor

Shaded pole motor

Capacitor run motor

Split phase motor

07. A centrifugal switch is used to disconnect ‘starting winding when motor has

1 point

Picked up 10% speed

Picked up 20% speed

Picked up 5 – 10% speed

Picked up 50 – 70% speed

08. In repulsion motor direction of rotation of motor

1 point

Same as that of brush shift

Independent of brush shift

Opposite to that of brush shift

None of the above

09. If a particular application needs high-speed and high starting torque, then which of the following motor will be preferred?

1 point

Shaded pole motor

Capacitor start motor

Capacitor run motor

Universal Motor

10. Which of the following motor is used in the mixer?

1 point

Repulsion Motor

Reluctance Motor

Hysteresis Motor

Universal Motor

11. The direction of rotation of an hysteresis motor is determined by

1 point

Retentivity of the rotor material

Position of shaded Pole with respect to the main pole

Interchanging the supply leads

None of the above


12. Direction of rotation of a split phase motor can be reversed by reversing the connection of

Starting winding

Running winding

Either 1 or 2

None of the above


13. In a capacitor start single-phase motor when capacitor is replaced by a resistance

Motor will consume less power

Motor will continue to run in the same direction

Motor will stop

None of the above


14. A capacitor start single phase induction motor when capacitor is replaced by inductance

Motor will not start

Start and run

Small hp motor can start but large hp motor will not start

None of the above


15. A hysteresis motor works on the principle of

1 point

Eddy current loss

Magnetization of rotor

Hysteresis loss

Electromagnetic induction

16. Which of the following single-phase motors is suitable for timing and control purposes

1 point

Universal Motor

Reluctance Motor

Series Motor

Split phase motor

17. In A.C. series motor compensating winding is employed to

1 point

Increase the torque

Reduce the effect of armature reaction

Reduce sparking in brushes

Both 2 and 3

18. The repulsion-start induction-run motor is used because of

Good Power factor

High efficiency

High starting torque

Low cost


19. The speed of a universal motor is generally reduced by using

Gear train

V- belt

Brakes

Chains

20. Which of the following motors can be used for unity power factor?

Hysteresis motor

Capacitor motor

Schrage motor

Split phase motor


21. In split-phase motor, auxiliary winding is made up of

Thick wire placed at top of the slot

Thin wire placed at the bottom of the slot

Thick wire placed at bottom of the slot

Thin wire placed at top of the slot


22. In a two value capacitor motor, the capacitor used for running purposes is

1 point

Paper spaced oil filled type

Air capacitor

Ceramic type

None of the above

23. In shaded pole motor, the direction of rotation of motor is

1 point

From shaded pole to the main pole

From the main pole to shaded pole

Either 1 or 2

None of the above

24. The direction of rotation of universal motor can be reversed the by reversing the flow of current through

1 point

Field winding

Armature winding

Either 1 or 2

None of the above


25. Which motor is normally free from mechanical and magnetic vibrations?

1 point

Capacitance motor

Hysteresis Motor

Reluctance Motor

Split phase motor


Read more» Dc generator


Post a Comment

Previous Post Next Post