electrical

Single Phase Induction Motor MCQ Questions and Answers Page - 2

1.

The  direction of rotation of a shade pole induction motor

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2.

The capacitor employed in a capacitor start induction motor has no

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3.

A capacitor selected for capacitor start induction motor should be rated for

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4.

The capacitor usually used on 1440 rpm, 50Hz capacitor start induction motor is of electrolytic type and ____capacity

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5.

The value of capacitor for a capacitor start induction motor can be adjusted to approximately 900 by

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6.

A capacitor start single phase induction motor  is used for

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7.

A capacitor start induction motor is switched on to supply with its capacitor replaced by a inductor of equivalent reactance . The motor will

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8.

If the capacitor of a capacitor start induction motor is short circuited the motor will

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9.

If the capacitor of a capacitor start induction motor fails to open when it picks up the speed

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10.

Capacitor start capacitor  run induction motor is basically a ____motor

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11.

two capacitor type single phase induction motor is generally coupled with the air conditioner compressor because it

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12.

 in a ceiling fan employing permanent capacitor motor

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13.

Capacitor start and capacitor run motors are used in

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14.

In a shaded pole motor the phase splitting is achieved by placing a shagging coil at the slot cut around the

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15.

In a shaded pole motor the rotating field is developed by using

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16.

Shaded pole motor is proved with

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17.

 In a shaded pole motor, shading coils are used to

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18.

in a shaded pole induction motor, locked rotor current is ____full load current

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19.

The speed of single phase induction motors can be controlled by

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20.

The wattage rating for a ceiling motor will be in the range

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21.

In a two-value capacitor motor, the capacitor used for running purpose is

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Answer : B

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22.

Which of the following motors can be run on A.C as well as D.C supply?

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Answer : A

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23.

In A.C series motor compensating winding is employed to

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Answer : C

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24.

Which of the following single-phase induction motor is generally used in time phonographs?

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Answer : C

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25.

Which of the following motors has highest starting torque?

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Answer : C

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26.

The repulsion start induction run motor is used because of

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Answer : D

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27.

In case of a shaded pole motor the direction of rotation of motor is

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Answer : A

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28.

In case of high-speed universal motor which of the following needs more attention?

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Answer : D

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29.

The wattage of motor for driving domestic sewing machine will be around?

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Answer : A

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30.

Which of the following single-phase motors has relatively poor starting torque?

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Answer : C

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31.

Which type of load is offered by cranes and hoists?

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Answer : D

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32.

The speed of a general motor is generally reduced by using

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Answer : A

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33.

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

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Answer : D

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34.

When a D.C series motor is connected to A.C supply, the power factor will be low because of

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Answer : A

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35.

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

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Answer : C

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36.

In which single-phase motor, the rotor has no teeth or winding?

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Answer : C

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37.

Which motor is normally free from mechanical and, magnetic vibration?

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Answer : C

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38.

As hysteresis motor are free from mechanical and magnetic vibration therefore these are considered as suitable for

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Answer : C

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39.

A reluctance motors

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Answer : D

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40.

In a hysteresis motor, the rotor must have

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Answer : A

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41.

The rotor of a hysteresis motor is made of

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Answer : C

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42.

The electric motor used in portable drills is

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Answer : C

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43.

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

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Answer : C

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44.

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

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Answer : B

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45.

Torque developed by a single-phase induction motor at starting is

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Answer : D

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46.

In split phase motor a min winding is of

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Answer : C

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47.

In repulsion motor, maximum torque is developed when

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Answer : A

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48.

If the centrifugal switch does not open at 70 to 80 % of synchronous speed of the motor, it would result in

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Answer : A

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49.

Speed torque characteristics of a repulsion induction motor is similar to that of a D.C

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Answer : C

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50.

In a ceiling fan employing capacitor run motor

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Answer : A

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51.

The shaded pole motor is used for

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Answer : B

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52.

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it

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Answer : C

Explanation :

53.

The speed/loads characteristics of a universal motor is same as that of

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Answer : C

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54.

The purpose of stator winding in the compensated repulsion motor is to

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Answer : B

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55.

The motor used for the compressor is

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Answer : C

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56.

Which of the following motor is used in a situation where load increases will speed?

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Answer : B

Explanation :

57.

In repulsion motor, zero torque is developed when

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Answer : D

Explanation :

58.

Centrifugal switch disconnects the auxiliary winding of the motor at about  ________  percent of synchronous speed

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Answer : B

Explanation :

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