electrical

Single Phase Induction Motor MCQ Questions and Answers Page - 1

1.

A single phase induction motor is

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2.

A single phase induction motor is running at N rpm. Its synchronous speed is Ns. If its slip  with respect to forward field is s, what is the slp with respect to the backward field

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3.

A rotating magnetic field is produced by current is two windings displaced by 90 electrical degrees. This is the principle of

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4.

In an induction motor

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5.

The  torque developed by a single phase induction motor drops to zero at

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6.

The no load current of a sinlge phase induction motor is around ____% of full load current

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7.

The  power factor at which single phase induction mtors usually operate is

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8.

Which of the following tests are performed on single phase  ac motors

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9.

Single phase induction motors are made self starting by

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10.

The tow windings provided on the stator of a single phase induction motor, one main winding and the other auxiliary winding are connected

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11.

The stator winding of a single phase induction motor is splitted into two parts in order to

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12.

In a single phase induction motor

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13.

Phase splitting canbe accomplished  in  a single  phase induction motor

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14.

In a split phase motor the ratio of number of turns of auxiliary winding to that on main winding is

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15.

Why is a centrifugal switch used in a single phase induction motor

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16.

Centrifugal switch fitted on the rotor will operate when

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17.

The torque speed characteristic of two phase induction motor is largely affected by

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18.

The direction of rotation of a split phase induction motor can be reversed by reversing the connections to the supply of

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19.

The capacitor in a capacitor start induction run ac motor is connected in series with

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20.

A single phase induction motor is provided with a 3- phase slip ring rotor  connected to starting resistances. The motor would

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21.

Capacitor in a single phase induction motor is used for

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22.

In a split phase motor, the running winding should have

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Answer : B

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23.

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

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Answer : A

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24.

In capacitor start single-phase motors

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Answer : A

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25.

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

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Answer : A

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26.

In a capacitor start motor, the phase displacement between starting and running winding can be nearly

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Answer : D

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27.

In a split phase motor

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Answer : A

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28.

The rotor developed by a single-phase motor at starting is

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Answer : D

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29.

Which of the following motor will give relatively high starting torque?

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Answer : A

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30.

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

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Answer : A

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31.

In a shaded pole motor, the shading coil usually consist of

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Answer : B

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32.

 In a shaded pole single-phase motor, the revolving field is produced by the use of

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Answer : D

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33.

A centrifugal switch is used to dis-connect starting winding when motor has

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Answer : C

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34.

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

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Answer : A

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35.

The value of starting capacitor of a fractional horse power motor will be

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Answer : C

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36.

In repulsion motor direction of rotation of motor

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Answer : B

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37.

In a single-phase motor the centrifugal switch

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Answer : A

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38.

The running winding of a single-phase motor on testing with megger is found to be ground. Most probable location of the ground will be

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Answer : D

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39.

A capacitor start single phase induction motor is switched on to supply with its capacitor by an inductor of equivalent reactance value. It will

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Answer : D

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40.

Which of the following motors is used in mixes?

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Answer : D

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41.

Which of the following motor is inherently self-starting?

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Answer : B

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42.

The direction of rotation of a hysteresis motor is determined by

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Answer : B

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43.

Burning out of winding is due to

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Answer : A

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44.

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

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Answer : C

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45.

Short-circuiter is used in

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Answer : C

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46.

The range of efficiency for shaded pole motor is

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Answer : D

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47.

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

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Answer : D

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48.

The power factor of a single-phase induction motor is usually

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Answer : A

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49.

A shaded pole motor can be used for

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Answer : D

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50.

A hysteresis motor works on the principle of

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Answer : A

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51.

Which of eth following motor will give the highest starting torque?

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Answer : B

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52.

For which of the application a reluctance motor is preferred?

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Answer : C

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53.

The motor is used on small lathes is usually

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Answer : C

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54.

Which of the following motors is preferred for tape-recorders?

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Answer : B

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55.

A single –phase induction motor is

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Answer : C

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56.

A Schrage motor can run on

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Answer : D

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57.

A universal motor can run on

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Answer : C

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58.

Which of the following single –phase motors is suitable for timing and control purpose?

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Answer : A

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59.

Single phase induction motor usually operates on

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Answer : A

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60.

In split-phase motor auxiliary winding is of

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Answer : C

Explanation :

61.

Which of the following motors will operate at high power factor?

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Answer : D

Explanation :

Single Phase Induction Motor MCQ Questions and Answers Page - 1
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