A.C.SINGLE PHASE INDUCTION MCQ-1

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Created By-N.K.Rathod sir

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1) In a split-phase motor, the running winding should have

2 points

A) High resistance and low inductance

B) High resistance and High inductance

C) Low resistance and high inductance

D) Low resistance and low inductance

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

2 points

A) The motor will not start

B) The motor will run in the same direction at a reduced speed

C) The motor will run in the reverse direction

D) None of the above

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3) In a split-phase motor

2 points

A) Both starting and running windings are connected through a centrifugal switch

B) Centrifugal switch is used to control supply voltage

C) The running winding is connected through a centrifugal switch

D) The starting winding is connected through a centrifugal switch

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3) In a split-phase motor

2 points

A) Both starting and running windings are connected through a centrifugal switch

B) Centrifugal switch is used to control supply voltage

C) The running winding is connected through a centrifugal switch

D) The starting winding is connected through a centrifugal switch

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4) The torque developed by a single-phase motor at starting is

2 points

A) less than the rated torque

B) More than the rated torque

C) zero

D) None of the above

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

2 points

A) Improve power factor

B) Reduce fluctuations in torque

C) Increase overload capacity

D) To improve torque

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

2 points

A) Capacitor start motor

B) Shaded pole motor

C) Capacitor run motor

D) Split phase motor

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7) A centrifugal switch is used to disconnect ‘starting winding when motor has

2 points

A) Picked up 10% speed

B) Picked up 20% speed

C) Picked up 5 – 10% speed

D) Picked up 50 – 70% speed

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8) In repulsion motor direction of rotation of the motor

2 points

A) Same as that of brush shift

B) Independent of brush shift

C) Opposite to that of brush shift

D) None of the above

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

2 points

A) Shaded pole motor

B) Capacitor start motor

C) Capacitor run motor

D) Universal Motor

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

2 points

A) Repulsion Motor

B) Reluctance Motor

C) Hysteresis Motor

D) Universal Motor

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11) The direction of rotation of a hysteresis motor is determined by

2 points

A) Retentivity of the rotor material

B) Position of shaded Pole with respect to the main pole

C) Interchanging the supply leads

D) None of the above

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12) The direction of rotation of a split-phase motor can be reversed by reversing the connection of

2 points

A) Starting winding

B) Running winding

C) Either 1 or 2

D) None of the above

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

2 points

A) Motor will consume less power

B) Motor will continue to run in the same direction

C) Motor will stop

D) None of the above

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14) A capacitor start a single phase induction motor when the capacitor is replaced by an inductance

2 points

A) Motor will not start

B) Start and run

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

D) None of the above

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15) A hysteresis motor works on the principle of

2 points

A) Eddy current loss

B) Magnetization of rotor

C) Hysteresis loss

D) Electromagnetic induction

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

2 points

A) Universal Motor

B) Reluctance Motor

C) Series Motor

D) Split phase motor

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

2 points

A) Increase the torque

B) Reduce the effect of armature reaction

C) Reduce sparking in brushes

D) Both 2 and 3

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

2 points

Good Power factor

High efficiency

High starting torque

Low cost

B) Reduce the effect of armature reaction

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

2 points

A) Gear train

B) V- belt

C) Brakes

D) Chains

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

2 points

A) Hysteresis motor

B) Capacitor motor

C) Schrage motor

D) Split phase motor

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21) In a split-phase motor, the auxiliary winding is made up of

2 points

A) Thick wire placed at top of the slot

B) Thin wire placed at the bottom of the slot

C) Thick wire placed at bottom of the slot

D) Thin wire placed at top of the slot

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

2 points

A) Paper spaced oil-filled type

B) Air capacitor

C) Ceramic type

D) None of the above

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23) The direction of rotation of the universal motor can be reversed by reversing the flow of current through

2 points

A) Field winding

B) Armature winding

C) Either 1 or 2

D) None of the above

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24) Which motor is normally free from mechanical and magnetic vibrations?

2 points

A) Capacitance motor

B) Hysteresis Motor

C) Reluctance Motor

D) Split phase motor

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25) In a hysteresis motor, the rotor must have

2 points

A) High resistivity

B) High retentivity

C) High susceptibility

D) None of the above

Clear selection

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