Single phase induction motors Archives

21. The starting winding of a single-phase motor is placed in

Armature

Field

Rotor

Stator

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class="screen-reader-text">The starting winding of a single-phase motor is placed in

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

Armature winding

Field winding

Either armature winding or field winding

None of the above

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23. Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed

30 to 40

70 to 80

80 to 90

100

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

improve power factor

increase overload capacity

reduce fluctuations in torque

to improve torque

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Detailed SolutionIn a capacitor start and run motors the function of

the running capacitor in series with the auxiliary winding is to

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

10Â°

30Â°

60Â°

90Â°

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Detailed SolutionIn a capacitor start

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motor, the phase displacement between starting and running winding can be nearly

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

100 to 150 W

40 to 75 W

10 to 30 W

5 to 10 W

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class="screen-reader-text">The wattage of motor for driving domestic sewing machine will be around

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

Shaped pole motor

Split phase motor

Capacitor start motor

Capacitor run motor

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of the following motors will operate at high power factor ?

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

running winding only

starting winding only

either (A) or (B)

both (A) and (B)

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the connection of" class="read-more button" href="https://exam.pscnotes.com/mcq/direction-of-rotation-of-a-split-phase-motor-can-be-reversed-by-reversing-the-connection-of/#more-55280">Detailed Solution