Single phase induction motors Archives

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

Armature

Field

Rotor

Stator

Detailed SolutionThe 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

Detailed SolutionThe direction of rotation of universal motor can be reversed the by reversing the flow of current through

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

Detailed SolutionCentrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed

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

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°

Detailed SolutionIn a capacitor start 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

Detailed SolutionThe 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

Detailed SolutionWhich 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)

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

29. The shaded pole motor is used for

high starting torque

low starting torque

medium starting torque

very high starting torque

Detailed SolutionThe shaded pole motor is used for

30. A universal motor is one which

can be operated either on D.C. or A.C. supply at approximately the same speed and output

can be marketed internationally

or A.C. supply at approximately the same speed and output B. can be marketed internationally C. runs at dangerously high speed on no-load

none of the above

Detailed SolutionA universal motor is one which

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