Single phase induction motors

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

10°
30°
60°
90°

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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