Quiz On Single Phase Motor, Electrical Machine Quiz

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Quiz On Single Phase Motor

01. The efficiency rage of the shaded pole motors is

(a) 95% to 99%
(b) 80% to 90%
(c) 50% to 75%
(d) 5% to 35%

Ans: d

02. If the capacitor is replaced by resistance in capacitor start induction motor?

(a) torque will increase
(b) the power is less consumed by the motor
(c) In the reverse direction, the motor will run
(d) In the same direction, the motor will continue to run

Ans: d

03. The single-phase induction motor power factor is usually

(a) lagging
(b) always leading
(c) unity
(d) unity to 0.8 leading

Ans: a

04. The application of shaded pole motos is in?

(a) toys
(b) hair dryers
(c) circulators
(d) any of the above

Ans: d

05. The working principle of a hysteresis motor is

(a) hysteresis loss
(b) magnetization of rotor
(c) eddy current loss
(d) electromagnetic induction

Ans: a

06. The motor gives the highest starting torque in the following motors?

(a) D.C. shunt motor
(b) Schrage motor
(c) Repulsion start and induction run the motor
(d) Universal motor

Ans: b

07. The reluctance motor is preferred for which application?

(a) Electric shavers
(b) Refrigerators
(c) Signaling and timing devices
(d) Lifts and hoists

Ans: c

08. In the small lathes, the motor used is usually

(a) universal motor
(b) D.C. shunt motor
(c) single-phase capacitor run motor
(d) 3-phase synchronous motor

Ans: c

09. In the tape-recorders which of the following motor is used?

(a) Shaded pole motor
(b) Hysteresis motor
(c) Two value capacitor motor
(d) Universal motor

Ans: b

10. A single-phase induction motor is inherently

(a) self-starting with high torque
(b) self-starting with low torque
(c) non-self-starting with low torque
(d) non-self-starting with high torque

Ans: c

11. A Schrage motor can run at

(a) zero slip
(b) negative slip
(c) positive slip
(d) all of the above

Ans: d

12. A universal motor can run at

(a) A.C. only
(6) D.C. only
(c) either A.C. or D.C.
(d) none of the above

Ans: c

13. For timing and control purposes, which of the following motor is suitable?

(a) Reluctance motor
(b) Series motor
(c) Repulsion motor
(d) Universal motor

Ans: a

14. The single-phase induction motor operates at

(a) 0.6 power factor lagging
(b) 0.8 power factor lagging
(c) 0.8 power factor leading
(d) unity power factor

Ans: a

15. The auxiliary winding in the split-phase motor is of

(a) At the bottom thick wire is placed of the slots
(b) At the top thick wire is placed of the slots
(c) At the top thin wire is placed of the slots
(d) At the bottom thin wire is placed of the slots

Ans: c

16. At the high power factor, which of the following motor operate?

(a) Shaped pole motor
(b) Split phase motor
(c) Capacitor start motor
(d) Capacitor run motor

Ans: d

17. The capacitor used for running purposes in a two-value capacitor motor is

(a) air capacitor
(b) paper spaced oil-filled type
(c) ceramic type
(d) a.c. electrolytic type

Ans: b

18. The motor which can run on AC. as well as D.C. supply?

(a) Universal motor
(b) Repulsion motor
(c) Synchronous motor
(d) Reluctance motor

Ans: a

19. The compensating winding used in A.C motor is employed to

(a) reduce the effects of armature reaction
(b) increase the torque
(c) reduce sparking at the brushes
(d) none of the above

Ans: c

20. In time phonographs, which of the following motor is used?

(a) Resistance start
(b) Capacitor start capacitor run
(c) Shaded pole
(d) Universal

Ans: c

21. The following motor which has the highest starting torque?

(a) Repulsion motor
(b) Shaped pole motor
(c) Capacitor-start motor
(d) Split-phase motor

Ans: c

22. The repulsion-start induction-run motor is usually employed because of

(a) good power factor
(b) high efficiency
(c) minimum cost
(d) high starting torque

Ans: d

23. The direction of rotation of the motor in case of shaded pole motor is

(a) from the main pole to shaded pole
(b) from shaded pole to the main pole
(c) either of the above depending on the voltage
(d) On the power factor either of the depends

Ans: a

24. Which of the following needs more attention in the case of the high-speed universal motor?

(a) End play
(b) Air gap
(c) Insulation in rotor
(d) Balancing of rotor

Ans: d

25. The ceiling fan motor wattage rating is in the range of?

(a) 200 to 250 W
(b) 250 to 500 W
(c) 50 to 150 W
(d) 10 to 20 W

Ans: c

26. The running winding in the split-phase motor should have?

(a) high resistance and low inductance
(b) low resistance and high inductance
(c) high resistance as well as high inductance
(d) low resistance as well as low inductance

Ans: b

27. In the single-phase motor, if the capacitor is short-circuited?

(a) the motor will not start
(b) the motor will run
(c) In the reverse direction, the motor will run
(d) In the same direction, the motor will run at reduced r.p.m

Ans: a

28. In capacitor start single-phase motors

(a) the current in the starting winding leads the applied voltage
(b) the current in the starting winding lags the applied voltage
(c) the current in the starting winding is in phase with the voltage in running winding
(d) none of the above

Ans: a

29. The function of the running capacitor in series with the auxiliary winding in a capacitor start and run motors?

(a) improve power factor
(b) increase overload capacity
(c) reduce fluctuations in torque
(d) to improve torque

Ans: a

30. The phase displacement between running and the starting winding of the capacitor start motor is near?

(a) 10°
(b) 30°
(c) 60°
(d) 90°

Ans: d

31. In a split-phase motor?

(a) the centrifugal switch is connected through the starting winding
(b) the centrifugal switch is connected through the starting winding
(c) the centrifugal switch is connected through both the starting and running winding
(d) to control supply voltage the centrifugal switch is connected

Ans: a

32. In single-phase motor, the rotor developed at the starting is?

(a) more than the rated torque
(b) rated torque
(c) less than the rated torque
(d) zero

Ans: d

33. The motor which has high starting torque?

(a) Capacitor start motor
(b) Capacitor run motor
(c) Split phase motor
(d) Shaded pole motor

Ans: a

34. The motor has a higher power factor?

(a) Capacitor run motor
(b) Shaded pole motor
(c) Capacitor start motor
(d) Split phase motor

Ans: a

35. The revolving field is produced in the single-phase induction motor by the use of?

(a) inductor
(b) capacitor
(c) resistor
(d) shading coils

Ans: d

36. A centrifugal switch is disconnected with the starting winding when the motor?

(a) run for about 1 minute
(b) run for about 5 minutes
(c) comes to 50 to 70 percent of rated speed
(d) comes to 10 to 25 percent of rated speed

Ans: c

37. which of the following motor will be preferred for high starting torque and high speed?

(a) Universal motor
(b) Shaded pole type motor
(c) Capacitor start motor
(d) Capacitor start and run motor

Ans: a

38. In the fractional horsepower motor, the starting capacitor value will be?

(a) 100 uF
(6) 200 uF
(c) 300 uF
(d) 400 uF

Ans: c

39. The direction of rotation of the motor in repulsion motor?

(a) is opposite to that of brush shift
(b) As brush shift is it is same
(c) is independent of brush shift

Ans: b

40. In a single-phase motor the centrifugal switch

(a) isolates auxiliary winding of the motor
(b) isolates the main winding of the motor
(c) the main winding of the motor is reconnected
(d) the auxiliary winding of the motor is reconnected

Ans: a

41. In the capacitor-start single phase induction motor, if the capacitor replaced by an inductor of equivalent reactance value. It will?

(a) start and then stop
(b) start and run slowly
(c) start and run at rated speed
(d) not start at all

Ans: d

42. The motor used in the mixer?

(a) Repulsion motor
(b) Reluctance motor
(c) Hysteresis motor
(d) Universal motor

Ans: d

43. The motor which is self-starting?

(a) Split motor
(b) Shaded-pole motor
(c) Reluctance motor
(d) None of these

Ans: b

44. Burning out of windings in the motor is due to?

(a) short-circuited capacitor
(b) capacitor value hiving changed
(c) open circuiting of the capacitor
(d) none of the above

Ans: a

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