Most recently Single Phase Induction Motors Multiple choice Questions and Answers pdf

41.    In a two value capacitor motor, the capacitor used for running purposes is
(a)    air capacitor
(b)    paper spaced oilfilled type
(c)    ceramic type
(d)    a.c. electrolytic type
Ans: b

42.    Which of the following motors can be run on AC. as well as D.C. supply ?
(a)    Universal motor
(b)    Repulsion motor
(c)    Synchronous motor
(d)    Reluctance motor
Ans: a

43.    In A.C. series motor compensating winding 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

44.    Which of the following single-phase induction motors is generally used in time phonographs ?
(a)    Resistance start
(b)    Capacitor start capacitor run
(c)    Shaded pole
(d)     Universal
 Ans: c

45.    Which of the following motors has highest starting torque ?
(a)    Repulsion motor
(b)    Shaped pole motor
(c)    Capacitor-start motor
(d)    Split-phase motor
Ans: c

46.    The repulsion-start induction-run motor is used because of
(a)    good power factor
(b)    high efficiency
(c)    minimum cost
(d)    high starting torque
Ans: d

47.    In case of a shaded pole motor the direction of rotation of the motor is
(a)    from main pole to shaded pole
(b)    from shaded pole to main pole
(c)    either of the above depending on voltage
(d)    either of the above depending on power factor
Ans: a

48.    In case of high speed universal motor which of the following needs more attention ?
(a)     End play
(b)     Air gap
(c)    Insulation in rotor
(d)    Balancing of rotor
Ans: d

49.    The wattage rating for a ceiling fan motor will be in the range
(a) 200 to 250 W
(b) 250 to 500 W
(c) 50 to 150 W   
(d) 10 to 20 W
Ans: c

50.    The wattage of motor for driving domestic sewing machine will be around
(a) 100 to 150 W
(b) 40 to 75 W
(c) 10 to 30 W
(d) 5 to 10 W
Ans: a

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