Single Phase Induction Motors Objective type Questions and Answers pdf

61.    In a hysteresis motor, the rotor must have
(a)    retentivity
(b)    resistivity
(c)    susceptibility
(d)     none of the above
Ans: a

62.    The rotor of a hysteresis motor is made of
(a) aluminium    
(b) cast iron
(c) chrome steel  
(d) copper
Ans: c

63.    The electric motor used in portable drills is
(a)    capacitor run motor
(b)    hysteresis motor
(c)    universal motor
(d)    repulsion motor
Ans: c

64.    Which of the following applications always have some load whenever switched on ?
(a)    Vacuum cleaners
(b)    Fan motors
(c)    Pistol drills
(d)    All of the above
Ans: c

65.    The speed control of universal motor used for sewing machines is by
(a)    friction
(b)    varying the resistance
(c)    tapping the field
(d)    centrifugal mechanism
Ans: b

66.    Torque developed by a single phase induction motor at starting is
(a)     pulsating
(b)     uniform
(c)    none of the above
(d)    nil
Ans: d

67.    In split phase motor main winding is of
(a)     thin wire placed at the top of the slots
(b)     thin wire placed at the bottom of the slots
(c)    thick wire placed at the bottom of the slots
(d)    thick wire placed at the top of the" slots
Ans: c

68.    In repulsion motor, maximum torque is developed when
(a)    brush axis is at 45° electrical to the field axis
(b)    brush axis coincides with the field axis
(c)    brush axis is at 90° electrical to the field axis
(d)    none of the above
Ans: a

69.    If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
(a)    damage to the starting winding
(b)    damage to the centrifugal switch
(c)    overloading of running winding
(d)    none of the above
Ans: a

70.    Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
(a) shunt motor  
(b) series motor
(c) compound motor
(d) separately excited motor
Ans: c

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