Objective Single Phase Induction Motors Questions and Answers pdf

71.    In a ceilingfan employing capacitor run motor
(a)    secondary winding surrounds the primary winding
(b)    primary winding surrounds the secondary winding
(c)    both are usual arrangements
(d)     none of the above
Ans: a

72.    The shaded pole motor is used for
(a)    high starting torque
(b)    low starting torque
(c)    medium starting torque
(d)    very high starting torque
Ans: b

73.    The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
(a)     improves the efficiency
(b)     helps the rotor teeth to remain under the stator teeth
(c)    helps in reducing the tendency of the rotor teeth to remain under the stator teeth
(d)    improves the power factor
Ans: c

74.    The speed/load characteristics of a universal motor is same as that of
(a)     A.C. motor
(b)     D.C. shunt motor
(c)    D.C. series motor
(d)    none of the above
Ans: c

75.    The purpose of stator winding in the compensated repulsion motor is to
(a)    provide mechanical balance
(b)    improve power factor and provide better speed regulation
(c)    prevent hunting in the motor
(d)    eliminate armature reaction
Ans: b

76.    Which of the following motors is used for unity power factor ?
(a)     Hysteresis motor
(b)     Schrage motor
(c)    Universal motor
(d)    Reluctance motor
Ans: b

77.    The motor used for the compressors is
(a)    d.c. series motor
(b)    shaded pole motor
(c)    capacitor-start capacitor-run motor
(d)    reluctance motor
Ans: c

78.    Which of the following motors is used in a situation where load increases with speed ?
(a)     Induction motor
(b)     Three-phase series motor
(c)    Schrage motor
(d)    Hysteresis motor
Ans: b

79.    In repulsion motor, zero torque is developed when
(a)    brush axis is 45° electrical to field axis
(b)    brush axis coincides with the field axis
(c)    brush axis is 90° electrical to field axis
(d)    both (b) and (c)
Ans: d

80.    Centrifugal switch disconnects the auxiliary winding of the motor at about ____    percent of synchronous speed
(a) 30 to 40 
(b) 70 to 80
(c) 80 to 90 
(d) 100
Ans: b

Read More Questions: 
Single Phase Induction Motors MCQs Part1
Single Phase Induction Motors MCQs Part2
Single Phase Induction Motors MCQs Part3
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Single Phase Induction Motors MCQs Part8
Single Phase Induction Motors MCQs Part9
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Single Phase Induction Motors MCQs Part11