Hiried Single Phase Induction Motors Multiple choice Questions and Answers pdf

51.    Which of the following single-phase motors has relatively poor starting torque ?
(a)    Universal motor
(b)    Repulsion motor
(c)    Capacitor motor
(d)    All single phase motors have zero starting torque
Ans: c

52.    Which type of load is offered by cranes and hoists ?
(a)     Gradually varying load
(b)     Non-reversing, no-load start
(c)    Reversing, light start
(d)    Reversing, heavy start
 Ans: d

53.    The speed of a universal motor is generally reduced by using
(a) gear trains     
(b) V-belts
(c) brakes 
(d) chains
Ans: a

54.    Which of the following motors can be used for unity power factor ?
(a)    Capacitor run motor
(b)    Shaded pole motor
(c)    Hysteresis motor
(d)    Schrage motor
Ans: d

55.    When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
(a)    high inductance of field and armature circuits
(b)    induced current in rotor due to variations of flux
(c)    fine copper wire winding
(d)    none of the above
Ans: a

56.    The direction of rotation of universal motor can be reversed the by reversing the flow of current through
(a)    armature winding
(b)    field winding
(c)    either armature winding or field winding
(d)    none of the above
Ans: c

57.    In which single-phase motor, the rotor has no teeth or winding ?
(a)    Split phase motor
(b)    Reluctance motor
(c)    Hysteresis motor
(d)    Universal motor
Ans: c

58.    Which motor is normally free from mechanical and magnetic vibrations ?
(a)    Split phase motor
(b)    Universal motor
(c)    Hysteresis motor
(d)    Shaded pole motor
Ans: c

59.    As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
(a)    fans
(b)    blowers
(c)    sound equipment
(d)    mixer grinders
Ans: c

60.    A reluctance motor
(a)    is self-starting
(b)    is constant speed motor
(c)    needs no D.C. excitation
(d)    all of the above
Ans: d

Read More Questions: 
Single Phase Induction Motors MCQs Part1
Single Phase Induction Motors MCQs Part2
Single Phase Induction Motors MCQs Part3
Single Phase Induction Motors MCQs Part4
Single Phase Induction Motors MCQs Part5
Single Phase Induction Motors MCQs Part6
Single Phase Induction Motors MCQs Part7
Single Phase Induction Motors MCQs Part8
Single Phase Induction Motors MCQs Part9
Single Phase Induction Motors MCQs Part10
Single Phase Induction Motors MCQs Part11