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- Single Phase Induction Motors Mcqs
- Single Phase Induction Motors Mcqs - Set 3
MCQs 1: Locked rotor current of a shaded pole motor is____________?
equal to full load current
less than full load current
slightly more than full load current
several times the full load current
MCQs 2: Which of the following statements regarding repulsion-start induction motor is incorrect ?
It requires more maintenance of commutator and other mechanical devices
It makes quite a bit of noise on starting
In fractional horse power motors, it has replaced the capacitor motors
It is not easily reversed
MCQs 3: After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on ______________?
MCQs 4: A.C. series motor as compared to D.C. series motor has__________?
smaller brush width
less number of field turns
more number of armature turns
less air gap
all of the above
MCQs 5: Hysteresis motor is particularly useful for high-quality record players and tape-recorders because___________?
it revolves synchronously
it is not subject to any magnetic or mechanical vibrations
it can be easily manufactured in extremely small sizes of up to 1 W output
it develops hysteresis torque which is extremely steady both in amplitude and phase
MCQs 6: Which of the following statements regarding single-phase induction motors correct?
It requires only one winding
It can rotate in one direction only
It is self-starting
It is not self-starting
MCQs 7: Speed control of a universal motor is achieved by__________?
varying field flux with tapped field windings
connecting rheostat in series
applying variable voltage by means of silicon controlled rectifier
applying variable voltage by means of variable auto-transformer
all of the above methods
MCQs 8: Which of the following statements regarding hysteresis motor is in incorrect?
It is extremely sensitive to fluctuations in supply voltage
Its high starting torque is due to its high rotor hysteresis loss
It is extremely quiet in operation
It accelerates from rest to full-speed almost instantaneously
MCQs 9: The starting winding of a single-phase motor is placed in_________?
MCQs 10: The speed of a universal motor is usually reduced by using____________?
MCQs 11: A reluctance motor____________?
MCQs 12: Which motor is normally free from mechanical and magnetic vibrations ?
MCQs 13: As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?
MCQs 14: The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
MCQs 15: When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
high inductance of field and armature circuits
induced current in rotor due to variations of flux
fine copper wire winding
none of the above
MCQs 16: In which single-phase motor, the rotor has no teeth or winding ?
MCQs 17: The speed of a universal motor is generally reduced by using_________?
MCQs 18: Which of the following single-phase motors has relatively poor starting torque ?
MCQs 19: Which of the following motors can be used for unity power factor ?
MCQs 20: Which type of load is offered by cranes and hoists ?
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