Top 150+ Solved Single Phase Induction Motor MCQ Questions Answer
Q. The repulsion-start induction-run motor is used because of
a. good power factor
b. high efficiency
c. minimum cost
d. high starting torque
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. The speed of a universal motor is generally reduced by using
a. gear trains
b. V-belts
c. brakes
d. chains
Q. 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
Q. When a D.C. series motor is connected to A.C. supply, the power factor will be lowbecause 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
Q. The direction of rotation of universal motor can be reversed the by reversing the flowof current through
a. armature winding
b. field winding
c. either armature winding or field winding
d. none of the above
Q. 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
Q. Which motor is normally free from mechanical and magnetic vibrations ?
a. Split phase motor
b. Universal motor
c. Hysteresis motor
d. Shaded pole motor
Q. As hysteresis motors are free from mechanical and magnetic vibrations thereforethese are considered as suitable for
a. fans
b. blowers
c. sound equipment
d. mixer grinders
Q. A reluctance motor
a. is self-starting
b. is constant speed motor
c. needs no D.C. excitation
d. all of the above