Top 150+ Solved Single Phase Induction Motor MCQ Questions Answer
Q. In a hysteresis motor, the rotor must have
a. retentivity
b. resistivity
c. susceptibility
d. none of the above
Q. The electric motor used in portable drills is
a. capacitor run motor
b. hysteresis motor
c. universal motor
d. repulsion motor
Q. 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
Q. 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
Q. Torque developed by a single phase induction motor at starting is
a. pulsating
b. uniform
c. none of the above
d. nil
Q. 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
Q. 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
Q. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed ofmotor, 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
Q. 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
Q. 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
Q. The shaded pole motor is used for
a. high starting torque
b. low starting torque
c. medium starting torque
d. very high starting torque
Q. The rotor slots, in an induction motor, are usually not quite parallel to the shaftbecause 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
Q. 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
Q. 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