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MCQs 1: Centrifugal switch disconnects the auxiliary winding of the motor at about ______ percent of synchronous speed?

30 to 40 70 to 80 80 to 90 100
Answer Explanation

MCQs 2: Which of the following motors is used in a situation where load increases with speed ?

Induction motor Three-phase series motor Schrage motor Hysteresis motor
Answer Explanation

MCQs 3: Which of the following motors is used for unity power factor ?

Hysteresis motor Schrage motor Universal motor Reluctance motor
Answer Explanation

MCQs 4: In repulsion motor, zero torque is developed when___________?

brush axis is 45° electrical to field axis brush axis coincides with the field axis brush axis is 90° electrical to field axis both B. and (c)
Answer Explanation

MCQs 5: The motor used for the compressors is____________?

d.c. series motor shaded pole motor capacitor-start capacitor-run motor reluctance motor
Answer Explanation

MCQs 6: The purpose of stator winding in the compensated repulsion motor is to_____________?

provide mechanical balance improve power factor and provide better speed regulation prevent hunting in the motor eliminate armature reaction
Answer Explanation

MCQs 7: The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it_____________?

improves the efficiency helps the rotor teeth to remain under the stator teeth helps in reducing the tendency of the rotor teeth to remain under the stator teeth improves the power factor
Answer Explanation

MCQs 8: In a ceilingfan employing capacitor run motor____________?

secondary winding surrounds the primary winding primary winding surrounds the secondary winding both are usual arrangements none of the above
Answer Explanation

MCQs 9: The speed/load characteristics of a universal motor is same as that of_____________?

A.C. motor D.C. shunt motor D.C. series motor none of the above
Answer Explanation

MCQs 10: The shaded pole motor is used for__________?

high starting torque low starting torque medium starting torque very high starting torque
Answer Explanation

MCQs 11: If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?

damage to the starting winding damage to the centrifugal switch overloading of running winding none of the above
Answer Explanation

MCQs 12: Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?

shunt motor series motor compound motor separately excited motor
Answer Explanation

MCQs 13: In split phase motor main winding is of _____________?

thin wire placed at the top of the slots thin wire placed at the bottom of the slots thick wire placed at the bottom of the slots thick wire placed at the top of the” slots
Answer Explanation

MCQs 14: In repulsion motor, maximum torque is developed when____________?

brush axis is at 45° electrical to the field axis brush axis coincides with the field axis brush axis is at 90° electrical to the field axis none of the above
Answer Explanation

MCQs 15: The rotor of a hysteresis motor is made of___________?

aluminium cast iron chrome steel copper
Answer Explanation

MCQs 16: Which of the following applications always have some load whenever switched on ?

Vacuum cleaners Fan motors Pistol drills All of the above
Answer Explanation

MCQs 17: Torque developed by a single phase induction motor at starting is_____________?

pulsating uniform none of the above nil
Answer Explanation

MCQs 18: The speed control of universal motor used for sewing machines is by____________?

friction varying the resistance tapping the field centrifugal mechanism
Answer Explanation

MCQs 19: The electric motor used in portable drills is__________?

capacitor run motor hysteresis motor universal motor repulsion motor
Answer Explanation

MCQs 20: In a hysteresis motor, the rotor must have____________?

retentivity resistivity susceptibility none of the above
Answer Explanation

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