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MCQs 1: A hysteresis motor works on the principle of__________?

hysteresis loss magnetisation of rotor eddy current loss electromagnetic induction
Answer Explanation

MCQs 2: Which of the following motor will give the highest starting torque ?

D.C. shunt motor Schrage motor Repulsion start and induction run motor Universal motor
Answer Explanation

MCQs 3: The power factor of a single-phase induction motor is usually?

lagging always leading unity unity to 0.8 leading
Answer Explanation

MCQs 4: A shaded pole motor can be used for_____________?

toys hair dryers circulators any of the above
Answer Explanation

MCQs 5: In a capacitor start single-phase motor, when capacitor is replaced by a resistance____________?

torque will increase the motor will consume less power motor will run in reverse direction motor will continue to run in same direction
Answer Explanation

MCQs 6: Short-circuiter is used in_____________?

repulsion induction motor repulsion motor repulsion start induction run motor none of the above
Answer Explanation

MCQs 7: The range of efficiency for shaded pole motors is______________?

95% to 99% 80% to 90% 50% to 75% 5% to 35%
Answer Explanation

MCQs 8: Burning out of winding is due to___________?

short circuited capacitor capacitor value hiving changed open circuiting of capacitor none of the above
Answer Explanation

MCQs 9: Direction of rotation of a split phase motor can be reversed by reversing the connection of__________?

running winding only starting winding only either A. or (b) both A. and (b)
Answer Explanation

MCQs 10: Which of the following motors is inherently self starting ?

Split motor Shaded-pole motor Reluctance motor None of these
Answer Explanation

MCQs 11: The direction of rotation of an hysteresis motor is determined by____________?

interchanging the supply leads position of shaded pole with respect to main pole retentivity of the rotor material none of these
Answer Explanation

MCQs 12: A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will______________?

start and then stop start and run slowly start and run at rated speed not start at all
Answer Explanation

MCQs 13: Which of the following motors is used in mixies ?

Repulsion motor Reluctance motor Hysteresis motor Universal motor
Answer Explanation

MCQs 14: In a single phase motor the centrifugal switch____________?

disconnects auxiliary winding of the motor disconnects main winding of the motor reconnects the main winding the motor reconnects the main winding the motor
Answer Explanation

MCQs 15: The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be___________?

at the end connections at the end terminals anywhere on the winding inside a slot at the slot edge where coil enters or comes out of the slot
Answer Explanation

MCQs 16: The value of starting capacitor of a fractional horse power motor will be__________?

100 uF 200 uF 300 uF 400 uF
Answer Explanation

MCQs 17: In repulsion motor direction of rotation of motor____________?

is opposite to that of brush shift is the same as that of brush shift is independent of brush shift
Answer Explanation

MCQs 18: A centrifugal switch is used to dis- connect ‘starting winding when motor has___________?

run for about 1 minute run for about 5 minutes picked up about 50 to 70 per cent of rated speed picked up about 10 to 25 per cent of rated speed
Answer Explanation

MCQs 19: In a shaded pole single-phase motor, the revolving field is produced by the use of_________?

inductor capacitor resistor shading coils
Answer Explanation

MCQs 20: If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?

Universal motor Shaded pole type motor Capacitor start motor Capacitor start and run motor
Answer Explanation

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