Electrical Engineering MCQs

Page No. 259

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?


a high inductance of field and armature circuits


b induced current in rotor due to variations of flux


cfine copper wire winding


dnone of the above



In which single-phase motor, the rotor has no teeth or winding ?


aSplit phase motor


bReluctance motor


cHysteresis motor


dUniversal motor


View Answer Hysteresis motor

The speed of a universal motor is generally reduced by using_________?


agear trains


bV-belts


cbrakes


dchains


View Answer gear trains

Which of the following single-phase motors has relatively poor starting torque ?


a Universal motor


b Repulsion motor


cCapacitor motor


dAll single phase motors have zero starting torque


View Answer Capacitor motor

Which of the following motors can be used for unity power factor ?


aCapacitor run motor


bShaded pole motor


cHysteresis motor


dSchrage motor


View Answer Schrage motor

Which type of load is offered by cranes and hoists ?


aGradually varying load


b Non-reversing, no-load start


cReversing, light start


dReversing, heavy start



The wattage rating for a ceiling fan motor will be in the range_________?


a200 to 250 W


b250 to 500 W


c50 to 150 W


d10 to 20 W


View Answer 50 to 150 W

The wattage of motor for driving domestic sewing machine will be around__________?


a 100 to 150 W


b40 to 75 W


c10 to 30 W


d5 to 10 W


View Answer 100 to 150 W

In case of high speed universal motor which of the following needs more attention?


aEnd play


bAir gap


c Insulation in rotor


d Balancing of rotor


View Answer Balancing of rotor

The repulsion-start induction-run motor is used because of___________?


a good power factor


bhigh efficiency


cminimum cost


dhigh starting torque


View Answer high starting torque

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