Electrical Engineering MCQs

Page No. 262

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


atorque will increase


b the motor will consume less power


cmotor will run in reverse direction


dmotor will continue to run in same direction



Short-circuiter is used in_____________?


arepulsion induction motor


b repulsion motor


crepulsion start induction run motor


dnone of the above



The range of efficiency for shaded pole motors is______________?


a95% to 99%


b80% to 90%


c50% to 75%


d5% to 35%


View Answer 5% to 35%

Burning out of winding is due to___________?


ashort circuited capacitor


bcapacitor value hiving changed


copen circuiting of capacitor


dnone of the above



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


arunning winding only


bstarting winding only


ceither A. or (b)


dboth A. and (b)


View Answer either A. or (b)

Which of the following motors is inherently self starting ?


aSplit motor


bShaded-pole motor


cReluctance motor


d None of these


View Answer Shaded-pole motor

The direction of rotation of an hysteresis motor is determined by____________?


ainterchanging the supply leads


bposition of shaded pole with respect to main pole


cretentivity of the rotor material


d none of these



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______________?


astart and then stop


bstart and run slowly


cstart and run at rated speed


d not start at all


View Answer not start at all

Which of the following motors is used in mixies ?


aRepulsion motor


bReluctance motor


cHysteresis motor


d Universal motor


View Answer Universal motor

In a single phase motor the centrifugal switch____________?


adisconnects auxiliary winding of the motor


bdisconnects main winding of the motor


creconnects the main winding the motor


d reconnects the auxiliary winding of the motor



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