Electrical Engineering MCQs

Page No. 255

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?


amotor will not come up to speed


bmotor will not carry the load


ccurrent drawn by the motor will be excessively high


delectrolytic capacitor will, in all probability, suffer break down



Which of the following statements regarding two value capacitor motor is incorrect ?


aIt is a reversing motor


bIt is preferred to permanent-split single-value capacitor motor where frequent reversals are required


cIt has low starting as well as rushing currents


dIt has high starting torque



If a single phase induction motor runs slower than normal, the most likely defect is_____________?


aworn bearings


b short-circuit in the winding


copen-circuit in the winding


dnone of the above


View Answer worn bearings

Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________?


ait is comparatively cheaper


b it has almost non-destructible capacitor


cit has low starting as well as running currents at relatively high power factor


d it is quiet in operation



Which of the following motors is used in tape-recorders ____________?


aHysteresis motor


bReluctance motor


c Capacitor-run motor


dUniversal motor


View Answer Hysteresis motor

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________?


amagnetic relay


bthermal relay


ccentrifugal switch


dnone of the above


View Answer magnetic relay

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


a30 to 40


b 70 to 80


c80 to 90


d100


View Answer 70 to 80

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


a Induction motor


b Three-phase series motor


cSchrage motor


dHysteresis motor



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


aHysteresis motor


bSchrage motor


c Universal motor


dReluctance motor


View Answer Schrage motor

In repulsion motor, zero torque is developed when___________?


abrush axis is 45° electrical to field axis


bbrush axis coincides with the field axis


cbrush axis is 90° electrical to field axis


dboth B. and (c)


View Answer both B. and (c)

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