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

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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

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dIt has high starting torque

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


aworn bearings

✓


b short-circuit in the winding

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copen-circuit in the winding

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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

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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

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b Three-phase series motor

✓


cSchrage motor

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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

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dboth B. and (c)

✓


View Answer both B. and (c)

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