Electrical Engineering MCQs

Page No. 144

When earth fault occurs______________?


a voltage potential at the earth mat increases due to grounding


bvoltage potential at the earth mat decreases due to grounding


cvoltage potential at the earth mat remains zero irrespective of fault


dnone of the above



Ground resistance should be designed such that_____________?


agrounding resistance should be as low as possible


b grounding resistance should be as high as possible


cgrounding resistance should be always zero


dnone of the above



Average resistance of human body is____________?


a 500 ohms


b1000 ohms


c1500 ohms


d2000 ohms


View Answer 1000 ohms

Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?


a To avoid initial rush of current


bTo avoid change in kW rating with temperature


cBoth (A) and (B)


dEither (A) or (B)


View Answer Both (A) and (B)

It is desirable to operate the arc furnaces at power factor of_____________?


azero


b0.707 lagging


c unity


d0.707 leading


View Answer 0.707 lagging

Ajax Wyatt furnace is started when____________?


a it is filled below core level


bit is filled above core level


cit is fully empty


dnone of the above



Radiations from a black body are proportional to____________?


aT1


b T2


cT3


dT*


View Answer T*

Which of the following methods is used to control temperature in resistance furnaces ?


aVariation of resistance


bVariation of voltage


cPeriodical switching on and off of the supply


dAll of the above methods



In arc furnace the function of choke is______________?


a to stabilize the arc


bto imprpve, power factor


c to reduce severity of the surge


d none of the above



Hysteresis loss and eddy current loss are used in____________?


ainduction heating of steel


b dielectric heating


c induction heating of brass


d resistance heating



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