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

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cvoltage potential at the earth mat remains zero irrespective of fault

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dnone of the above

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Ground resistance should be designed such that_____________?


agrounding resistance should be as low as possible

✓


b grounding resistance should be as high as possible

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cgrounding resistance should be always zero

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dnone of the above

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Average resistance of human body is____________?


a 500 ohms

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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

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bTo avoid change in kW rating with temperature

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cBoth (A) and (B)

✓


dEither (A) or (B)

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View Answer Both (A) and (B)

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


azero

✖


b0.707 lagging

✓


c unity

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d0.707 leading

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View Answer 0.707 lagging

Ajax Wyatt furnace is started when____________?


a it is filled below core level

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bit is filled above core level

✓


cit is fully empty

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dnone of the above

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Radiations from a black body are proportional to____________?


aT1

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b T2

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cT3

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dT*

✓


View Answer T*

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


aVariation of resistance

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bVariation of voltage

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cPeriodical switching on and off of the supply

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dAll of the above methods

✓



In arc furnace the function of choke is______________?


a to stabilize the arc

✓


bto imprpve, power factor

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c to reduce severity of the surge

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d none of the above

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Hysteresis loss and eddy current loss are used in____________?


ainduction heating of steel

✓


b dielectric heating

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c induction heating of brass

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d resistance heating

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