Electrical Engineering MCQs

Page No. 143

The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____________?


a1 A


b7 A


cunknown


dthe larger of the two


View Answer 7 A

If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is_________________?


a50 mA


b70 mA


c120 mA


d40 mA


View Answer 70 mA

The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________________?


a1.2 W


b4.8 W


c0.3 W


d12 W


View Answer 4.8 W

The size of the earth or ground wire is based on the______________?


amaximum fault current carrying through the ground wire


brated current carrying capacity of the service line


cdepends on the soil resistance


dboth (A) and (C)


View Answer both (A) and (C)

Generally grounding is provided for


aonly for the safety of the equipment


bonly for the safety of the operating personnel


cboth (A) and (B)


dnone of the above


View Answer both (A) and (B)

Factors on which soil resistance depends_______________?


adepth of the electrode


bmoisture


cNacl


dall the above


View Answer all the above

The objective of earthing or grounding is_______________?


ato provide as low resistance possible to the ground


bto provide as high resistance possible to the ground


cto provide flow of positive, negative and zero sequence currents


dnone of the above



For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?


ato provide low impedance


bto discharge the charging capacitance to ground


cprotection for operating personnel


d both (B) and (C)


View Answer both (B) and (C)

When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?


aIncreases


bDecreases


cRemains unaffected


dNone of above


View Answer Increases

Moisture content in the soil __________ the earth soil resistance?


aincrease


bdecrease


cdoes not affect


dnone of the above


View Answer decrease

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