Earthing Or Grounding MCQ Questions & Answers

1

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

A) Increases B) Decreases C) Remains unaffected D) none of the above

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Answer & Solution

Answer: Option A

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2

Moisture content in the soil _______ the earth soil resistance

A) increase B) decrease C) does not affect D) none of the above

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Answer & Solution

Answer: Option B

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3

Generally grounding is provided for

A) only for the safety of the equipment B) only for the safety of the operating personnel C) both (A) and (B) D) none of the above

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Answer & Solution

Answer: Option C

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4

Ground resistance should be designed such that

A) grounding resistance should be as low as possible B) grounding resistance should be as high as possible C) grounding resistance should be always zero D) none of the above

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Answer & Solution

Answer: Option A

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5

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

A) to provide low impedance B) to discharge the charging capacitance to ground C) protection for operating personnel D) both (B) and (C)

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Answer & Solution

Answer: Option D

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6

The objective of earthing or grounding is

A) to provide as low resistance possible to the ground B) to provide as high resistance possible to the ground C) to provide flow of positive, negative and zero sequence currents D) none of the above

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Answer & Solution

Answer: Option A

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7

Factors on which soil resistance depends

A) depth of the electrode B) moisture C) Nacl D) all the above

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Answer & Solution

Answer: Option D

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8

When earth fault occurs

A) voltage potential at the earth mat increases due to grounding B) voltage potential at the earth mat decreases due to grounding C) voltage potential at the earth mat remains zero irrespective of fault D) none of the above

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Answer & Solution

Answer: Option A

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9

Average resistance of human body is

A) 500 ohms B) 1000 ohms C) 1500 ohms D) 2000 ohms

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Answer & Solution

Answer: Option B

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10

Earth wire or ground wire is made of

A) copper B) aluminium C) iron D) galvanized steel

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Answer & Solution

Answer: Option D

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Earthing Or Grounding MCQ Questions & Answers | Electrical Engineering