Earthing or Grounding Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Earthing or Grounding”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Earthing or Grounding Mcqs comprehensively.

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2.
Ground resistance should be designed such that_____________?

Grounding resistance should be as low as possible

Grounding resistance should be as high as possible

Grounding resistance should be always zero

None of the above

Answer Discus (0)

3.
When earth fault occurs______________?

Voltage potential at the earth mat increases due to grounding

Voltage potential at the earth mat decreases due to grounding

Voltage potential at the earth mat remains zero irrespective of fault

None of the above

Answer Discus (0)

4.
Moisture content in the soil __________ the earth soil resistance?

Increase

Decrease

Does not affect

None of the above

Answer Discus (0)

5.
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____________?

Increases

Decreases

Remains unaffected

Answer Discus (0)

6.
For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?

To provide low impedance

To discharge the charging capacitance to ground

Protection for operating personnel

Both (B) and (C)

Answer Discus (0)

7.
The objective of earthing or grounding is_______________?

To provide as low resistance possible to the ground

To provide as high resistance possible to the ground

To provide flow of positive, negative and zero sequence currents

None of the above

Answer Discus (0)

8.
Factors on which soil resistance depends_______________?

Depth of the electrode

Moisture

Nacl

All the above

Answer Discus (0)

9.
Generally grounding is provided for

Only for the safety of the equipment

Only for the safety of the operating personnel

Both (A) and (B)

None of the above

Answer Discus (0)

10.
The size of the earth or ground wire is based on the______________?

Maximum fault current carrying through the ground wire

Rated current carrying capacity of the service line

Depends on the soil resistance

Both (A) and (C)

Answer Discus (0)

12.
Ground resistance should be designed such that_____________?

Grounding resistance should be as low as possible

Grounding resistance should be as high as possible

Grounding resistance should be always zero

None of the above

Answer Discus (0)

13.
When earth fault occurs______________?

Voltage potential at the earth mat increases due to grounding

Voltage potential at the earth mat decreases due to grounding

Voltage potential at the earth mat remains zero irrespective of fault

None of the above

Answer Discus (0)

14.
Moisture content in the soil __________ the earth soil resistance?

Increase

Decrease

Does not affect

None of the above

Answer Discus (0)

15.
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____________?

Increases

Decreases

Remains unaffected

Answer Discus (0)

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