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MCQs

Total Questions : 21 | Page 2 of 3 pages
Question 11. The size of the earth or ground wire is based on the
  1.    maximum fault current carrying through the ground wire
  2.    rated current carrying capacity of the service line
  3.    depends on the soil resistance
  4.    both (A) and (C)
 Discuss Question
Answer: Option D. -> both (A) and (C)
Question 12. Average resistance of human body is____________?
  1.    500 ohms
  2.    1000 ohms
  3.    1500 ohms
  4.    2000 ohms
 Discuss Question
Answer: Option B. -> 1000 ohms
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 13. When earth fault occurs______________?
  1.    voltage potential at the earth mat increases due to grounding
  2.    voltage potential at the earth mat decreases due to grounding
  3.    voltage potential at the earth mat remains zero irrespective of fault
  4.    none of the above
 Discuss Question
Answer: Option A. -> voltage potential at the earth mat increases due to grounding
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 14. For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
  1.    to provide low impedance
  2.    to discharge the charging capacitance to ground
  3.    protection for operating personnel
  4.    both (B) and (C)
 Discuss Question
Answer: Option D. -> both (B) and (C)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 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____________?
  1.    Increases
  2.    Decreases
  3.    Remains unaffected
 Discuss Question
Answer: Option A. -> Increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 16. Moisture content in the soil __________ the earth soil resistance?
  1.    increase
  2.    decrease
  3.    does not affect
  4.    none of the above
 Discuss Question
Answer: Option B. -> decrease
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 17. Factors on which soil resistance depends_______________?
  1.    depth of the electrode
  2.    moisture
  3.    Nacl
  4.    all the above
 Discuss Question
Answer: Option D. -> all the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 18. Ground resistance should be designed such that_____________?
  1.    grounding resistance should be as low as possible
  2.    grounding resistance should be as high as possible
  3.    grounding resistance should be always zero
  4.    none of the above
 Discuss Question
Answer: Option A. -> grounding resistance should be as low as possible
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 19. The objective of earthing or grounding is_______________?
  1.    to provide as low resistance possible to the ground
  2.    to provide as high resistance possible to the ground
  3.    to provide flow of positive, negative and zero sequence currents
  4.    none of the above
 Discuss Question
Answer: Option A. -> to provide as low resistance possible to the ground
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 20. Generally grounding is provided for
  1.    only for the safety of the equipment
  2.    only for the safety of the operating personnel
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (A) and (B)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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