Practice MCQ Questions and answers on Earthing or Grounding Mcqs

A. 500 ohms

B. 1000 ohms

C. 1500 ohms

D. 2000 ohms

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

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

A. increase

B. decrease

C. does not affect

D. none of the above

A. Increases

B. Decreases

C. Remains unaffected

A. to provide low impedance

B. to discharge the charging capacitance to ground

C. protection for operating personnel

D. both (B) and (C)

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

A. depth of the electrode

B. moisture

C. Nacl

D. all the above

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

A. maximum fault current carrying through the ground wire

B. rated current carrying capacity of the service line

C. depends on the soil resistance

D. both (A) and (C)