Earthing Mcqs
Q.1: The size of the earth or ground wire is based on the______________?C
A. maximum fault current carrying through the ground wire6
B. rated current carrying capacity of the service line3
C. depends on the soil resistance
D. both (A) and (C)
Q.2: 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
Q.3: Factors on which soil resistance depends_______________?8
A. depth of the electrode
B. moisture
C. Nacl
D. all the above
Q.4: The objective of earthing or grounding is_______________?9
A. to provide as low resistance possible to the ground3
B. to provide as high resistance possible to the ground4
C. to provide flow of positive, negative and zero sequence currents@
D. none of the above
Q.5: For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?n
A. to provide low impedance
B. to discharge the charging capacitance to ground/
C. protection for operating personnel"
D. both (B) and (C)
Q.6: 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.
Q.7: Moisture content in the soil __________ the earth soil resistance?B
A. increase
B. decrease
C. does not affect
D. none of the above
Q.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 faultE
D. none of the above
Q.9: Ground resistance should be designed such that_____________?<
A. grounding resistance should be as low as possible1
B. grounding resistance should be as high as possible2
C. grounding resistance should be always zero*
D. none of the above
Q.10: Average resistance of human body is____________?0
A. 500 ohms
B. 1000 ohms
C. 1500 ohms
D. 2000 ohms

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