12th
Apr
Earthing or Grounding MCQ

Earthing or Grounding MCQ

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  • 12th Apr, 2022
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Earthing or Grounding MCQ Questions

Take Earthing or Grounding MCQ Test & Online Quiz to test your Knowledge

We have listed below the best Earthing or Grounding MCQ Questions, that check your basic knowledge of Earthing or Grounding. This Earthing or Grounding MCQ Test contains 20+ Multiple Choice Questions. You have to select the right answer to check your final preparation for the Electrical Engineering Exam/Interviews. apart from this, you can also download the Earthing or Grounding MCQ PDF, completely free from the link given below.

Earthing or Grounding MCQ Test

1) The Soil resistance depends on .......

  • A. Nacl
  • B.Moisture
  • C.Depth of the electrode
  • D.All of the above

2) Ground resistance should be designed such that

  • A. Grounding resistance should be always zero
  • B.Grounding resistance should be as low as possible
  • C.Grounding resistance should be as high as possible
  • D.All of the above

3) The earthing rod orientation in the pit should be:

  • A. 45°
  • B.Horizontal
  • C.Vertical
  • D.75°

4) Which one is the easiest method for earth resistance measurement?

  • A. Fall of potential
  • B.Selective measurement
  • C.Stakeless measurement
  • D.All are equally easy

5) Electrical resistivity is inversely proportional to the depth of grounding / earthing rod into the ground.

  • A. True
  • B.False

6) In any system (grounding or ungrounding), a ____ coupling exist between the system conductors and the adjacent grounding surfaces:

  • A. Capacitance
  • B.Inductance
  • C.Resistance
  • D.None of the above

7) Earthing is necessary to give protection against ___.

  • A. Danger of electric shock
  • B.Voltage fluctuation
  • C.Overloading
  • D.High temperature of the conductors

8) The advantage of neutral earthing is:

  • A. Freedom from persistent arcing grounds
  • B.Over voltages due to lightning can be discharged to earth
  • C.Simplified design earth fault protection
  • D.All of the above

9) Which one of the following is used in earth pit?

  • A. Salt and charcoal
  • B.Graphite and magnesium
  • C.Graphite and Silver
  • D.Aluminum and Iron

10) In a ungrounded system, during the fault the protective relays may not able to operate because of the low fault current:

  • A. True
  • B.False

11) Moisture content in the soil _______ the earth soil resistance.

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

12) 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

13) Which of the following solution is used to reduces the earth’s resistivity?

  • A. Nacl
  • B.Na2SO4
  • C.CaCl
  • D.Ca2CO3

14) Which of the following will damage when High voltages originated due to Line to Ground faults in ungrounded system?

  • A. Insulation damage
  • B.Conductors melt down
  • C.Will not have any effect
  • D.Fires

15) 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

16) Soil resistance depends on:

  • A. depth of the electrode
  • B.moisture
  • C.Nacl
  • D.All of the above

17) Step Potential is associated with the potential between the two feet separated by about 1 meter.

  • A. True
  • B.False

18) Which of the following system produces highest ground fault current when a fault to ground occurs?

  • A. Ungrounded sytem
  • B.Resistance grounding system
  • C.Solid grounding system
  • D.Reactance grounding system

19) Which type of earthing is used by transmission lines?

  • A. Plate earthing
  • B.Rod earthing
  • C.Strip earthing
  • D.All of the above

20) What is earthing?

  • A. connecting electrical machines to earth
  • B.providing a connection to the ground
  • C.connecting the electrical machines to source
  • D.providing a source of current

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