Earthing or Grounding MCQ

Earthing or Grounding MCQ

  • Admin
  • 17th Apr, 2021

Earthing or Grounding MCQ Test

Following are mostly asked Earthing or grounding MCQ test that are designed for professionals like you to crack you interviews. You can take this Earthing or grounding online test before appearing to you real interview. This Earthing or grounding quiz there are around 30+ multiple choice questions on Earthing or grounding with four options.

1) Moisture content in the soil ______ the earth soil resistance.

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

2) 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 increase.

  • A. True
  • B. False

3) Generally grounding is provided for ______.

  • A. only for the safety of the operating personnel
  • B. only for the safety of the equipment
  • C. Both A and B
  • D. None of the above

4) Factors on which soil resistance depends _____.

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

5) Average resistance of human body is ____ ohms.

  • A. 1700
  • B. 1300
  • C. 1000
  • D. 2300

6) Which metal is used for making an earth wire or ground wire?

  • A. copper
  • B. iron
  • C. aluminium
  • D. galvanized steel

7) The size of the earth or ground wire is based on the ____.

  • A. rated current carrying capacity of the service line
  • B. maximum fault current carrying through the ground wire
  • C. depends on the soil resistance
  • D. Both B and C

8) Solid grounding is addopted for voltages below _______.

  • A. 810V
  • B. 790V
  • C. 660V
  • D. 565V

9) Zero sequence currents in a star connected system without neutral grounding is zero.

  • A. True
  • B. False

10) The advantage of neutral earthing is ___.

  • A. Safety of personnel
  • B. Elemination of arcing ground
  • C. Reduction of earth fault current
  • D. None of the above

11) The color of neutral wire is ______.

  • A. Yellow
  • B. Black
  • C. Blue
  • D. Red

12) Does the underground neutral system lead to arcing ground in case of earth fault.

  • A. True
  • B. False

13) The color of ground wire is ______.

  • A. Black
  • B. Red
  • C. Green
  • D. Yellow

14) The enclosure is connected to ______ in equipment grounding.

  • A. Neutral
  • B. Ground
  • C. Phase
  • D. None of the above

15) Earthing is necessary to give protection against overloading.

  • A. True
  • B. False

16) Earthing is necessary to give protection against danger of electric shock.

  • A. True
  • B. False

17) The earthing rod orientation in the pit should be _____.

  • A. Horizontal
  • B. Vertical
  • C. 45 degree
  • D. None of the above

18) The resistance will _______ by doubling the length of the ground electrode.

  • A. Increase by 50%
  • B. Increase by 40%
  • C. Decrease by 50%
  • D. Decrease by 40%

19) Stakeless measurement is the easiest method for measurement of earth's resistance.

  • A. True
  • B. False

20) ________ is used in earth pit.

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

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