Quiz  /  Earthing or Grounding Bank PO MCQ Questions With Answers

  • 1. 
    What is the color of earth wire?

  • Green
  • Blue
  • Yellow
  • Red

  • 2. 
    Generally earthing is provided for

  • safety of equipment
  • safety of operating person
  • both a & b
  • None of the above

  • 3. 
    In a three phase system, the neutral is _________

  • earthed
  • connected to low voltage
  • connected to high voltage
  • not connected

  • 4. 
    Charcoal and salt layer reduce.....................................

  • Earth resistance
  • Current
  • Voltage
  • None of the above

  • 5. 
    Which of the following is the purpose of System Earthing ?

  • Controls Voltage to ground to specified limits.
  • Limits voltage stress on Insulation of conductors
  • Provides path for flow of currents during Fault
  • All of the above

  • 6. 
    What is the minimum distance of two earth electrode?

  • 3M
  • 2M
  • 5M
  • 1M

  • 7. 
    Three pin sockets thicker pin should be connect to...........................

  • Earth continuity conductor
  • Phase
  • Neutral
  • None of the above

  • 8. 
    Earthing & Grounding are :-

  • Same
  • Different
  • Same in some part of India & different in some other part of India
  • None

  • 9. 
    Moisture content in soil ______ the earth soil resistance

  • increases
  • decreases
  • does not affect
  • none of the above

  • 10. 
    "Soil resistivity" & “Resistance” are :-

  • Same thing
  • Different
  • Could not be predict
  • None

  • 11. 
    Minimum distance of underground cable form the foundation of a building should be

  • 10cm
  • 100 cm
  • 50cm
  • 5cm

  • 12. 
    Identify which is the earthing system?

  • Pipe earthing
  • Plate earthing
  • Road earthing
  • Strip earthing

  • 13. 
    Which of the following are the ADVANTAGES OF EARTHED SYSTEM :-

  • The system earthing (solidly or through a resistance or impedance) is done to provide a return path of earth fault current, which in turn helps
  • To reduce the insulation requirement of phase elements of equipment connected in that voltage level & cost of the equipment/s in turn. VIZ: Earthed grade cables are less costly than unearthed grade cables.
  • To isolate the faulty part of the system due to earth fault by sensing earth fault current
  • All of the above

  • 14. 
    Physiological Effects of 4 A AC Current in Human Body:-

  • Barely perceptible
  • Painful sensation
  • Heart paralysis
  • None

  • 15. 
    Specific resistance of soil is _______

  • changes from soil to soil
  • is constant
  • depends on the circuit connected to it
  • depends on the supply voltage

  • 16. 
    When earth faults occurs

  • voltage potential at the earth mat increses due to earthing
  • voltage potential at the earth mat decreses due to earthing
  • voltage potential at the earth mat remains zero due to earthing
  • None of the above

  • 17. 
    What is the minimum length pipe earthing electrode?

  • 2.75 M
  • 1.5 M
  • 2.00 M
  • 1.00 M

  • 18. 
    Which of the following are the Type of Earth Electrodes :-

  • Treated Earth pit
  • Directly driven earth electrode
  • Deep bore earth electrode
  • All of the above

  • 19. 
    What is the size of copper earth plate?

  • 60cm x 60cm x 3.18mm
  • 50cm x 50cm x 3.18mm
  • 40cm x 60cm x 3.18mm
  • 65cm x 65cm x 3.18mm

  • 20. 
    Why there is no effect of electric shock occurs on the bird?

  • Bird standing on neutral line
  • Both of the bird’s feet touch the same line
  • Both of the bird's feet is high resistance
  • One of the bird's feet is not touch the line

  • 21. 
    After earthing, the different parts of an electrical machinery are at ________

  • infinite potential
  • intermediate potential
  • zero potential
  • undefined potential

  • 22. 
    Earth wire or gorund wire is made of

  • copper
  • alunimium
  • iron
  • GI
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