Earthing or Grounding Bank PO MCQ Questions With Answers Quiz Questions

1. What is the color of earth wire?

A Green B Blue C Yellow D Red

2. Generally earthing is provided for

A safety of equipment B safety of operating person C both a & b D None of the above

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

A earthed B connected to low voltage C connected to high voltage D not connected

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

A Earth resistance B Current C Voltage D None of the above

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

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

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

A 3M B 2M C 5M D 1M

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

A Earth continuity conductor B Phase C Neutral D None of the above

8. Earthing & Grounding are :-

A Same B Different C Same in some part of India & different in some other part of India D None

9. Moisture content in soil ______ the earth soil resistance

A increases B decreases C does not affect D none of the above

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

A Same thing B Different C Could not be predict D None

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

A 10cm B 100 cm C 50cm D 5cm

12. Identify which is the earthing system?

A Pipe earthing B Plate earthing C Road earthing D Strip earthing

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

A 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 B 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. C To isolate the faulty part of the system due to earth fault by sensing earth fault current D All of the above

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

A Barely perceptible B Painful sensation C Heart paralysis D None

15. Specific resistance of soil is _______

A changes from soil to soil B is constant C depends on the circuit connected to it D depends on the supply voltage

16. When earth faults occurs

A voltage potential at the earth mat increses due to earthing B voltage potential at the earth mat decreses due to earthing C voltage potential at the earth mat remains zero due to earthing D None of the above

17. What is the minimum length pipe earthing electrode?

A 2.75 M B 1.5 M C 2.00 M D 1.00 M

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

A Treated Earth pit B Directly driven earth electrode C Deep bore earth electrode D All of the above

19. What is the size of copper earth plate?

A 60cm x 60cm x 3.18mm B 50cm x 50cm x 3.18mm C 40cm x 60cm x 3.18mm D 65cm x 65cm x 3.18mm

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

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

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

A infinite potential B intermediate potential C zero potential D undefined potential

22. Earth wire or gorund wire is made of

A copper B alunimium C iron D GI