EARTHING - Practice Mode

1) What is the purpose of system earthing?

To maintain ground at zero potential To reduce the load current To protect the equipment from over load To reduce the losses

Correct Answer: To maintain ground at zero potential

2) Why earth resistance value required to keep very low?

For quick current flow For easy measurement For low power consumption For low voltage drop

Correct Answer: For quick current flow

3) What is the minimum length of the earth electrode pipe?

1.5 metre 2 metre 2.25 metre 2.5 metre

Correct Answer: 2.5 metre

4) What is the minimum size of the copper plate electrode?

30cm to 30cm 60cm X 40cm 60cm X 50cm 60cm X 60cm

Correct Answer: 60cm X 60cm

5) What will happen to the value of earth resistance, if length of the earth pipe is increased?

Remain same Increases Decreases Infinity

Correct Answer: Decreases

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