WIRING INSTALLATION AND EARTHING - Practice Mode

1) What is the minimum size of Copper earth continuity conductor used in single phase domestic wiring as per BIS?

3 Sq.mm 3.5 Sq.mm 2.5 Sq.mm 1.5 Sq.mm

Correct Answer: 1.5 Sq.mm

Explanation:

2) Which method is used to reduce earth resistance value in a existing earth?

Increasing the length of electrode Keeping wet condition in earth pits always Adding more sand and charcoal in earth pits Increasing the diameter of earth electrode

Correct Answer: Keeping wet condition in earth pits always

3) Why A.C is required to measure the earth resistance by using earth resistance tester?

Regulate the current Increase the voltage drop Decrease the voltage drop Avoid electrolytic emf interference

Correct Answer: Avoid electrolytic emf interference

4) What is the formula to find voltage drop of a A.C single phase wiring circuit?

Voltage drop = IR volt Voltage drop = I<sup2R volt Voltage drop = I/R volt Voltage drop=IR/2 volt

Correct Answer: Voltage drop = IR volt

5) What is the maximum permissible load for a power sub circuit as per I.E rules?

800 Watt 1500 Watt 2000 Watt 3000 Watt

Correct Answer: 3000 Watt

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