EARTHING - Quiz

1) Which instrument is used to measure earth resistance?

Megger Ohm meter Wheatstone bridge Earth tester

2) What principle earth tester works?

Potential dividing method Fall of potential method Fall of resistance method Current dividing method

3) What is the reason for supplying AC to the electrodes for measuring earth resistance?

AC is easily available Protect the coils in the meter Reduce the value of current in the meter Avoid the effect of electrolytic Emf interference

4) How many primary winding required in ELCB?

One primary winding Two primary windings Three primary windings Four primary windings

5) What is the purpose of the ELCB?

Control the fault circuit current Protect the residual current Protect the equipment from over load Protect the circuit from short circuit