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1) Which instrument is used to measure earth resistance?
Megger
Ohm meter
Wheatstone bridge
Earth tester
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Correct Answer: Earth tester
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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
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Correct Answer: Fall of potential method
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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
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Correct Answer: Avoid the effect of electrolytic Emf interference
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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
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Correct Answer: Two primary windings
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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
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Correct Answer: Protect the residual current
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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
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