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Wireman
EARTHING
Set 3
Set 3
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Q13880
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Which instrument is used to measure earth resistance?
A
Megger
B
Ohm meter
C
Wheatstone bridge
D
Earth tester
Q13881
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What principle earth tester works?
A
Potential dividing method
B
Fall of potential method
C
Fall of resistance method
D
Current dividing method
Q13882
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What is the reason for supplying AC to the electrodes for measuring earth resistance?
A
AC is easily available
B
Protect the coils in the meter
C
Reduce the value of current in the meter
D
Avoid the effect of electrolytic Emf interference
Q13883
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How many primary winding required in ELCB?
A
One primary winding
B
Two primary windings
C
Three primary windings
D
Four primary windings
Q13884
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What is the purpose of the ELCB?
A
Control the fault circuit current
B
Protect the residual current
C
Protect the equipment from over load
D
Protect the circuit from short circuit
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