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Wireman
EARTHING
Set 1
Set 1
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Q13870
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What is the purpose of system earthing?
A
To maintain ground at zero potential
B
To reduce the load current
C
To protect the equipment from over load
D
To reduce the losses
Q13871
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Why earth resistance value required to keep very low?
A
For quick current flow
B
For easy measurement
C
For low power consumption
D
For low voltage drop
Q13872
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What is the minimum length of the earth electrode pipe?
A
1.5 metre
B
2 metre
C
2.25 metre
D
2.5 metre
Q13873
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What is the minimum size of the copper plate electrode?
A
30cm to 30cm
B
60cm X 40cm
C
60cm X 50cm
D
60cm X 60cm
Q13874
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What will happen to the value of earth resistance, if length of the earth pipe is increased?
A
Remain same
B
Increases
C
Decreases
D
Infinity
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