What is the minimum length pipe earthing electrode?
2.75 M
1.5 M
2.00 M
1.00 M
Q.3.
What is the color of earth wire?
Green
Blue
Yellow
Red
Q.4.
What is the color of earth wire?
Green
Blue
Yellow
Red
Q.5.
What is the diameter of pipe earthing electrode?
40mm
30mm
25mm
60mm
Q.6.
What is the minimum distance of two earth electrode?
3M
2M
5M
1M
Q.7.
Charcoal and salt layer reduce.....................................
Earth resistance
Current
Voltage
None of the above
Q.8.
Three pin sockets thicker pin should be connect to...........................
Earth continuity conductor
Phase
Neutral
None of the above
Q.9.
Which one of the following supply systems would have three live conductors and a neutral?
4 phase
3 phase
2 phase
Single phase
Q.10.
What should be the value of earthing resistance for large power stations?
1 Ω
0.5 Ω
2 Ω
5 Ω
Q.11.
Specific resistance of soil is _______
changes from soil to soil
is constant
depends on the circuit connected to it
depends on the supply voltage
Q.12.
Earth electrode provides ___________
high resistance
medium resistance
low resistance
very high resistance
Q.13.
After earthing, the different parts of an electrical machinery are at ________
infinite potential
intermediate potential
zero potential
undefined potential
Q.14.
In a three phase system, the neutral is _________
earthed
connected to low voltage
connected to high voltage
not connected
Q.15.
How is the condition of an earth electrode measured?
by measuring the voltage
by measuring the current
by measuring the power
by measuring resistance
Q.16.
Minimum distance of underground cable form the foundation of a building should be
10cm
100 cm
50cm
5cm
Q.17.
Moisture content in soil ______ the earth soil resistance
increases
decreases
does not affect
none of the above
Q.18.
Which of the following are the Type of Earth Electrodes :-
Treated Earth pit
Directly driven earth electrode
Deep bore earth electrode
All of the above
Q.19.
Which of the following are the ADVANTAGES OF EARTHED SYSTEM :-
The system earthing (solidly or through a resistance or impedance) is done to provide a return path of earth fault current, which in turn helps
To reduce the insulation requirement of phase elements of equipment connected in that voltage level & cost of the equipment/s in turn. VIZ: Earthed grade cables are less costly than unearthed grade cables.
To isolate the faulty part of the system due to earth fault by sensing earth fault current
All of the above
Q.20.
Which of the following is the purpose of System Earthing ?
Controls Voltage to ground to specified limits.
Limits voltage stress on Insulation of conductors
Provides path for flow of currents during Fault
All of the above
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