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Electrical Engineering
Earthing Or Grounding
Quiz 3
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Q.1
Which of the following is not the type of earthing :-
System Earthing
Equipment Earthing
earthing device
None
Q.2
"Soil resistivity" & “Resistance” are :-
Same thing
Different
Could not be predict
None
Q.3
"Soil resistivity" & “Resistance” are :-
Same thing
Different
Could not be predict
None
Q.4
Physiological Effects of 4 A AC Current in Human Body:-
Barely perceptible
Painful sensation
Heart paralysis
None
Q.5
Earthing & Grounding are :-
Same
Different
Same in some part of India & different in some other part of India
None
Q.6
Which of the following is not correct about Earthing :-
To provide a sufficiently low impedance path to facilitate satisfactory Protective system operation under fault conditions.
To ensure that living beings are not exposed to unsafe potentials
It is not possible to operate the electrical system without Earthing
None
Q.7
Earth wire or gorund wire is made of
copper
alunimium
iron
GI
Q.8
Generally earthing is provided for
safety of equipment
safety of operating person
both a & b
None of the above
Q.9
When earth faults occurs
voltage potential at the earth mat increses due to earthing
voltage potential at the earth mat decreses due to earthing
voltage potential at the earth mat remains zero due to earthing
None of the above
Q.10
Which one of the following is used in earth pit:
Aluminum and Iron
Graphite and Silver
Graphite and magnesium
Salt and charcoal
Q.11
The earthing rod orientation in the pit should be:
45°
Horizontal
Vertical
75°
Q.12
The earth's potential is taken as
infinite
supply voltage
1 volt
zero
Q.13
The size of the earth or ground wire is based on the
maximum fault current carrying through the ground wire
rated current carrying capacity of the service line
depends on the soil resistance
both (A) and (C)
Q.14
Earth wire or ground wire is made of
copper
aluminium
iron
galvanized steel
Q.15
Average resistance of human body is
500 ohms
1000 ohms
1500 ohms
2000 ohms
0 h : 0 m : 1 s
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