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WorksheetsEARTHING
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Earthing is necessary to give protection against
a)
Danger of electric shock
b)
Voltage fluctuation
c)
Overloading
d)
High temperature of the conductors
2.
Solid grounding is addopted for voltages below
a)
100 V
b)
200 V
c)
400 V
d)
660 V
3.
The advantage of neutral earthing is
a)
Freedom from persistent arcing grounds
b)
Over voltages due to lightning can be discharged to earth
c)
Simplified design earth fault protection
d)
All of the above
4.
The advantage of neutral earthing
a)
Safety of personnel
b)
Reduction of earth fault current
c)
Elemination of arcing ground
d)
None of the above
5.
the size of the earth or ground wire is based on the
a)
maxium fault current carrying through ground wire
b)
rated current capacity of the service line
c)
depends on soil resistance
d)
both a & C
6.
earth wire or gorund wire is made of
a)
copper
b)
alunimium
c)
iron
d)
GI
7.
average resistance of a human body is
a)
500 ohms
b)
1000ohms
c)
1500ohms
d)
2000ohms
8.
generally earthing is provided for
a)
safety of equipment
b)
safety of operating person
c)
both a & b
d)
None of the above
9.
ground resistance should be designed such that
a)
ground resistance should be low as possible
b)
ground resistance should be high as possible
c)
ground resistance should always be zero
d)
None of the above
10.
when earth faults occurs
a)
voltage potential at the earth mat increses due to earthing
b)
voltage potential at the earth mat decreses due to earthing
c)
voltage potential at the earth mat remains zero due to earthing
d)
None of the above
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