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Electrical Engineering
Earthing Or Grounding
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Q.1
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.2
The objective of earthing or grounding is
to provide as low resistance possible to the ground
to provide as high resistance possible to the ground
to provide flow of positive, negative and zero sequence currents
none of the above
Q.3
Factors on which soil resistance depends
depth of the electrode
moisture
Nacl
all the above
Q.4
When earth fault occurs
voltage potential at the earth mat increases due to grounding
voltage potential at the earth mat decreases due to grounding
voltage potential at the earth mat remains zero irrespective of fault
none of the above
Q.5
Average resistance of human body is
500 ohms
1000 ohms
1500 ohms
2000 ohms
Q.6
Earth wire or ground wire is made of
copper
aluminium
iron
galvanized steel
Q.7
Average resistance of a human body is
500 ohms
1000ohms
1500ohms
2000ohms
Q.8
True or FalseAfter performing an insulation resistance test, the insulation was deemed low. This is perfect for the insulation
True
False
Q.9
True or FalseA continuity tester may be used when performing a polarity test.
True
False
Q.10
True or FalseThe Ohmmeter may be used for the continuity test
True
False
Q.11
True or FalseAll lamps are removed when carrying out an insulation resistance test.
True
False
Q.12
What test is done to find out if there are breaks in a circuit?
Voltage
Continuity
Resistance
Polarity
Q.13
The preferred method of testing RCD's are:
Built-in test button
Use of RCD Tester
Use of Multimeter
Use of Ohmmeter
Q.14
What is an earth electrode?
electrode that is connected to earth
material used for earthing
electrode connected to the circuit
electrode which is connected to the mains
Q.15
What is earthing?
connecting electrical machines to earth
providing a connection to the ground
connecting the electrical machines to the source
providing a source of current
Q.16
Fuse wire should possess
High specific resistance and high melting point
High specific resistance and low melting point
Low specific resistance and low melting point
Low specific resistance and high melting point
Q.17
Which of the following reduces the earth's resistivity
Salt
Lead
Copper
Earth
Q.18
A process that uses instruments to obtain readings or identify faults is one description of
Testing
Inspection
Spot Checking
Measurement
Q.19
A visual inspection of a new installation is carried out:
During the installation process
to detect open and short circuits
After all tests are completed
upon completion but before testing.
Q.20
Which of the following earthing systems has the path for earth leakage currents via the earth itself:
TN-S
TNC-S
TN-C
TT
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