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Professional Development
Professional Development
Earthing & Lightning Protection
8 questions
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- 1. Multiple Choice
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
- 2. Multiple Choice
Earthing & Grounding are :-
Same
Different
Same in some part of India & different in some other part of India
None
- 3. Multiple Choice
Physiological Effects of 4 A AC Current in Human Body:-
Barely perceptible
Painful sensation
Heart paralysis
None
- 4. Multiple Choice
"Soil resistivity" & “Resistance” are :-
Same thing
Different
Could not be predict
None
- 5. Multiple Choice
Which of the following is not the type of earthing :-
System Earthing
Equipment Earthing
earthing device
None
- 6. Multiple Choice
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
- 7. Multiple Choice
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
- 8. Multiple Choice
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
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