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Question
why double earthing is required for welding machine & 
electrical tools.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
to give low resistance and if one earth is out of
order,second will do the required work of earthing the equipment
 
Is This Answer Correct ?    39 Yes 2 No
Divyesh
 
Answer
# 2
for safty purpose only. if one is failure another in line 
Is This Answer Correct ?    17 Yes 3 No
Dinakaran
 
 
 
Answer
# 3
Double earthing is
used to give
minimum
resistance to the
flow of whole
current of the
apparatus in case
of short circuit or
leakage or any
such other fault.
 
Is This Answer Correct ?    15 Yes 1 No
Bilal Mir
 
Answer
# 4
1.For safety of personnel & equipment
2.Reduces voltage fluctuation in case of excess current flow.
3.In case non use of tripping devices it reduces the risk of electrocution.
 
Is This Answer Correct ?    9 Yes 5 No
Pravin
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
Do anyone know how can I calculate earthing for substation or do anyone know any software which I can use for this case   1
how to calculate the ct burden?   1
Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it?   3
In DC motor,the field MMF is given by NI.N-no.of field winding turns,I-excitation and both are constant.Then how could the main flux decreases due to armature reaction. Bhel 3
What will be the minimum megger value of 1700 KVA Transformer? a) Do megger value varies according to climate conditions and area . b) If megger value is 100 mega ohm is it good for new transfomer. Explain?   3
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what is meant by displacement & magnitude ?   2
how to identified power tranfer line is how much KV???? Essar 5
where does the unbalanced current flow in the delta circuit   3
explain about RTCC HAL 2
how to amps calculate from 1KVA?   11
IF 3 NOS.OF HEATERS,3KW CAPACITY EACH,1 NO.HEATER CONNECTED IN R PHASE,1 IN Y PHASE AND 1 IN B PHASE.THEIR END POINTS CONNECTED IN STAR.IF I CONNECT THIS STAR POINT TO NEUTRAL OR DO NOT CONNECT TO NEUTRAL.WHAT WILL THE DIFFERENCE.   3
 
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