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why double earthing is required for welding machine & 
electrical tools.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
# 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 ?    41 Yes 2 No
# 2
for safty purpose only. if one is failure another in line 
Is This Answer Correct ?    18 Yes 3 No
# 3
Double earthing is
used to give
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
# 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

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Based on CPI/CGPA they shortlist the candidates & than directly start Interview so there is no Written Exam or GD Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on 6th,Aug, 2007 & the Questions asked to me by Interview Board ( 4 People) are from HR/SummerTraining/BTP/Subject-core, POWER SYSTEM & MACHINE. time duration of I/V is about 15-20 Minutes. HR- Q.1 Name,hobbies & About family background ? Q2.What u know abt NTPC ?? Q3.Why u want to choose NTPC as ur Carrier's starting i.e power sector not any other Oragnisation or sector ?? Techincal Questions- Q1.What is the reason for transformer Noise ?? Q2.Which material is used for making Transformer oil & How u measure its dielectric strength & Name the test ? Q.3 Which Machine u will prefer 2 use if flammble gases are coming out at a place & why ?? Q4.What is relation b/w Transmission Lines & Communication Lines ? Q5.What is the maximum capacity Synchronus Machine & total powerGeneration in our country ? Q.6 In india Power generation is at 50Hz while in America its 60 hz ,why so ?? Advantage or disadvantage ?? Q.7 Maximum Generation Voltage in india ? Q8. What is the Voltage regulation & why its required n how much is permissible ? & causes of voltage variation ?? Q.9 Why electric shock is feel ?? n in a Electric Train why we didnt feel that ? Q.10 Have u seen/ experience of any power plant/ industry related to the power sector ? so these are the questions which not too diffcult i think was asked to me. NTPC 6
in transformer the unit of power is in kva why? Videocon 4
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