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Company >> NPCIL >> NPCIL Questions
 
 NPCIL technical test questions  NPCIL Technical Test Questions (4)  NPCIL interview questions  NPCIL Interview Questions (23)
 
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Question   which transfofrmer oil break down voltage strength get will be more if oil sample taken from bottom of tank or oil sample taken from top of the transfomer tank. Rank Answer Posted By  
 Interview Question Submitted By :: Rk9163239084
I also faced this Question!!   ALL Interview .com
Answer
oil sample from top which is heated..and bottom oil which is
cool ..so if we take  sample from bottom then that have more
BDV than sample from top.. but practically there is minor
difference .
 
0 Santosh Bangar
 
 
Answer
Depends on density,bottom oil sample have more density than up per side of area transformer.if every where inside the transformer temperature is the same. no more difference.
 
0 R.k.pandey
 
 
Question   which type of packing gives large interfacial area stacked or random? Rank Answer Posted By  
 Interview Question Submitted By :: Amarpatil8888@gmail.com
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Answer
stacked
 
0 Ankit
 
 
 
Answer
Its Random
 
0 Jeni
 
 
Question   extremely urgent please, why a fuse is used before voltmeter but not with a ammeter connected to a CT(current transformer),thanks in anticipation. Rank Answer Posted By  
 Interview Question Submitted By :: Prdp.rautela
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Answer
Because Ameter is cnnected is series with line while 
voltmeter is connected across the phase & neutral. if any 
fault/short circuit occured in line the fuse will cut and 
save the voltmeter and cercuit.
 
0 Npcil
 
 
Answer
look man ... In c.t load is 
connected to the primary 
winding and ammeter is 
connected to secondary 
winding hence there no fuse 
in c.t .... Similary there no fuse 
in potential transformer as 
the voltmeter is connected on 
secondary side with closed 
loop of secondary and 
winding .... P.t is step down 
transformer hence in this also 
no fuse is used .... Its was a 
trick question to measure 
your knowledge
 
0 Syed Shoeb Ullah Hussaini
 
 
Question   to transmit 30kw of power at 30 km what is voltage required Rank Answer Posted By  
 Interview Question Submitted By :: Ridham
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Answer
this is the case of short transmission & it will have voltage less than 20 kv.even i marked 33 kv foolishly during exam.
 
0 Shyam
 
 
Question   what effect will 10 milliampere current cause to human body Rank Answer Posted By  
 Interview Question Submitted By :: Ridham23
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Answer
there is dialysis of blood in red blood cell and water if we 
supply this amount of current for 1 min.
 
0 Abhishek
 
 
Question   what is hourly consumption of coal in therma plant Rank Answer Posted By  
 Interview Question Submitted By :: Ridham23
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Answer
Its around 4000 tons per hour...
Source : Wikipedia
 
0 Chandru
 
 
Answer
it depends on the capacity of plant .
 
0 Pkp
 
 
Question   Why ss Steel is not using in RCC concrete. Rank Answer Posted By  
 Interview Question Submitted By :: Selvakumarkknpp
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Answer
stain less steel is hard to desing as we required, and 
economically cost is more.  hard to mould in desired shape
 
0 Pandu
 
 
Answer
because due to concrete is weak in tension
 
0 Vinod
[NPCIL]
 
 
Question   what does a retarder actually when applied in an automobile?? Rank Answer Posted By  
 Interview Question Submitted By :: Ravi Teja Polisetty
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Answer
the engines output is utilized to other accessories like 
compressor, electric dynamos etc and reduce the power to the 
wheels making the vehicle move slowly and when released the 
automobile gains the actual speed ...which in turn enhances 
the efficiency from braking and sudden accelerations..
 
0 Ravi Teja Polisetty
 
 
Question   What is the difference between newtral earthing and body earthing? Rank Answer Posted By  
 Interview Question Submitted By :: Shaheer Ap
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Answer
One is for neutral and the other is for metallic body of the
electrical equipments to remove the leakage voltage or for
protection.
 
0 K.prakashchandra
 
 
Answer
neutral earthing is provided for internal winding faults while equipment earthing is body earthing to give human protection against any leakage current in m/c body....
 
0 Harsh
 
 
Answer
neutral earthing is for to bye pass the leakage current or 
fault current and avoid the system damage .

body earthing is for bye pass the fault current flowing 
through the body ( cover , chain unit , shaft ) of the m/c . 
mainly for to avoid the electric shock from the faulty current
 
0 P.vasudevan
 
 
 
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