Interview Questions Answers in Electrical Engineering

Question { 4263 }

1.what is the easiest way to convert AH(ampere hour)to watts?.

Answer

AH represents the stored energy which is equal to V
(battery)*AH watt hrs.

Is This Answer Correct ?

1 Yes

3 No

Question { Bajaj, 4634 }

You required 5A from the transformer but you get 8A. How do
you minimize this?

Answer

The question is not clear as to whether you want to reduce
the current on a tr. If it is not an overloaded ct ,you can
employ an ICT of 8:5 ratio

Is This Answer Correct ?

1 Yes

3 No

Question { 4038 }

power generation unit kw/hr or kw/day ??
please answer me engr_kalam@yahoo.com

Answer

The usual practice is" Kwh for the day".Per day means
average generation.In case of large plants the daily
generation is given in Mwh (1000Kwh)

Is This Answer Correct ?

3 Yes

0 No

Question { 7757 }

Hi,Any one has idea regarding the KPTCL Recuirtments for
AE'e & JE's for the year of 2009-10???Kindly help in
regards..

Answer

The selected have been intimated to exercise option in
respect of JEE's

Is This Answer Correct ?

1 Yes

0 No

Question { 2293 }

why solinoid coil used in tripping rely?and why not other
type coil?

Answer

More force with lower voltage and smaller coil than other types

Is This Answer Correct ?

1 Yes

0 No

Question { 2044 }

what is maximum or Threshold value of current 7 voltage
that a common man can withstand

Answer

Just like threshold of a house i.e. entry or exit point

Is This Answer Correct ?

0 Yes

0 No

Question { Reliance, 3334 }

Why the TNC switch is called as Memory switch

Answer

I think it is called so ,as the closed position remains in memory (( L M D ) to give ' auto trip ' indication .

Is This Answer Correct ?

1 Yes

0 No

Question { Vijai Electricals, 3866 }

Can I use less voltage cable for neutral, since the voltage
of return path is zero ideally?

Answer

It may be subjected to full voltage ,during earth fault

Is This Answer Correct ?

3 Yes

1 No

Question { Vijai Electricals, 3866 }

Can I use less voltage cable for neutral, since the voltage
of return path is zero ideally?

Answer

And also during short circuit

Is This Answer Correct ?

0 Yes

0 No

Question { Crompton Greaves, 23049 }

what is the purpose of battery tap voltage.

Answer

Tap votage is from the battery in 75-80% position so that
this volage is equal to the normal (float charge) voltage
of the battery set, when boost- charging is going on ,so
that DC supply voltage to the appliances is not as high as
boost voltage which could be 30 % more than the rated
volage of the battery set

Is This Answer Correct ?

23 Yes

1 No

Question { Crompton Greaves, 5312 }

what will happen if we use cylindrical conductor instead of
flat cu conductor in transformer

Answer

Winding size increases for gaps between conductors and for
round shape the height will be more. skin effect will be
more.

Is This Answer Correct ?

4 Yes

2 No

Question { 2428 }

why the value of impedence is taken as %impedence in fault
currrent calculation

Answer

Percentage impedance = Full load current x impedance x
100/rated voltage . It is the percentage voltage drop at
full load ,in the tr.

Is This Answer Correct ?

1 Yes

0 No

Question { 2495 }

if we give connection of 100watts bulb through a single
phase energy meter ,the disc of a meter rotates why it
happens?

Answer

Because it is recording consumption of electrical energy

Is This Answer Correct ?

2 Yes

3 No

Question { Orchid, 12855 }

what is the purpose of vector group in a transformer ? if 2
tranaformers r connected in parallel the vector group is
same or not?
for parallel operation 2 transformers of different
manufacturers maintain same vector group or not?

Answer

Vector group of CTs is widely used in numerical relays to
compare primary and secondary currents without regard to
the circuit of the transformer

Is This Answer Correct ?

0 Yes

0 No

Question { 7345 }

WHY LATCHING CURRENT IS GREATER THATN HOLDING CURRENT?

Answer

The coil used for latching has to exert more force to pull or
push the latch and it gets momentarily energized.

Is This Answer Correct ?

2 Yes

3 No

k.prakashchandra