Interview Questions Answers in Electrical Engineering, General Knowledge

Questions / { sukhvinder }

Questions Answers Category Views Company eMail

Answers / { sukhvinder }

Question { Adani, 28182 }

What is the maximum size(MVA)of power transformer available
in the India/world?

Answer

1500 mva seoni (mp).project also starting in Moga (punjab)

Is This Answer Correct ?

3 Yes

9 No

Question { NTPC, 56544 }

What is the rating of HT SUBSTATION and LT SUBSTATION?

Answer

HT (High Tension) substation means if substation is
suppluing power to another substation is called HT
substation.(800/400/220kv,220/132 KV,132/66kv)

LT (low tension)substation means if substation is supplying
power to domestic and industrial usage is called LT SS. It
rating for domestic (66/11/440/0.240 KV) for industrial
(132/66/33) KV.

Is This Answer Correct ?

11 Yes

7 No

Question { MAHINDRA, 17558 }

If connected load of Asphalt plant is 375Kw. What suitable
KVA DG set is required. What is calculation formula. what
extra load have to consider. in what efficiency it will
work.

Answer

connected load=375kw
kva=kw/cos phi
kva=375kw/.8
=468.75

extra load= 20% (assume) i.e 468*20%= 93.6

total 468.75+93.6=543.68 kva say 550kva

eff. 375/550*pf (0.8)*100=85%.

Is This Answer Correct ?

25 Yes

2 No

Question { 7762 }

How does a VOLTAGE OPERATED DIFFERENTIAL RELAY work??

Answer

differential relay which operates on two or more similar
quantities i.e voltage,current.

in this relay under normal condition, no voltage flow
through coil i.e vi+v2=0 but in abnormal the differnce of
two voltage i.e v1+v2 will not equal to zero. so that
voltage will flow through the coil further protection of
equipment/devie/system etc.

Is This Answer Correct ?

4 Yes

5 No

Question { MNC, 117965 }

What are the voltage values for LT,HT,EHT and other
voltages??

Answer

LT upto 440V
HT upto 66 kv
EHT above 66 KV upto 1200 KV (under testing)

Is This Answer Correct ?

41 Yes

29 No

Question { 19891 }

What is the function of the serge absorber?

Answer

surge absorber are used substaions. when surge due to
lightining enter in substaion fron line side surge absorber
provides low resistance path them to ground and prevents
the substaion from these surges.

Is This Answer Correct ?

6 Yes

5 No

Question { 14799 }

why aggregate is placed all around substation ground.

Answer

Gravelling is done to reduce the ground resistance of the
foot from its value.

Is This Answer Correct ?

3 Yes

3 No

Question { 69415 }

Explain RYB?

Answer

RYB is a phase sequence in power system.

R= RED
Y=YELLOW
B=BLUE

Is This Answer Correct ?

155 Yes

8 No

Question { 6092 }

what is ER2 (Monthly return) in EOU? why this return give
to Department?

Answer

it is central excise return.

Is This Answer Correct ?

21 Yes

2 No

Question { 16656 }

Can anyone tell me what will happen if AC & DC supply get
mixed???

Answer

fault in system will occur.

Is This Answer Correct ?

6 Yes

11 No

Question { 42818 }

why the flooring of substation is done with small pebbles or
stones..?

Answer

for reducing the ground resistance of the foot

Is This Answer Correct ?

9 Yes

11 No

Question { Power Grid, 13952 }

1.generator rated as 1000 mva,11kv .8 pf what will 0.8 pf
will indicate?
1.max pf it can supply 2.min pf it can supply
like this 4 options there what is answer.explain

Answer

the above mentioned genrator Ans is 1.

it can supply max. load i.e 0.8 pf means 80 percent of rated

1000*0.8=8MW.

Is This Answer Correct ?

11 Yes

2 No

Question { 32641 }

what is the higest transmission voltage and generated
voltage in india

Answer

1200 KV is under testing.
generation voltage= 11kv

Is This Answer Correct ?

13 Yes

8 No

Question { 8978 }

which motor gives constant speed?

Answer

synchronous motor

Is This Answer Correct ?

21 Yes

0 No

Question { Power Grid, 6075 }

which electrical supply used for long distance traction
1.1-ph 22kv a.c 50hz 2.2-ph 22kv a.c 50 hz
3.dc vtg 4.1-ph 22kv 150 jhz

Answer

2-Ph 22 kv a.c 50hZ

Is This Answer Correct ?

11 Yes

5 No