Interview Questions Answers in Electrical Engineering

Questions / { nilkanth askand }

Questions Answers Category Views Company eMail

What differance between Circuit brekar and Isolater?

TATA,

14 Electrical Engineering 20105

Answers / { nilkanth askand }

Question { 9314 }

Can u tell me the name of books of transformer testing?

Answer

You also used Electrical Tecnology from B.L.Thareja & Power
System is best books for transformer protction&Testing.

Is This Answer Correct ?

2 Yes

5 No

Question { 10157 }

What is the difference between Neutral and Eatrh?

Answer

Earth is use for only protection purpose nutral is live
phase if short circuit occur this is protect by earth.

Is This Answer Correct ?

4 Yes

5 No

Question { 22787 }

How regulator control the fan speed?

Answer

when we decrese the fan speed then we decrese regulator by
one step then resistance in the circuit will also increse
then fan speed is decrese

Is This Answer Correct ?

7 Yes

21 No

Question { 14496 }

What is the breakdown voltage?

Answer

This voltage is the viltage at which the insulation is
brekdown this is called Brekdown Voltage.

Is This Answer Correct ?

2 Yes

0 No

Question { HP, 8512 }

please explian how may types of maintenance works.

Answer

Fowlling types of maintenance
1.weekly maintenance
2.monthely maintenance
3.quartarly maintenance
4.yearly maintenance

Is This Answer Correct ?

7 Yes

13 No

Question { NTPC, 20962 }

what are the types of sus station ?

Answer

There are mainly three types of sub-stations.
1.step up/down substations-where stepping up or stepping
down of voltage has done.
2.power factor improvement sub station-where power factor
is improved by installing capacitor banks or synchronous
condensors.
3.switching sub stations- Where switching action like
switching on or off has done for maintenance purposes for
other reasons.
4.poll mounted substation, Underground substation

Is This Answer Correct ?

31 Yes

4 No

Question { BSNL, 61117 }

what type of relays used in transformers?

Answer

you used Buchholz relay but as additional protection you
can used overcurrent relay and also used Winding tempreture
indicator and oil temperature indicator.

Is This Answer Correct ?

104 Yes

7 No

Question { HP, 46540 }

Explain the working principle of Vacuum circuit breaker and
Air circuit breaker

Answer

Vaccum C.B. working principle is that Arc quenching medium
is air our vaccum when fault occur then C.B.works because
of arc making by vaccum

Is This Answer Correct ?

35 Yes

98 No

Question { Bosch, 34934 }

How can w select the cable size for different rating load
& also waht r factors affecting the during selection of
cable?

Answer

Cable size depend upon the full load current rating.Suppose
current rating is 86A then csble size is 35 SQMM.The
factores are the cunductor size and used cunductor

Is This Answer Correct ?

54 Yes

41 No

Question { 9552 }

Can anybody explain Why starters are not used for motor
starting in industries?

Answer

IN industries rating of motor is very high and there is
high voltage is used there for high starting current is
required.thats why starter is not used in industres.

Is This Answer Correct ?

2 Yes

12 No

Question { Wipro, 25285 }

What is the use of conservater, bucchos relay, breather in
a transformer?

Answer

The Buccholz relay used in transformer for only protection
porpuse.conservater for cooling purpose and breather for
oil storage in oil cooling transformer

Is This Answer Correct ?

17 Yes

123 No

Question { 6691 }

what are cable earthing and bus earthing trucks?when and
where they are used?

Answer

Earthing trucks mainly used in HT side to prenent earth
fault.when fault occures huter in the trucks oparate and
prevent the damage to the panel

Is This Answer Correct ?

0 Yes

18 No

Question { 22391 }

WHAT IS DC COMPONENT IN CIRCUIT BREAKER?

Answer

In circuit brekar motor used for spring charging is DC
motor 110v DC.

Is This Answer Correct ?

8 Yes

33 No

Question { 5850 }

depending on what we can choose the rate of mccb
considering that we know the total load

Answer

Rateing of MCCb to selected as follow if your load is 25 KW
then MCCB rating is 25x1.74=43.5A.
For any electrical details send Question on
nilkanth_050372@yahoo.com

Is This Answer Correct ?

1 Yes

0 No

Question { Mantri, 87121 }

working principle of UPS

Answer

UPS means uninterupted supply for computer and electronic
devices.In the UPs one filter is use which mentained the
supply constantaly.There is Two types of UPs On line ups
and OFF line UPs.

Is This Answer Correct ?

168 Yes

76 No