Interview Questions Answers in Electrical Engineering

Question { 2359 }

ELCBs are installed for protecting humans from AC leakage
current.Is there a device which protects humans from DC
Leakage current??e.g.leakage from batteries...If not,then why
so???

Answer

Battery supply is for protection and operation

Is This Answer Correct ?

0 Yes

2 No

Question { 3036 }

For 132 KV line, PT or CVT which is prefered for measuring
& protection? is there any IS or IEE standard available?

Answer

For both protection and accurate measurement PT is used with
separate cores . For protection and apprx measurement CVT
is used

Is This Answer Correct ?

0 Yes

0 No

Question { Syndicate Bank, 2779 }

I have been short listed for sydicate clerkcal post .i have
interview on 15th sept..i want to ask if i don't know
kannada to read and write they won't allow me to attend the
interview?Do send u r reply.......

Answer

Don't worry you will be allowed to appear for interview as
they have branches all over India

Is This Answer Correct ?

3 Yes

3 No

Question { HCL, 1991 }

why field winding in synchronous machine connecting in star
position?

Answer

Mainly ,to save on insulation

Is This Answer Correct ?

0 Yes

0 No

Question { 7516 }

what is ground clearence ,what is minimum ground clearence
,i.e present value following in india ,is it changes wit
conductor size ,kva rating.surface

Answer

Clearance depends on voltage only. For the minimum
clearances to be maintained, refer to IE rules 1956

Is This Answer Correct ?

0 Yes

1 No

Question { HPCL, 2108 }

yesterday i am using my laptop by plugging power supply
also battery was working properly
after while i unplugged AC power source ,using my battery
i played car game (use much power)
after that the battery finished the charge and it closed my PC.
after that my battery not charge (when unplug
automatically PC will turn off)

Answer

Replace the battery , it has been discharge beyond recovery

Is This Answer Correct ?

0 Yes

0 No

Question { BARC, 2756 }

how to change the load sharing between two synchronized
identical alternators when both are running with Diesel
engine? assume both are feeding to same feeder?

Answer

Fuel input decides the load . If gen has to share more load ,try to increase the speed.

Is This Answer Correct ?

0 Yes

5 No

Question { Bajaj, 6591 }

What is the meaning of EDO in DG panels?

Answer

Electrically draw(n) out (for the breaker)

Is This Answer Correct ?

1 Yes

0 No

Question { 2524 }

why total tape position are odd in number in Power
transformer ?

Answer

The middle tap is ' normal' and there are equal number of
taps for 'raise' and 'lower'

Is This Answer Correct ?

1 Yes

0 No

Question { 4435 }

Why insulation layer of a High Voltage cable is more than a
current carrying cable?

Answer

Thickness of insulation is decided by the voltage, for the
given insulating material

Is This Answer Correct ?

0 Yes

0 No

Question { Wipro, 4945 }

what is load cell

Answer

Electronic weighing machine

Is This Answer Correct ?

0 Yes

0 No

Question { 3318 }

can we share mvar in parrelell connected alternators

Answer

By varying the excitation (pf)

Is This Answer Correct ?

0 Yes

0 No

Question { 2985 }

A 3PH MOTOR RUNNING IN NORMAL CONDITION AND ITS AMPERE ALSO
UNDER ITS FULL LOAD CURRENT,ITS CABLE RATINGS ALSO HIGER
THN ITS CAPACITY,BUT ITS CABLE GETTING ABNORMAL HEAT(NOT
TOO HOT)WHY ITS GETTING HOT LIK THIS

Answer

Cable quality may not be good or loose connection at the
terminals. If you earth the armour at both the ends there is
a likelihood

Is This Answer Correct ?

0 Yes

0 No

Question { HCL, 5840 }

why motors are rated in HP?

Answer

Its output is mechanical, not electrical

Is This Answer Correct ?

1 Yes

0 No

Question { Chemplast, 3161 }

Why usually in all electrical equipment taking more current
in Y pahse like pumps,compressor,or any other applications

Answer

Magnetic path of the middle phase is shorter than the other two

Is This Answer Correct ?

0 Yes

0 No

k.prakashchandra