Interview Questions Answers in Electrical Engineering

Question { Indian Military Services, 16201 }

How can you justify a fully carged battery by physical
checkup ?

Answer

in the case of battery

we want to know how the batteries are fully charged
we need to monitoring of three parameters of battery
1) specific gravity value range 1195-1220
2) Temperature not exceed 40-42 celsisus
3) Voltage

if these three value are constant in three hours monitoring
ur batteries are fully charged

i got this experience

Is This Answer Correct ?

1 Yes

0 No

Question { 18606 }

What is meant by TAN-DELTA test carried out in motors?

Answer

u mean what is tan delta ???

tan delta is dissipation/loss factor of insulation
we want to know what is condition of insulation in
equipment

and u want to know more detailes mail me

malavtrivedi2002@gmail.com

Is This Answer Correct ?

14 Yes

2 No

Question { 4968 }

What is OT in a transformer, specify its function.

Answer

OT means OIL Temperature

we want to know OIL temperature of equipment during its
working , its range is 45-50 degree celcius

Is This Answer Correct ?

2 Yes

1 No

Question { 5132 }

lead acid battery electrolity?

Answer

Electrolyte is H2SO4
that concentrated sulphuric acid
which complete the circuit thruogh anode and cathode
which we are used in battery
anode is Pb and cathode is Pbo2

Is This Answer Correct ?

1 Yes

1 No

Question { 41778 }

In neutral the current will flow or not?

Answer

Is This Answer Correct ?

0 Yes

6 No

Question { L&T, 25070 }

In india the power supply is always in multiple of 11,
eg.220 V, 440 V...
what is the reason?

Answer

because in generation side
genrator generate the 11kV voltage

Is This Answer Correct ?

1 Yes

22 No

Question { 8138 }

what is the workimg of ct &pt?

Answer

ct and pt both we are using for protection

Is This Answer Correct ?

0 Yes

1 No

Question { 21263 }

voltage at generation stage is usually- ?

a.11kv b.33kv c.66kv d.220kv

Answer

the voltage generation level is always
11kV ,20kV ,6.6kV
Not more than this after generate this level
we step up this voltage to 33kV,66kV,220KV

Is This Answer Correct ?

2 Yes

4 No

Question { 4586 }

what is O.T?specify the acceptable range?

Answer

it is not OT

it is OTI (oil temperature indicator )
which we are using in transformer to knnow the temperature
in transformer tank which is controlled by radiator
its temperature limit is 50 degree celcius

Is This Answer Correct ?

3 Yes

0 No

Question { 4934 }

which level of transformer oil has got low dielectric
strength ?why?

Answer

if oil has low dielectric strength , ur transformer is in
warning condition ,

why ?? because of in transformer , there is high voltage
winding , it create high temperature , oil is dielectric
medium of two windings , if dielectric strength is low
that means ur oil has moisture content , and it is also
affect the paper insulation of transformer winding

so dielectric strength is very important

Is This Answer Correct ?

2 Yes

0 No

Question { 6706 }

what is pressure relief valve in D.G ?state its function?

Answer

in DG

i am answering about transfdormer
PRD (pressure relief device) using also in transformer
the function remain same
when the fault occcures in transformer , the oil pressure ,
tank mechanichal preessure affect the transformer ,
when fault occurs the oil temperature is high , and ur oil
expands and pressure will be increase

so u use the PRD for relese the pressure of transformer

Is This Answer Correct ?

2 Yes

0 No

Question { Areva, 32366 }

What is Ten Delta Test ?

Answer

hello friends

tan delta test is test about reveal the aging of about
Transformers , Bushings , Rotating machines , Reactors
Tan delta and capacitance both we are measured
capacitance reveals the aging of paper insulation and Tan
delta reveals the loss factor

we are applying 2,4,6,8,10 KV for more then 20kV Equipment

Is This Answer Correct ?

12 Yes

4 No

Question { Badve, 102269 }

what should be distance between two electrical earthing pit
as per i.e.e

Answer

1st rod at 15m
2nd rod at 30m

Is This Answer Correct ?

1 Yes

23 No

Question { 11121 }

4-Why we measure the insulation resistance of main core and
frame in spite of that must be connected with ground

before energize the transformer?

Answer

the 2 nd answer is quite right ,

actually we have to know the value of core insulation
its resistance , for its condition ,we have the standads
for it , and match with those value

if there is leakge current , the value should be lesser
we are doing between phase- earth , and phase to phase
so we match the phase to phase value also

Is This Answer Correct ?

0 Yes

0 No

Question { Havells, 10646 }

advantage of cu cable over al cable

Answer

cu has more strength of heat withstand
cu is melt 300 degree celcius and Al is melt at 160 degree
celcius
cu has less resistance
cu has high conductivity

Is This Answer Correct ?

4 Yes

2 No