Electrical Engineering Interview Questions

how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.

OPS,

1765

what are the different sizes of U.G. cable & where these cabl;es are used according to voltage ..

HPCL,

1672

WHICH SIZE A.B.CABLE IS USED FOR 11KV.

1774

Can anyone send details regarding motor protection relays ? their manuals please ?

2376

How is a capacitor bank is designed ?

8740

We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

1573

HOW DOES THE PERCENTAGE DIFFERENTIAL PROTECTION WORK IN POWER TRANSFORMER

5561

Can the output voltage of a rectifier be greater than the input AC voltage without the use of any voltage multiplier in the circuit??please provide the explanation too..

IOCL,

1664

what is meant by oil filled power & distrubution transformer ? if anybody know the link of detail about above transformers means plz send it i have interview on this week ? plz help me

4168

WHAT IS RMU & HOW IT WORK,IT USEFUL FOR HT OT LT POWER DISTRIBUTION MAUFACTUERE IN INDIA.

10900

22kV HT incoming should be 3 phase or 4 phase? why is it not 4 phase?

3574

A 200W,230V lamp is connected across 115V supply.The lamp will draw power?

SJVN, TCS,

31117

how we can set the IDMT relay.

1688

for high freq ac,why we first convert AC to DC and then DC to high freq.AC

1643

with the help of drive can we run the 50hz motor on 100hz,what will be its effect.

BPL,

8475

Un-Answered Questions { Electrical Engineering }

what is metering cum synchronizing panel and how it is used?

4010

1.what is difference in maintain Hz again Hz in USA ? 2.how to calculate the battery AH? 3.why are yearly maintained in transformer how many tests in required?

2247

How to calculate the phase to phase clearness of HT /// LT bus bar?????

1622

stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate

2218

If the line voltage is reduced to 75% of its rated value then by what percentage current will reduce ?? 75% 25% 50% no change and why ?

1768

Merits & Demarits of Oil circuit & Air circuit breakers ?

1632

can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?

1283

What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?

1639

what is the function of statics switch in ups and tell me parts

1546

Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

1403

What is installed in PAC that is control the humidity

1073

write a c++ code that receives an integer number and display the sum of the number and its revers integer?

1592

how desiel generate sart fail of eb?

1683

What type of DC motor would you see for a lift?

665

why single phase to grd test in HV cable?why not 2 phase at a time?

1838