Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is the rating of HT SUBSTATION and LT SUBSTATION?

Sail, NTPC,

11 42097

Assume a condition such that two motors of rating 6.6kv,415v are connected to blower,so tell me which motor draw large current give appropriate reason?

NTPC, Student,

2 4718

What are eddy current and define rms value?

NTPC,

4 6881




Transformer's core is made up of which material and why so?

ABB, NTPC,

10 22310

Draw the line diagram of diffretial relay connected to transformer?

NTPC,

1084

Name different types of fault and which instrument is used to measures earth,short,open cicuit fault?

NTPC, Vijai Electricals,

6 8409

AC current is flowing in a wire in your home how can you measure it(name of the instrument)

TCS, NTPC,

24 10936

How does and Earth Fault Relay operates in DG set control panel?

Cummins, University,

1 3860




1> what r different types of fault in cables? How will u locate and test these faults? 2> why earth wire is provided on top throughout the transmission line. why not only on towers? How much area it can protect? 3> what r different types of transmission losses? How power loss can be minimized? 4> what is the % of power loss on transmission lines?

IOCL,

3 7264

what type of relays used in transformers?

BSNL, APTransco,

24 45437

What will be the capcity of 3 phase DG set require for 25 KVA single phase lighting load?

Supernova,

7 11446

MCB is used for high rating &MCB is used for lower rating.What is technical difference between ACB & MCB?

7 7000

what is MUSS?

HP,

1 7617

what is phase and neutral.

HP, Voltech,

16 51417

what factors to needed while selecting a MCB and MCCB

3 7022


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Un-Answered Questions { Electrical Engineering }

Pl.brief me about Electrical power distribution system from Main generating station to Industry.What is the use of in between station.

729


how to find number of run cable laying[LT side] for transformer & alternator secondary side? [above condition for getting output power transformer to main panel side] give the example.

790


why so maney smaller size capacitor use instead of single Big size capacitor in apfc panel

612


what are symmetrical and non symmetrical components in electrical installation.

777


Batteries used for electrical energy storage are a. Laclanche cells b. Edison cells c. Lead acid cells d.any of the above

435






Why can't we parallel Voltage transformer secondary circuits?

105


HI....HOW CAN BE MESARED THE VALVE OF NEUTRAL GROUND RESISTOR WHIC IS LOCATED AT SWICHGEAR ON GENERATOR SIDE....

738


what will happen if dc is supplied in acb or mccb or other circuit breakers?

230


circuit diagram of trip circuit supervision relay

717


Why slip ring ind. motor power consumption is low compare to induction motor .same 90 kw motor used same load output

442


why 1.7Uo for HV cable Hi pot test?IE standard why?

946


IF I KNOW THE AREA OF CROSS SECTION OFTHE WIRE , WATTAGE OF THE LOAD ,VOLTAGE SUPPLY WHAT IM GIVING TO THE LOAD AND ALSO POWER FACTOR OF LOAD ....... SO GIVE ME FOR WHAT AMOUNT OF CURRENT I SHOULD USE WHICH TYPE OF CABLE?

602


how can we calculate the ampacity of the electrical wire/cable. and what are the factors must be considered. pls. elaborate.

882


Distribution transformer we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral,we can not connect separate body earthing pit to other earthing pit but we do metal glanding in secondary side cable termination in both side, transformer and PCC panel (LT Panel), is this safe for transformer and other equipment?

415


what is the effect of change in supply frequency on load angle of synchronous motor,all other parameters remaining same?

1041