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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is the rating of HT SUBSTATION and LT SUBSTATION?

Sail, NTPC,

11 42755

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 4778

What are eddy current and define rms value?

NTPC,

4 6977



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

ABB, NTPC,

10 22831

Draw the line diagram of diffretial relay connected to transformer?

NTPC,

1139

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

NTPC, Vijai Electricals,

6 8539

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

TCS, NTPC,

24 11170

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

Cummins, University,

1 3974



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 7378

what type of relays used in transformers?

BSNL, APTransco,

24 46425

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

Supernova,

7 11605

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

 7 7118

what is MUSS?

HP,

1 7939

what is phase and neutral.

HP, Voltech,

16 52055

what factors to needed while selecting a MCB and MCCB

 3 7134

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Un-Answered Questions { Electrical Engineering }

what is the eight bit unit?

989

what things to be considered when designing UPS

438

what are the steps involved in generator load test?

314

what is the function and use of cable differential protection relay?

1619

what will happen if there is a voltage leakage or current leakage in an electrical train

680




What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

738

state basic meaning of 'INDUSTIAL AUTOMATION'?

576

Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere

383

what is circuit recombiner and how it is different from circuit breaker

613

what is difference between isolation and ultra isolation transformer?, what is the method of testing ?

2545

what is the difference between rectifier and converter and commudator?

519

Usage of flywheel diode in relays

554

How many capacitors using in LT panel as per Govt rules?

712

HOW THE OLTC TRANSFORMER SAVE ENERGY IN COMPARISON TO OFF LINE TRANSFORMER AND IS IT ECONOMICAL TO REPLACE THE OFF LINE TRANSFORMER TO OLTC TRANSFORMER

880

WHAT SHOULD BE THE BEST CURRENT RATINGS (PRIMARY / SECONDARY)FOR A CT INSTALLED AT THE INCOMING 11KV PANE? WILL IT BE CALCULATED ON THE BASES OF MAXIMUM DEMANT VALUE OR ON SUM OF ALL TRANSFORMER'S KVA? NOMALLY MAX DEMAND REPRESENT THE MAXIMUM OPERATING LOAD OF THE PLANT AND TOTAL KVA OF (SAY 5 NUMBERS TRANSFORMERS) REPRESENT THE CONNECTED LOAD. WHICH i.e. MAX DEMAND KVA OR CONNECTED KVA ARE BETTER TO USE FOR CT CURRENT CALCULATION? PLEASE ANSWER.

610

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