Electrical Engineering Interview Questions
Questions Answers Views Company eMail

How much maximum power can be transmitted on 66 KV transmission line?

Konark, NDPL, Torrent Power,

1 4542

how to give earthing in plain?

1533

How good are you in resolving the commercial issues to Employer's advantage?

1850

Why lightning arrester blast in rainy day?

Eco Cement, Mahaveer, MBDL,

1 4656

Motor running trough VFD, if voltage reduced speed will be?

4 3574

What will happen if mains neutral and generator neutral shorted?

Betts, Suzlon,

2 3396

How to calculate incoming cable size for 33KV, 1MVA transformer.

IAC,

1 4485

While HT line put on to activate ACB in low tention panel VCB tripping instantly.why it happens

Engineering,

1558

11KV electrical line going through the forest in cloudy night ,how can we find the direction of line.

Bhel, Cesco, HZL, Nesco,

5 5260

In Energy meter How many rotation Equal to one unit.

3 7730

which type of capacitors using in single phase motors

Vishnu Infra,

1 2366

Am using an electronic digital display to see the RPM of ABB ACS 550 drive, which is showing negative value when the motor & drive in stop mode but it is showing correct value during the run mode. can anyone help me out??

Bala Power Solutions,

2 2547

why m and c are shorted in wattmeter

1 8646

What is the difference between MCCB,ELCB,RCB & MCB

Bhel, HCL, HPL,

2 5133

What does Transformer vector connection Dy11y5 means?

1 3222


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Un-Answered Questions { Electrical Engineering }

Sir, I have applied for the of Assistant.engineer of NPDCL. please send me all AP TRANSCO AND JENCO solved papers of previous exams . I requested send me the papers to my id as soon as possible (rajanikanth_peddi@yahoo.co.in) (This is very urgent) Thank You,

2372


how to calculate the formula of cable size if motor kw is given

1662


Operation of isolators.

1436


A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.

673


Which level of the Transformer oil got dielectric strengh? And why?

1716






we are having 15kw and 3kw motor both can run in same time , instead of using copper we are using ug aluminium cable , 35 sq.mm is suitable for its current carrying capacity..?

1292


CT Ratio of a energy meter connection is Red Phase : 100/5A, yello Phase : 50/5A & Blue phase : 100/5 A what is the overall Multiplication factor

1174


How to detect voltage vector shifting in interconnection protection.

1439


what is the control circuit for operating the clean room air shower

1703


Define unilateral circuit?

670


What happens to a line-frequency of high-frequency transformer when it is first energized/ re-energize?

1703


How 48-relay (incomplete sequence) functions?

3531


what is meant by 3rd hormonics ?

1457


In India the supply voltage is 230 volt A.C. During the negative half cycle phase becomes neutral and neutral become phase? or what will happen during negative half cycle? how the electrons flow during positive and negative half cycle?

1467


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

1635