Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

is a normal conductor can be used a core in windings if not what is the winding core speciality.

2 4584

can we light the mercury vapour (tube light)with out a 1).starter and 2).choke in our homes if yes explain how?

5 7853

why most of the induction motors are delta connected?

7 27733

Can we connect two or more energy meters/Amp meters on one CT set(Three phase).

Parle, Watermark Engineering,

5 28013

How to calculate the actual 3phase power, if the load current of each phase is not balanced

2 5146

why air handling unit interloking in case of fire

3 6232

How to calculate the KA rating for a circuit breaker if we know the KVA rating of the generator feeding it?

2 18675

1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

2242

11. As per the theory current doesn’t flows in Neutral, but practically it is not applicable, explain why? 12. How to take the Vector Group Test in Transformer? What is the purpose of doing Vector Group Test? 13. Why the transmission lines are in 11kV, 22kV, 33kv, and why not 10kV, 20kV, 30kV? 14. Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it? 15. Explain why the Voltage drop will happen in 3 Phase line? 16. What is the equipment used to control the generator output? 17. What are the factors to be considered during the Synchronization? 18. What should be value of Circuit breaker operating time and tripping time? 19. Why the CT Secondary is rated as 5A generally? 20. At which time Synchronous generator act as a Synchronous Condenser?

1 5662

21. What is the purpose of taking Capacitance and Tan Delta Test in Transformer bushing? 22. What are the protections to be used for Generator? 23. Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0 24. What happens when the polarity changes in CT? Explain briefly? 25. Explain the Term in CT Name Plate – Class: 5P10

3 9357

How to calculate cable size in sq units based on motor rating is KW

2 6672

what is the full form of XLPE adn there use.

Voltas,

4 30733

what is the difference between power transformer & distribution transformer and what are their ratings respectively?

4 8124

what happen if transformer neutral not earth

2 7330

sigal phase supply is 230 v ac two phase supply is 415 v ac then why three phase supply having supply is 415 v ac why not 690v ac

2 5753

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Un-Answered Questions { Electrical Engineering }

Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??

1627

If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.

1588

what is vA rating and class of a ct.

1821

EXPLAIN THE ESSENTIAL FACTORS WHICH INFLUENCES THE CHOICE OF SITE FOR A HYDRO ELECTRIC POWER PLANT

2208

i want some interview related questions with their answers which can help for attend the interviews...

1611

what is the meaning of 5% droop or 7% droop in AVR?

2277

How to calculate the no of Ceiling fan (1200mm sweep) per unit area?

2014

What are the basic component of a cro?

1201

Is it true online ups having bypass mode if it is true then why we called ups because it is interrupting power when goes in bypass mode

1974

The screw thread commonly used for transmission of motion is one of the following types of threads

1112

What is Meter MF if External CT Ratio is 150/1 , PT Ratio is 132/110 Meter CT Ratio is 200/1 & Meter PT Ratio is 110/1

1831

in ACB breaker requireding 3200Amps. buscoupler getting OFF mode and again it reset and getting normal position give me a required answer?

2312

how to define tell me about self

1970

why the starting voltage drop in a cable needs to be limited?what is percentage of the voltage drop allowed during starting?

1776

i am completed in B.E(Electrical and Electronics Engineering) with 8 months experience in Quality Control Engineer at Bharathi Industries,Coimbatore.

1846

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