Sunday, December 2, 2012

DRDO Interview Questions for Electrical Engineers


Ramana my Friend's DRDO interview Questions:

Chairman:

1. What are the various experiments you have done in your machines lab
2. How the vibrations are produced from mobile phone when it is in that mode

Departmental Expert-1:

1. Why your eyes are in red colour, don't you have enough sleep yesterday night
2. what is your favorite subject
3. What is meant by zpf... this term is related to which machine
4. What is meant by reluctance motor
5. write the expression for power developed in salient pole synchronous motor?
6. what is meant by load angle in detail
7. Can you explain hunting breafly..?
8. Is there any method to reduce hunting...?
I think you studied power system analysis in your B.Tech....not power systems, power system analysis

9. what are the various quantities required for design of power system
10. Can you tell me the method for power system stability analysis
He gives clue for above question
11. Explain equal area criterion analysis method

Departmental expert-2:

1. this question related to communication subject
2. what is meant by stepper motor
3. how the steps can achieve
4. what is meant by BLDC motor
5. what is the constructional and operational difference between BLDC motor and DC motor
6. without the brushes and commutator how can you achieve the current reversal?
for the above question Departmental Expert-1 gives 50% answer as clue...
7. what is the purposes of commutator in DC machines
8. In diesel engine trains how the exact system is there inside
9. How can we get the supply for fans and lights in trains
10. Name the special generator used for above...?
for this question departmental expert-1 gives full answer

External expert:

1. instead of using AC transmission why we are using HVDC
2. What is the main adv. and dis adv. of HVDC
3. can you learn about the earth fault circuit breaker in houses
4. what is meant by MCB? how it works? which type of CB it is?

Departmental expert-1:

1. apart from the losses, cost etc etc..... the advantage of HVDC over any other....

..................................@@@000@@@...............................

Lastly the departmental expert-1 asks Well Mr. Ramana suppose if you are selected in this job, afterwards you got
other job based on B.Tech (example in ISRO that is also a R&d org.)then what do you do....

K@run@

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  4. Plz provide answers for the above

    ReplyDelete
  5. Answers:dept1
    1.machines lab experiments will be as per your syllabus...
    2.Pizeo-electric crystal in mobile vibrates when small current is passed through it....
    3.ZPF is zero power factor and mainly it can be seen in transformers and synchronous machines...
    4.The variable reluctance motor is based on the principle that an unrestrained piece of iron will move to complete a magnetic flux path with minimum reluctance, the magnetic analog of electrical resistance.
    5.(Ef*Vt*sin@/Xd)+(Vt^2/2(1/Xq-1/Xd)sin2@)
    6.The angle between the stator field axis and rotor on load is called loadangle..
    7,8.http://mediatoget.blogspot.in/2011/04/what-is-meant-by-hunting-in-synchronous.html
    9.P,Q,S,Z,R,X,......
    10.equal area criteria,point by point method....so on
    11.http://www.scribd.com/doc/6824941/power-system-stability-lecture

    ReplyDelete
  6. lighting of trains http://d.indiarailinfo.com/faq/post/1376

    ReplyDelete