ISRO Scientist Electronics Sample Paper – Previous Year Paper

image thumb ISRO Scientist Electronics Sample Paper – Previous Year Paper A sample previous year paper from ISRO for Electronics  Engineers to Give you a feel of the actual Paper,

 

 

A digital-to-analog converter with a full-scale output voltage of 3.5 V has a resolution close to 14m V. Its bit size is
A) 4B) 8C) 16 D) 32
Answer : (B)
A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5 A without any ripple. The armature resistance is 2W. The converter is working from a 280 V, single phase ac source with a firing angle of 80°. Under this operating condition, the speed of the motor will be A) 339 rpm B) 359 rpm C) 366 rpm D) 386 rpm
Answer : (C)

3 In relation to the synchronous machines, which one of the following statements is false? A) In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance B) The damper bars help the synchronous motor self start
C) Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
D) The V-curve of a synchronous motor represents the variation in the armature current with field excitation, at a given output power
Answer : (C)
A parallel plate air-filled capacitor has plate area of l0-4 m2 and plate separation of 10-3 m. It is connected to a 0.5 V, 3.6 GHz source. The magnitude of the displacement current is (e0 = 1/36p x 10-9 F/m) A) 10 mAB) 100 mAC) 10 A D) 1.59 mA
Answer : (A)
The 8085 assembly language instruction that stores the content of H and L registers into the memory locations 2050H and 2051H, respectively, is
A) SPHL 2050H B) SPHL2051H C) SHLD 2050H D) STAX 2050H
Answer : (C)
If E is the electric field intensity, Ñ(Ñ x E ) is equal to A) E B) E C) null vector D) zeroAnswer : (D) 7 The insulation strength of an EHV transmission line is mainly governed by
A) load power factor B) switching over-voltages C) harmonics D) corona
Answer : (B)
The Q – meter works on the principle ofA) mutual inductanceB) self inductanceC) series resonance D) parallel resonance
Answer : (C)
A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of the line, its ideal power transfer capability in MW isA) 1204 MWB) 1504 MWC) 2085 MW D) 2606 MW
Answer : (C)
In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor A) 8/6B) 12C) 16D) 8
Answer : (C)
At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of serivce, the load power factor becomes A) 0.85 B) 1.00 C) 0.80 lag D) 0.90 lag Answer : (C)
The conduction loss versus device current characteristic of a power MOSFET is best approximated by A) a parabola B) a straight lineC) a rectangular hyperbolaD) an exponentially decaying function
Answer : (A)
High Voltage DC (HVDC) transmission is mainly used for A) bulk power transmission over very long distancesB) inter-connecting two systems with the same nominal frequencyC) eliminating reactive power requirement in the operationD) minimizing harmonics at the converter stations
Answer : (A)
For the equation,s3 – 4s2+ s + 6 = 0the number of roots in the left half of s-plane will beA) 0B) 1C) 2D) 3
Answer : (C)
For the function f(x) = x2 e-x, the maximum occurs when x is equal to A) 2 B) 1C) 0D) -1
Answer : (B)

17 Comments

  • July 6, 2009 - 3:41 am | Permalink

    Thanks for the information …

  • SIVAKUMAR
    August 24, 2009 - 11:45 pm | Permalink

    Respected sir,
    i am from village area.i belongs to electronics and communbication department.i am doing final year in cape institute of technology, tirunelveli ,tamil nadu. i am so much interest in communication systems subject. i would like to grow in this communication field.i want to do my project in embedded systems. further i want to do what ? give idea about how to prepare for government exams. please help me……

  • Vivek
    August 27, 2009 - 10:48 pm | Permalink

    Hi, Sivakumar just focus on what you are learning, govt. jobs generally require you to be very good at technical + aptitude + reasoning .
    For technical , read your own course books thoroughly and for Apti+reasoning you can use R.S Agrawal books

  • Dileep kumar
    September 2, 2009 - 1:27 am | Permalink

    Hello sir,this is dileep from kavali(Nellore dst)studying Electronics and communication engineering in “Visvodaya institute of technology and scienc”,kavali.Sir, I am very much intrested to join in ISRO as a scientist but,I don’t have any guidence about this .So kindly give me reply about my qualifications required for this and also about entrance exams.
    Thank you sir.

  • Abdul Azeem
    December 19, 2009 - 12:53 pm | Permalink

    i did not get result of question paper of B.com computer second year

  • sagnik datta
    February 19, 2010 - 12:40 pm | Permalink

    sir i am doing my graduation from not so well renowned institute of india. i m doing my bachelor in electronics engineering. i want to build my career in the field of applied electronics aswell as communication .i want to join isro .i need help sir.pls suggest me a proper reason with soime of the papers of electronics.

  • sushobhan
    April 1, 2010 - 1:07 am | Permalink

    sir pls hyelp me.. how can i prepare 4 isro x am?

  • srz
    April 1, 2010 - 3:17 pm | Permalink

    dekho beta,isro me mainly analog commn,digital commn,power electronics,circuit theory ka que. electronics waalo ke liye aata hai………by the way u have not mentioned your dept…

  • SNEHIL BELEKAR
    April 2, 2010 - 11:42 am | Permalink

    DEAR FRIENDS
    I WANT TO APPEAR IN ISRO ELECTRINICS SCIENTIST POST I NEED FUTHER GUIDANCE TO PREPARE FOR THESE EXAM PLZ GIVE ME SOME VALUABLE INFORMATION SO THAT I CAN GET GOOD SCORE

  • vivekram
    April 6, 2010 - 1:50 pm | Permalink

    Hello sir, this is vivek doing enginering in Electronics and Instrumentation .. Can u give guidance for to wat to prepare… I have found only paprs regarding communication.. please guide me.

  • vivekram
    April 6, 2010 - 1:50 pm | Permalink

    Hello sir, this is vivek doing enginering in Electronics and Instrumentation .. Can u give guidance for to wat to prepare… I have found only papers regarding communication.. please guide me in what fields to prepare..

  • Babu
    April 6, 2010 - 8:24 pm | Permalink

    Sir i go wit SNEHIL BELEKAR , DEAR FRIENDS
    I WANT TO APPEAR IN ISRO ELECTRINICS SCIENTIST POST I NEED FUTHER GUIDANCE TO PREPARE FOR THESE EXAM PLZ GIVE ME SOME VALUABLE INFORMATION SO THAT I CAN GET GOOD SCORE

  • Rahul Mewada
    May 11, 2010 - 3:29 pm | Permalink

    sir , how can i get job in isro. i am a software engineer.and for entrance how can i prepair

  • Pankaj Vishwakarma
    July 18, 2010 - 6:49 pm | Permalink

    Dear Sir,
    I have three year diploma in electronics and Now apply for the post of scintific assistant in ISRO and need your guidance regarding its syllabus. Pls send to me on my personal mail. thank you..

  • pandurangan
    September 12, 2010 - 12:08 pm | Permalink

    sir,i am studing BE EEE ,i want to write an isro exam i did not know how to prepare for this exam so please give some tips

  • Anuradha
    February 13, 2012 - 2:37 pm | Permalink

    Sir, i completed my btech in electronics and communication engineering ,can u give the suggestions regarding the preparation of ISRO .thank you

  • srilatha
    July 19, 2013 - 11:51 am | Permalink

    sir i m frm elecrical branch…could u pls send me previous years paper nd books to refer for preparation fr management trainee 2010………my email id

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