Hope you all have started the planning for the DRDO test

Hope you all have started the planning for the DRDO test. This is a golden opportunity to clearthe test. Why? You have all the resources and books in your hand. Any way many of you have askedhow to applyfor ISRO? Organizations like ISRO, VSSC etc dont conduct tests as DRDO do. They give ad in newspaper. They short list based on the percentage and call forinterview. Or they directly go to the premier institutes and recruit directly from there.I am giving a pattern ofquestionsasked for an ECE guy in ISRO-SACinterview. Once again I have to stress that ifurbasics are strong you will get thru theinterview. Now from very long time I am telling learnthe basics. What arethe basics?Here are examples:

1. In radar we may know how a CW radar works and what are itsapplications. Thats not enough! You should know why the CW can be used in thoseapplicationsand what types of radar can be used in thoseapplicationsother than CW radar.2. In digital we know how to reduce a Boolean expression using K-map. But do you know difference between looping 1s and 0s in K-map? Do you know there is a limitation in Kmap? Do you know any other method to reduce the expressions? Is there any limitation for that?3. In mechanical we have heard a lot about 100cc or 150 cc bikes. What actually cchere means? Is there any relationship with that with performance if so how and why?Is there any 100% efficient Carnot cycle? Why?4. In electrical we have heard a lot about transmission loss why it is caused? Can we preventit ?5. In Computer you know methods of sorting? Which is the most efficient and why?6. In Physics do you know what is the cause ofhall effect?Now have a first hand experience of an ISROinterview.

SAC (Ahmedabad) panel comprised of 6 members, very senior scientists. They asked about B.E project, subjectquestionswere picked up from the B.E project. Like if your project is on Commn, they askedquestionsfrom Commn.At NIT, Trichy ISRO dropped in for campus recruitment, panel members were from ISRO Trivandrum and ISRO Bangalore with some 20 years of experience in ISRO.

3 people on the whole were in the panel. 1 was an expert in microwaves another person in DSP, Digital Commn, VLSI, third person was chairman, I believe

They first made the usual formalities like doc verification and the usualquestionslike Did u appear for GATE? How did u come 2 NIT, Trichy for PG (GATE / NON GATE)?? What was your rank in theentrance testconducted by NITT to get in for PG?

Then they askedabtmy M.E project. Here at NITT, we have phase-1 project and phase-2 project at 3rd and 4th semester course.

Soitold that I am working with IP over WDM networks. They asked me from WDM technology, to compare microwave and fiber optics, guided and unguided commn differences? WDM components, about IPv6.

2nd member asked me from microwaves. Somequestionsraisedby him

-Eqvtcktof transmission line and explain all the primary andsecondaryconstants?

-lossesassociated with transmission line

-antenna gain, isotropic antenna?, antennaapplnsat different freq

-microwave sources - klystron, magnetron etc.

3rd member asked me from digital commn

- Sampling theorem, aliasing effects, digitalmodulation(compare BPSK and BFSK), what is FFSK?,line coding (compareManchesterand NRZ scheme), turbo codes??, trellis codedmodulation??, advantage of cyclic codes

somequestionsfrom spread spectrum also - like how anti jamming is achieved??

Altogether only basic fundas here also. Confidence is the key and it,s better to have a firm grasp on the subjects related to project.

Since the panel members were old people,questionsfrom microwaves, antennas,translines are sure to come forth.

In factquestionsfrom microwave engineering, antennas and transmission lines were asked for all people.

NOTE: thisrecruitmentdrive is alsorecruitingscientist for NTRO(National Technical Research Org, a newly started private R&D in same field). NTRO has requested ISRO to recruit some candidates for it. Toppers will be absorbed by ISRO and later students will be offered NTRO. before interview you will be asked about whether you want yourself to be considered for NTRO also or not.

1. There were 8 person in panel and only one panel was there. there was a long round table between candidate and interviewers so we have to explain everything on board.

2. They asked about GATEscore card,percentile, why did not went for M.Tech. If you are doing M.Tech. or Job they may askquestionsin your specialization

3. Tell about your project

4. Then somequestionsregarding project

5. Favourite subjects ( I said DSA, C and DBMS . I didn,t said OS because for OS they were asking w.r.t. Linux. In CN they may also ask general about Network Security ,firewall, encryption etc. CA include Digital, Microprocessor etc)

6. They are giving everybody a question from mathematics to solve on board, mostly to find the rank of matrix, solving linear equation (some tricky which can be answered without solving it properly) or probability.

7. They may give a K - Map to solve on board

8. In C(i told C as My favourite subject) they ask me about extern, static, linking, global variables, run time library , exit etc.

9. In DSA they ask me about ex-pression evaluation infix ,postfix, how ex-pression is evaluated etc

10. Solve the equation x+y=5 ; 4x+4y=12; x+2y+3Z=20 .Answer: nosolutionsince first two are contradicting so not possible

11. Some Other info about InterviewMostly interview is on basics not deep into subject

1.In CS at Ahmedabad On 12 Sept only one out of 37 was asked about the project but on 13 everybody was asked about project

2.They are asking some very basicquestionsfrom Digital like K-map solving , gates etc

3.Generally DBMS was not asked

ISRO SAMPLE TEST PAPER ON 15th JULY2006 AT DELHI

Hi to all,. If sampling frequency doubles thena) Quantization noise decreasesb) Quantization density decreasesc) Quantization noise increasesd) Quantization density increases2. Two signals of 2GHz and 4GHz are frequency modulated on same carrier 10 GHz. Find the ratio of frequency deviation if band widths of both are equal.a) 1:2 b)2:1 c) 1:1 d) 1:43. Graycode of111 is4. 3X512+7X64+5X8+3 then value in binary form contains _______numberof 1s.a) 7 b) 6 c) 9 d) none5. The 2s compliment of decimalnumber19 in 8-bit system isa) 111011016) The high gain codes area) Turbo codes b) BCH codes c) R-S codes7) BCH codes are of the type________a) Convolutional type b) c)8) Time constant of LC circuit isa) L/R b) L/R2 c) RL9) If R is doubled and C is halved then frequency of series RLC circuit is10) Thesolutionfor the equation (D2+4) y=sin2x is11) Laplace Tramsform of sin3x is12) The Z-transform for the series isX [n] = { 7; n= -1{5 n=0{ 1 n=1{0 else13) The magic Tee is aa) 4 port tee b) c)14) The register which holds the address of the next instruction isa) Program counter b) c)15) The antenna gain is given by...............?a16)Thesatelliteis in 630km orbit and transmitting at a frequency 5 MHz, when satellite is on your head the Doppler shift is--------a) b) c) 0 d)17) The impedance of a losslesstransmissionline isa) (L/C)18) A 50line with load impedance 100 the VSWR is19) In a waveguide measurement, the forward power is 10mW, thereversepower is 1mW then VSWR is _____________20) Transmitted power is 100W, gain of the transmitter antenna is 30 dB and the path loss is 50dBthen received power is21) When transmitted power is 100mW and the path loss 100 dBm then received power isa) -80 dBm22) When a emwaveis incident normally on a perfectconductorthena) Totally reflected b) partially reflectedc) Totally transmitted d) none.23) Zsc =100 Zoc =1 then Zo isa) 1 b) 10 c)___d)__24) When the operating wavelength of line is /4