Strategy to Crack ISRO Scientist/Engineer 'SC' Exam

 Strategy to Crack ISRO Scientist/Engineer 'SC' Exam

How to prepare for ISRO Exam

Hello everyone, 
In this post, we are sharing strategy to crack ISRO SCIENTIST/ENGINEER 'SC' Exam. This strategy is derived by Er. Arpit Pandey (Scientist at ISRO). Read this complete post for both Written & Interview strategy. However, this post is written for Electronics aspirant but it is also useful for other streams. So, Let's start...


Author Profile: 
Er. Arpit Pandey, Currently working in VSSC, ISRO KERALA
ISRO 2016: Cleared both written and Interview round
ISRO 2017: Cleared written (51st rank) but not attended Interview.

Exam Pattern:

This test consists of two round- 
1.Written Test 
2. Interview Test

Written round:
Guys don’t need any serious concern if you guys prepared well for GATE or ESE, this round will be a cake walk for you. Ok now come to the main point….
First, do all the previous year’s paper of GATE ESE and ISRO, I bet you will get 10-15 same data question even without a change of any language so this way you can increase your number of attempts. Total duration for exam is 90min and you have to attempt 80 questions so if 15 questions come from previous years and you practiced well then you will get the lead of 15 questions in few minutes because for short duration exams number of attempts are more crucial (Don’t care about negative marking if you are half sure in any question).
Subjects which are very important:
Network(more weightage)(transients analysis, Transmission parameters, Current and voltage calculation using mess/nodal/thevenins etc),
Communication system(more weightage)(Avoid analog communication you can expect 1-2 question only, do the digital communication very well they ask Noise calculation, Constellation of different schemes(direct diagram), Bit Error Calculation, eye diagram only, Information theory),
Analog circuits(opamp most important, Multivibrator, Direct theory question on BJT/FET, question on current calculation for BJT/FET, clipper/clamper waveform diagram, Filter L,LC important), EDC(Only theory question and do not try to attempt numerical part because you may gonna lose more minutes and may lose the glimpse of other easy questions),
control system(ISRO 2017 they have given more weightage),
EMT(more weightage)(Maxwell equations, transmission line(here you may gonna lose precious time because of wrong question selection), waveguide(TE,TM,TEM defnition), calculation of characteristic impedance),
sometimes they ask mathematics question(differential equation, complex number, Integration, Numerical method), Microwave(can neglect)
In ISRO 2017 they first time asked Signal and System

NOTE: Topics whose questions try to avoid because of that you may lose easy questions (time management is important):- EDC(where logarithmic comes), EMT(waveguide freq calc part, charac impedance when complex input is given), Network(If too many parameter are present and circuit is long)
1. Try to attempt 50+ question , just concentrate on GATE syllabus only i.e. more than enough to score more than 120 marks
2. Somehow manage to score more than 120
3. Written score is not added in final result so don’t panic if you scored low

 Interview Strategy:

1. Interview slot date doesn’t decide the selection rate so don’t panic just prepare well and go for it.
2. And most asked question by the aspirants can we use HINDI: See most of the panel members are from South Indian so you can’t only use HINDI, you can mix hindi and English, they are going to see your talent not your language expertise (English lena hota to MBA min qualification rakh lete).
3. If you able to answer around 80% of their questions….Congratulation buddy!!! You will be the part of ISRO from that date
4. If you are working anywhere then NOC is must and if your company is not providing any such letter then you just mail the intimation letter to your boss and take the copy of that letter in the interview(Without NOC they won’t allow you)

Interview Experience and Guidance:

My interview was on 3rd January, 2017 in Delhi(Last slot), 10-11 panel members were seated around the U-Table and in front of them there was a white board where you need to explain all the answers with full of confidence. My interview duration was around 25-30 min (Generally they take 30-40 min) and I answered around 85-90% of their questions (don’t panic 70-80% is more than enough). MY luck supported me a lot and I got selected…yipeee!!!!
So tips for you guys:
1. Prepare your final year project very well and you need to explain all of your project within 2-3 min so I will suggest design a block diagram of your project and explain them one by one(we engineers are good to explain the different blocks of a diagram). Your project presentation will give them the IDEA of your selection and also they decide the department for which you will be suitable through your project. Project will play the crucial role.
2. They won’t allow thinking much so interview round will be like Quick Firing round…phataphat answer dena hoga nahi to they will skip to other question
3. And most important thing answer dete time wahi keywords use karna jisko explain kar sako i.e. they ask explain how can we design a single frequency sine wave? People start with Hartley oscillator and after that vo Hartley ko wahi design karwane lagenge aur phasa phasa ke bahar phek denge…most easy way is just told them we can use 3 RC circuits like we done in CRO, ab RC circuit me low pass, high pass bolenge to answer bhi dene me easy hoga. So prepare your answer like that.

Selection of subjects also plays major role….never select coomunication system as your favourite subject because communication systems covers digital+analog+wireless+satellite+many more.
When they ask tell me your favourite subjects, just tell them 3 major subject i.e. Analog(isko do ya na do vo puchenge hi isliye better isko daal do), Digital circuit(isme microprocessor puchenge), and control system only.
Aur phir bole koi aur subject then tell EMT/NETWORK/SIGNAL

Preparation Strategy:
Watch the NPTEL video for digital communication constellation diagram, is se related question pakka puchenge mostly QPSK/MSK/Offset QPSK etc
1. In analog circuits prepare multivibrator function and circuit diagram, OPAMP (Schmitt trigger bnane ko bol sakte ya phir other things like differential OPAMP etc.), BJT/FET function, H-parameter circuit, aur jitne bhi curves hai unka explanation i.e. V/I characteristic, Gain/BW curve etc.
2. Digital circuit: Logic family unka favourite hai(classification and difference between two families), Memory devices and classification, Counter, ADC/DAC, and mostly they ask from Microprocessor(Only the function of different instruction or they will ask some easy program)
3. Control: P,PI,PD, and most important PID. And controller/compensator, Nyquist/bode/Gain margin/Phase margin their significance
4. EMT: Waveguides equation i.e. cutoff freq, characteristic impedance of coaxial or anything else etc., Transmission line equations, Maxwell equations…here you can expect direct and quick questions only. Antenna me you just need to explain different antenna and their plots.

Sometimes they ask Satellite communication so learn: LEO, MEO, GEO, the effect of Raindrop, DUCT propagation, Frequency spectrum, In Optical fibre just read the modes of fibre, critical angle, acceptance angle etc…basic of all these things. The Question will be like you have to give the exact answer. They will not ask any round type question.

Cool Tips: Relax raho, haste raho (formal smile…jordaar siddhu style nahi), aur answer dete raho sochne ka time nahi milega iss liye dimaag ko fresh rakho….GUD LUCK GUYS/GALZ

Here Few of interview question(they asked during my interview):
1) draw sine wave to square wave and then convert that square wave again into sine
2) draw BPF and what happens if we will connect too many BPF and how do we calculate bandwidth
3) what is Q factor
4) sputtering
5) efficiency of solar cell
6) solar cell characteristics
7) annealing
8) what wire we use to connect dish antenna to TV and charac. Impedance of that wire
9) what is the use of cutoff freq in waveguide
10) which mode is present for open media
11) logic families and their type ..which one is faster...whose power dissipation is less
12) type of ADC and which one is faster
13) types of ROM and which ROM is used in Microcontroller and why do we call it PROM
14) difference between microcontroller and processor
15) type of RAM and which one is faster..draw circuit and what is refreshing and we use it and how do we store bits
16) if device is slow how do we manage processor
17) write Helmholtz equation( i wrote for 1-D they told me to write it for space)

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  1. Sir what will be answer of your second question? Regarding connection of many bandpass filters

    Will it be that the steepness of the curve will increase by adding many bandpass filters?