ISRO Placement Paper : ISRO Scientist/Engineer Recruitment Exam Placement Paper 2009
ISRO Placement Paper : Isro Placement Papers - 2008
ISRO Placement Paper : General - Interview ISRO Guest house, Chennai - 7
ISRO INTERVIEW PATTERN ON 7th JUNE AT CHENNAI
Hello Friends, I have been called for interview in Chennai after shortlisted in written exam .My branch is CSE.There were 8-9 members in the interview pannel.
After verification of the original certificates the TA will be given to each candidate. My turn was 9th as they were calling according to their rank in written exam.
I entered into the room when my turned, they politely told me to have seat. The chief of member asked me whats your favorite subjects.I told networking,Operating system and software engineering.While i told C they told its not a subject its a language.
One of the member started to ask question from Software Engineering. Questions were like this.......
1. Tell me any one of the life cycle model
2.Give details of the phases in the life cycle model
3.What is cost estimation,Tell me any one. I discussed about COCOMO model while he asked about this model
They asked the formula which is related to the cost estimation.
4.What is verification and validation etc..
And Many more questions they asked.........................
Final question was what is fibonacci series and its application write on the white board.
They didn,t ask any question from project however from other students they have asked question from project..
ISRO Placement Paper : Technical - Electronics Tamil Sr. Sec. School,Delhi -
ISRO PAPER ON 22nd APRIL AT DELHI
helo friends, i appeared for ISRO written examinatiom on 22april,2007 for the post of Scientist Engineer.
paper was totally technical.Questions which i remembered are as follows:-
1) output resistance of ideal OP AMP is:-
a) 0 b) 1 c) infinite d) very high ANS: a) 0
2) waveguide acts as:-
a) LPF b) HPF c) BPF d) BRF ANS: b) HPF
3) quality factor of series RLC ckt. increases with:-
a) increase in R b) decrease in R c) doesn,t depends on R d) none of these ANS: b) decrease in R.
4) energy stored in capacitor is given by:
a) CV b) 0.5CV c) CV2 d) 0.5CV2 ANS: d)
5) CMRR of an OP AMP is given as 80db and Ad is 20000.Value of Acm will be:-
a) 4 b) 8 c) 2 d) 1 ANS: c) 2
some basic questions were based upon digital electronics,ckt. analysis,antenna theory,zener doides.
ISRO Placement Paper : Technical - Electronics Delhi - 22 April 2007
ISRO PAPER PATTERN ON 22nd APRIL AT DELHI
hello friends, i have attended the isro(electronics) exam held on 22nd April 2007 at DELHI.
the pattern was:
(1)all questions were technical
(2)no GK question
80 questions in 90 mns.
The pattern of xam was so simple & scoring for those who have also prepared for GATE.
A max. number of questions were asked from Antenna,Microwave& EMFT,apart from this main concerns were Digital Electronics,fundamental question on Maths(integration & prob) were asked.
Basically all the questions were either based on formulas or simple logic.I have attempted approx. 60-65 questions,osme of them are as given below;
1-SNR is defined as: 4 options.
2-To calculate the number of RAMchips for a given one: 4 options
3-The correct value of COS(A) in terms of exponential: 4 options
4-A figure to represent which kind of Flipflop: 4 options
5-A prob. on adder with shift register to identified no. of clock used to show the output (ie1010) 4options
6-Three questions were asked on Zener Diode to evaluate variable resirance,min. passing current & variable supplied voltage. 4 options
7- A problem on line to which passes thru point (-1,2) and making equal intercepts on both axis: 4 options
8-Transformer core requried 4 options with high permiability & low hysteris losses etc. like difft. values
9-To evaluate the prob. to get either of 2 color balls in a bag containg 6 red & 8 black balls 4 options
10-A wire length 2m having restiance 5 ohms, what will be the resitance if its length bcome 2 fold: 4options
By,
Shobhit
ISRO Placement Paper : Technical - Other Sathyabama, Chennai - 22 April
ISRO PAPER ON 22nd APRIL AT CHENNAI
Time: 90 min
Branch: Mechanical Engineering
Total No of Questions: 80
For correct answer: 3 marks
Wrong answer: -1 marks.
I will give only the harder questions as many as i remember.... I think there is no point in listing the dummy problems
1) Vander wal,s equation (We have to pick up the right answer from four choices)
2)To a heat engine a constant heat is supplied at 300kJ at 290 C and heat is rejected at 8.5 C. What is the heat rejected?
Ans : 150kJ
3)What is shrinkage allowance?
The dimensional allowance which must be made in molds to compensate for shrinkage of the plastic compound on cooling
4)Where spining operation is done?
Lathe
5) What is the maximum height of a siphon?
6)Time bound varying material is called?
7)There are two bodies, one with high mass another with low mass. Both are having same kinetic energy. Their momentum will be?
a) Both the momumtum will be equal b) Body of large mass will have high momentum. c)b) Body of low mass will have high momentum d)It depends uopn the velocities
8)Ratio of kinetic energies of two bodies is 1 : 4, The what is the ratio of their momentum?
9)What is the notch angle of izod impact test?
10) For a given nozzle angle and number of rows in the turbine, what is the optimum blade speed ratio?
11) A question on manometer with diagram
12) Two reservoirs are connected by a pipe of diameter D. Due to the chemical deposition the diameter is reduced by 20%. Neglect the frictional losses. How will the discharge will vary?
13)Around 10 questions on very basics of Matrices, Eigen values, Laplace.
14)A question on the position of metacenter
15) Match the following on Reynolds, weber, prandtl no
16) Problem on bulk modulus
17)What is the total volume change in a cylinderical vessel if strain e1 acts along longitudinal and stain e2 acts along tangential direction?
18)A question on belt friction
19)A turbine of periperal velocity V is designed for 100m head. what will be the periperal velocity of a turbine if the head is 800m?
ISRO Placement Paper : General - other Sathyabhama, Chennai. - 22 April
ISRO PAPER ON 22nd APRIL AT CHENNAI
1.if diameter of antenna increase by 3,then gain of the antenna will be,
a.increase by 3
b.decrease by 3
c.no change in gain
2.more number of problem from zener diode...
3.vector sum from plus two book..
4.simple problem from parallel and series connection of resistor...
5.plus two matrix problem 1 a b+c
1 b a+c
1 c b+a
ans: zero
solve (D2+16)y=cos4x
ans:y= 4x+Bsin 4x+x/8 sin 4x
7.in half adder circuit... what are the gates used?
8.conversion problem fron digital systems octal to binary
66.3(octal) to binary
9.formula for cos ax=? in terms of expo
ans: iax -iax
(e + e )/2
10.what is the o/p of 4:1 MUX?
11.enegry stored in variable capacitor and constant voltage...
ans : 2
0.5CV
12.WHICH OF THE FOLLOWING OSILLATOR HAVE HIGH ACCURACY? refer all the osillator
13.they given a circuit,which convert binary to...?
a. BCD
b.excess 3
c.gray
d.none of these
14.output impedance of ideal op-amp is...? ans: zero.
15.which one of the following is correct formula? choice are simple formula like V=IR,F=eE, etc...)
16. three problems from RLC ckt
ISRO Placement Paper : Technical - Electronics Delhi - 15 July 2006
ISRO SAMPLE TEST PAPER ON 15th JULY2006 AT DELHI
Hi to all,
. If sampling frequency doubles then
a) Quantization noise decreases
b) Quantization density decreases
c) Quantization noise increases
d) Quantization density increases
2. 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) 1:4
3. Gray code of 111 is
4. 3X512+7X64+5X8+3 then value in binary form contains _______ number of 1’s.
a) 7 b) 6 c) 9 d) none
5. The 2’s compliment of decimal number 19 in 8-bit system is
a) 11101101
6) The high gain codes are
a) Turbo codes b) BCH codes c) R-S codes
7) BCH codes are of the type________
a) Convolutional type b) c)
8) Time constant of LC circuit is
a) L/R b) L/R2 c) RL
9) If R is doubled and C is halved then frequency of series RLC circuit is
10) The solution for the equation (D2+4) y=sin2x is
11) Laplace Tramsform of sin3x is
12) The Z-transform for the series is
X [n] = { 7; n= -1
{5 n=0
{ 1 n=1
{0 else
13) The magic Tee is a
a) 4 port tee b) c)
14) The register which holds the address of the next instruction is
a) Program counter b) c)
15) The antenna gain is given by...............?
a16) The satellite is 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 lossless transmission line is
a) √(L/C)
18) A 50Ώline with load impedance 100Ώ the VSWR is
19) In a waveguide measurement, the forward power is 10mW, the reverse power is 1mW then VSWR is _____________
20) Transmitted power is 100W, gain of the transmitter antenna is 30 dB and the path loss is 50 dB then received power is
21) When transmitted power is 100mW and the path loss 100 dBm then received power is
a) -80 dBm
22) When a em wave is incident normally on a perfect conductor then
a) Totally reflected b) partially reflected
c) Totally transmitted d) none.
23) Zsc =100Ώ Zoc =1Ώ then Zo is
a) 1Ώ b) 10Ώ c)___d)__
24) When the operating wavelength of line is λ/4<λ<λ/2, the impedance is
a) Capacitive b) inductive c) ____ D) none
25) The value of L if source is 50V AC of 10 KHz frequency and current is 7.96 A.
a) ____
26) The resonant frequency is 50MHz bandwidth 100 KHz then Q factor is
a) ______ b)_______ c)…..
27)The Q factor of a series RLC circuit is
a)……b)……
28) Q value of a parallel RLC circuit is ________
a)……b)….
29) If the lines x+y+3=0, x-2y+7=0, 2x+ky+5=0 are required to be concurrent then the value of k is___ a) ___ b)…..
30) The vectors i-2j+k, 2i+3j-k,R are the complete, then r is given by ______
31) If a satellite revolving with angular velocity w and the velocity is v then
Curl v is _______
a) w b) 2w c) w 2 d) …..
32) If each stage amplifier contains 10dB gain the figure of merit of 2-stages is
Given by ……
33) The maximum rate possible in kbps if F=15 and bandwidth is 4 KHz is…….
34) The maximum time allowed for each flip flop for a ripple counter of mod-1024 , if clock given to it is 1MHz is ……..
35) The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns.
a) 25 ns b) 50 ns c) 100 ns d) none
36) The high speed for CML gate is due to operating it in --------- region.
a) non saturation
37)In a micro processor the wait states are inserted to
a) make the processor to wait during DMA operation
b) make the processor to wait during an interrupt processing
c) make the processor wait during a power shutdown.
d) interface the slow peripherals to the processor.
38) In a digital voltmeter the ADC’s used are of type
1. successive 2.flash type 3. Dual slope
in ascending order of time is
39) The number of NAND gates are required to implement AӨB (XOR), assuming compliments
not available ………….
40) The resolution for a DAC is given by 0.4% then no. of bits of DAC is
a) 8- bits
41) The chip capacity is 256 bits, then the no.
of chips required to build 1024 B memory
Is……….
42) Which of the following are correct?
1. A flip-flop is used to store 1-bit of information
2. Race around condition occurs in JK flip flop when both the inputs are 1
3. Master slave flip flop is used to store 2 bits of information
4. A transparent latch consists of a D- flip flop
a) 1, 2,3 b) 1,3,4 (ANS) c)1,2,4 d) 2,3,4
43) The bit rate of a QPSK compared to BPSK is
a)half b) double c) same
44) There are 5 red balls and 5 black balls in a box. The probability to select 2 balls one after other without reputting is,
a) 2/9 b) 1/90 c) 11/90 d) none
45) The rms voltage is obtained by multiplying peak by a factor
a) 1/√2
46) H(s)=S/(S+a) is a transfer function of ______
a) LPF b) Notch c) BPF d) HPF
47) Resistance of a 2 parallel resistors is 12Ώ and the effective resistance when one resistor broke is 18Ώ then the value of resistance in another is_________
48)The output of a phase modulator when input applied is integrating signal is
a)FM b) AM c) PM d) none
49) For a transformer the losses which vary with load are
a) core losses b) copper losses c) Hysterises losses d) none.
50) The waves which cannot be transmitted in waveguide are
a) TE b) TEM c) TM d) none
51) Diplexer is a
a) circulator only b)only transmitter filter c) only receiver filter
d) both transmitter and receiver filter
52) δ(t) represents impulse then ∫( δ(t) cos 2t )dt with limits 0 to infinity is
a) 1, b) -1 c) infinity d ) 0
53) ∫1/(x√(x2-a2)) dx isA)cosec2x
ISRO Placement Paper : Technical - Other Hyderabad - 30 June 2005
Hi friends,
Written Test for Scientist / Engineer_SC : [ Mechanical Engineering ]
Date: 30-06-2005
Place: St. Anne¡¯s School, Hyderabad.
Question Pattern for Written Examination
¨ª 80 Questions
¨ª 2.00 hrs Duration
¨ª ¨ù Negative Marks
¨ª All are Objective & Multiple choice Questions.
1 The concept of ---------------------------------- derived from the ¡°ZEROTH LAW OF THERMODYNAMICS¡±.
TEMPERATURE
2 The concept of ------------------------------------- derived from the ¡°SECOND LAW OF THERMODYNAMICS¡±.
ENTROPY
3 The expression for isentropic index [¥ã] in terms of number of degrees of freedom
( n ) ------------------------
1+ [ 2 / n]
4 The critical Reynolds no upto which the viscous flow exists in pipe -------------------
2000
5 Two forces of equal magnitude P acts at right angles to each other and having same directions. Find out the expression for their resultant [R ]--------------------
[2]¨ö P
6 The angular frequency of handclock------------------
¥Ð/30 rad/s
7 The equation for free torsional vibration----------------------------
[1/2¥Ð] [q/I]¨ö
8 A thin cylinder is subjected to longitudinal stress ¥ò0 and internal pressure P , findout the maximum shearstress developed in it [ q max] ------------------------
0.5 ¥ò0
9 Rate of moment of momentum is equal to the -------------------------
Torque applied by the body
10 The expression for loss of energy [he ] due to sudden enlargement of the pipe--------
he =[v1-v2]©÷/2g
11 A spring of stiffness K is divided into ¡°n¡± number of springs. Each spring having stiffness ---------------------------
nK
12 The non-dimensional number corresponds to
[inertia force\compressibility force]¨ö------------------------------ Euler number
13 Equation for forced vortex flow-----------------------------
v/r = constant
14 The causes of cavitation
Metallic surfaces are damaged
Noise & vibrations
15 How to increase the thermal efficiency in Carnot cycle by-------------------------------
Decreasing low temperature
16 The slenderness ratio in columns can be obtained from the ---------------
Least radius of gyration
17 50:1 gear reduction ratio possible in-----------------
worm gear
18 Wire drawing property named as -------------------------
ductility
19 One man is standing in the elevator and the elevator is moving in the upward direction. What type of reading regarding the weight of man will we get from gauge---------------
The weight of man shown by the gauge will more the actual weight of the man.
20 LMTD for counterflow heat exchanger is compared to parallel to heat exchanger-----
More
21 The free damping equation 2y¨¬¨¬ + 3y¨¬ +8y =0. Calculate damping factor (D.F )--------
3/8
22 The discharges for the two parallel pipes of same lengths are Q1 & Q2 respectively and their diameters are 200 mm & 800 mm respectively. Calculate the ratio of discharge of smaller pipe to larger pipe.
1/32
23 A compressor is used to compress the air from 5 bar to 10 bar .Calculate its critical pressure [ P٭]----------------------
2.64 bar
24 Equivalent twisting moment------------------------------
Te = [T©÷ + M©÷]¨ö
25 The shear stress distribution in pipe flow -----------------------------
Centre is zero and linearly varying from the center to the wall
26 The irrational component in x-y is--------------
¥äv/¥äx = ¥äu/¥äy
27 The ratio kinetic viscosity/thermal diffusivity is -------------
Nusselt Number
28 The cylinder is subjected to insulations K & 2K at the outside surface to avoid heat transfer. In order to arrest heat transfer effectively , which insulation should be provided first at the outer surface?
2K & K respectively
29 The wall having conductivities
K1 K2
Findout the equivalent conductivity of the material--------------------?
29 The maximum amplitude in this vibration equation y = 6 sin¥øt --------
6
30 The thermal boundary layer in an ideal fluid flow is --------------
0
31 What does tend to stagnation point -----------------------
The velocity is 0 at the stagnation point due to the increase in pressure energy from the conversion of K.E into P.E.
32 Match the following:
i. subsonic nozzle : figure
ii. Supersonic nozzle : figure
iii. Subsonic diffuser : figure
iv. Centrifugal compressor : figure
33 The factor of safety subjected to number of cycles related to
Endurance limit
34 In composite beam , width is directly proportional to -----------------------------------
if the depth of the beam is kept constant.
¥á M
35 The heat transfer rate of hollow cylinder is inversly proportional to the following
--------------------------------- r2/r1
36 A material at 300¨¬C is immersed in water at 30¨¬C such that it will take 170 seconds to become 150¨¬C .
A same material at 300¨¬C is put in air at 30¨¬C but it will take 200 seconds to become 150¨¬C. What is the reason behind it ?
K of water is more compared to air
37 Radiation is ------------------------------------------ wave phenomenon
Electromagnetic without medium
38 The compression ratio[r] of petrol engine ranges from -------------------
6 to 10
39 ¡ò¥äQ/T =0 and ¥Äs=0 corresponds to ---- irreversible & adiabatic
40 Cold working of metal increases ----------------------
Tensile strength
41 The power absorbed in belt drive depends on-----------------------
Tension in tight side, Tension in slack side, coefficient of friction & Radius of pulley.
42 The temperature loss related -------------- hysteresis loss
43 The convergent pipe having entry and exit diameters are 100 and 50 mm respectively, find out their velocity ratio from entry to exit¡¦¡¦¡¦¡¦..
1/4
44 They had given one composite circular pipe having 4 varying cross sections . They are 2D, 1.5D, 4D & D respectively. The water is entering at velocity V at section 1 and leaving at section 4. Find out the pressure decreasing order¡¦¡¦¡¦¡¦¡¦
P4>P2>P1>P3
45 The bulb having weight 150N supported by two ropes and attached to the walls having angles 45¨¬ & 60¨¬. Findout the reaction forces in the ropes ?
This is related to Lamis theorem
46 A hollow sphere of radius r . A particle is moving with coefficient of friction 1/[3]¨ö inside the sphere from wall . which height will it become rest?
47 The disc is resting on the rough wall by a rope tied at the center . The rope makes angle with the wall around 30¨¬. The tension in the string is ----------than the weight of the disc. more
48 A railway wagon containing partially full of water. Which angle----------------
49 Findout the graph between discharge [Q] in the x-axis and head [H] in the y-axis----------
50 In welding pitch dimension is limited to----------------------
51 The composition of inconel alloy-------------------
52 There is a heat transfer between two walls having thickness and conductivities k1 & K2 respectively. The linear temperature profile of first wall is more steeper than the second wall . Findout the ratio K1/K2 ---------------------
a) >0 b) <0 c)=0 d) the given data is insufficient
53 The max shear stress developed in solid circular shaet is 100 MPa . Calculate the max normal stress developed in it? ??????
54 This question related to welding -------------
55 Bearing liner-------------------------
a) Babbit metal b) Gun metal
56 Electrical resistance material --------------Nichrome
57 This question related to radiation
58 A sun emits 1150K at 0.5¥ì. A furnace emits 300k from small door --------------
59 In the simple pendulum , the maximum amplitude depends on ------------------- increase in length
60 The fuel flow increases if-------------------------
a) exhaust valve burnt b) filter choke c) silencer choke
61 The jet propulsion depends on-------------
a) jet velocity b) weight ratio
62 What is the condition for perfect frame-------------------------------------
63 Depth of cut can be increased by-----------------------
64 The workpiece can be held in-----------------
65 This is related toNucleate boiling
66 What is the expression for Reynolds number in terms of diameter of the pipe¡¦¡¦¡¦¡¦..Re =¥ñVD/¥ì
67 Air conditioning means---------------
a) cooling & heating b)dehumidifying c) removing impurities from air d)all
68 Fibrous fracture occurs in ------------------------
a)brittle fracture b) ductile fracture c)shear fracture d)none
69 In laser beam machining , the workpiece should be--------------
a)absorbed by all the rays b) reflected by all the rays
70 Foam and coke are good insulators. Why?-----------------------
a)less density b)
71 Gold property------------------
a)good conductor b)good insulator
72 In lathe , the workpiece can be held in --------------------------------------
a) live center b)steady rest c)3-way chuck d)4-way chuck
INTERVIEW PATTERN
I. Project Explanation
II. Fluid Mechanics:
i. Define laminar flow & Turbulent flow
ii. What is the value of Reynolds no in pipe flow
iii. What is the significance of Reynolds no
iv. Head losses in pipe
v. Define boundary layer in pipe flow & thickness of boundary layer
vi. What is the variation of ¥ä in laminar & turbulent flow
III. Strength of materials
i. Draw the figure for spring damper system
ii. Differential equation for spring damper system
iii. Find out the deflection of spring damper system
iv. Define stiffness and unit of stiffness
IV. Material Science
i. Ferrous materials
ii. Non-ferrous materials
iii. Define fatigue
iv. Define fatigue resistance?
v. Curve for fatigue
vi. Fatigue limit
ISRO Placement Paper : Aptitude - General
ISRO Sample Question
b)unsymmetric models
c)none of the above
d) both
b) bytes
c)nibble
b) loop jamming
b)n/2...