ECIL-(Electronics Corporation of India limited) Papers(Original)This paper I have had attempted myself, so i am providing few of questions that i still remember.

                                                    ECIL GET EXAM -2011  About exam pattern :1)Paper consists of 50 questions2) Each question of 3 marks and -1 negative mark for each wrong answer.3) Only technical questions were asked ie ( No aptitude no GS no English was asked)4) All questions are objective type only 5) Paper is of two hours

Q1- formula of CMRR=?

Q2-Which of these type of transmission line is most suitable for "High frequency power applications" ?      (a) co-axial wire      (b) wave guide      (c) microstrip      (d) stripline

Q3-Radiowave transmission occurs in?     (a) Sky wave     (b) ground wave     (c) LOS     (d) space wave propagation

Q4- Wavelength(Lambda) and Diameter(D) were given.Find the beam width?

Q5- 1 Liter water is boiling in an isolated drum and another isolated drum containing 9 Liter water at 25 degree centigrade.If water from both drums are mixed in an another isolated drum then what will be the resulting temperature of the mixure ?

Q6-The size of SMPS varies as-       (a)  increases with increase in rated voltage       (b) decreases with increase in rated voltage       (c) depends upon supply frequency       (d) independent of supply frequency

Q7- A transmission line having charecterstic impedence Z= 50 ohms and length L=500 kms if the length is reduced to 50% then charecteristic impedence        Z will become ?

Q8- Find the laplace transform of  1/(s2 + a2  )

Q9- If the horizontal probe of CRO is  given a signal  Sin wt, and to vertical probe is given  Cos wt. Then the CRO will        display-       (a)Circle       (b) straight line       (c) Parabola       (d) sinusoidal

Q10- In a transmission line if Load impedence ZL and Zo  are given in the question then Find the reflection coefficient  T?

Q11 GSM mobile operate at a frequency range of-    (a)900 MHZ    (b) 100 KHZ    (c) 1200 MHZ    (d) 600 MHZ

Q12  A program was given

a=2;b=a/2;(a<b)?:a:bThen what will be its output?(a)1 (b)2 (c) 3 (d) 4

Q 13  L ,C   and Quality factor Q was given. Find the bandwidth?

Q 14 The black box is ? (b) EX-OR (c) NAND (d) NOR

 Q-15 The Duty cycle of a signal is 0.2 which has average power of 20 W. What will be its peak power ?  (a) 200  (b) 400 W  (c) 100 W  (d) 440 W

Q-16 The PRF of a waveform is given. Find the maximum unambiguous range ?

Q-17 A microprocessor interfaced with 8K memory has last address  2FFFH . Find the first address?

Q-18 0.0111 has decimal equivalent ?

Q-19 11101 corresponds to 1A current then 1111001 has value of current ?

Q-20 CE-configuration has    (a) BE-Forward biased   (b) BE-Reversed biased   (c) CE-Forward biased   (d) BE-Forward biased

Q-21 An Ammeter having 1mA current flowing through it has R=100 ohms. If it has to be converted into     Ammeter of 1A then the value of shunt resistance required will be ?

Q-22 Intermediate frequency =450 KHZ and  frequency of signal is given. Find the Image frequency ?

Q-23 The heaviest and slowest particle is ?      (a) Alpha particle      (b) Beta particle      (c) Gamma particle      (d) Pi-mason

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                                   ECIL Exam paper -2010 held on 2010 for ECE

Instructions

1) total 50 questions were asked

2)duration 3 hours

3)each question of 3 marks and negative marking of -1

1) Isotopes have ?

a) unequal protons  b) unequal electrons  c) equal electrons and unequal neutrons d) none

2) Which of the following have least ripple factor 'r'  ?

a) Half wave rectifier b) Fullwave rectifier c) Bridge rectifier d) Transformer tuned rectifier

3) Which of the following has non-linear output?

a) Differentiator b) Integrator c) mixer d) Class A amplifie

4) What is the gray code for 5 ?

5) Unambigious range when PRF=2KHZ is ?

6) Phase sensitive demodulators is used in instruments ?

a) To measure phase angle between two AC signals  b) AM demodulators  c) PM demodulators  d) None

7) In a transmission line maximum power is delivered to load when standing wave ratio is ?

a) 1:1 b) 2:1 c) 1:2 d) 1:sqrt (2)

8) To design a 16KB memory system using chips having 12 address lines and 4 data lines, the number of

such chips required

a) 1 b) 2 c) 3 d) .

9) A 1mw signal is attenuated at the rate of 5dB/1000ft. What is the power level into receiver that is 6000ft

from signal source  ?

a) -10dBm b) -20dBm c) -30dBm d) -6dB

10) Dominant form of distortion in simple Push-Pull Amplifier ?

11) When the transmissionline is lossless relation between R,L,G and C ?

12) v(t)=2sin(2000wt)+0.3cos(4000piet)+0.1 find sampling frequency ?

13) At what condition gain of feedback system =(1/Beta) ?

a) AB<<1 b) AB>>1 c) B>>1 d) A>>1

14) RAID configuration of disks are used to provide ?

15) To store a floating point number, in a computer system, having 16-bit mantissa and 8-bit exponent(each

       in 2's complement) what are the smallest and largest positive values which can be stored ?

16) Semaphores are used for ?

17) For a 13-bit DAC(0-10v) when a binary input increased by 1 output(V0) increases by  ?

18) For a coaxial cable Z0(charecteristic impedance)=75ohms, (load impedance)ZL=75ohms and connecte.

       source is 10V DC then V0(output) ?

19) Rise time =2*10^(-7) find bandwidth ?

20) Rise time for 1st order system when 1v input is 1second and for 2v input is  ?

21) X(t) is the input function and h(t) is the impuse response for the system, then output can be found

     using ?

22) (Z)^-1 represents?

23) A source 10Sqrt(2) sin(wt) having internal resistance 10+40i is connected with a load 10-40i, find the

      optimum power delivered to the load ?

24) Two voltages sources 0f 1.5v having internal resistances each 0.3ohm and 0.6ohm are connected is

      parallel. A 0.8ohm is connected accross the combination, find the heat generated ?

25) Four easy questions on OPAMP circuits----!(on schmitt trigger, Integrator )

26) Given UV light frequency and asked frequency ?

27) In a meadium having Er=2 and Ur=2(Relative permitivity and relative permiability) find the velocity of the

      wave ?

28) A question on Zenor diode (asked max and min load currents) ?

29) For parabolic antenna diameter and operating freq are given then find HPBW ?

30) A sample and hold ckt is given in enhancement mode of mosfet then find hold error ?

31) Find noise margin in terms of Voh(max,min) and V ih(max,min) ?

32)For a LTI system rise time is given at 1v then find it at 2v ?

33) For a LTI system rise time is given for unit impulse input then find corresponding 3db bandwidth ?

34) PC and SP contenting value given. then for a given subroutine what will be the value of SP ?

35) Simple Program me of C is given then find result ?

36 )Given 4096.6750 convert it into binary ?

37) In CRO vertical plate getting ac signal i/p where horizontal remains idle, what will display on screen ?

38)Four T.F is given then check for critically damped ?

39) Signal attenuation rate is given 5db/1000ft then find attenuation after 5000ft distance ?

40)Question given on De morgons law ?

41) In a zener diode knee current and two parameter voltage given then find Max and Min curreni

decicipation ?

42) For a ckt having two cell given its internal resistance and an i/p voltage is given then find power

dicipation across the ckt ?

43) RS485 is which type of connector ?

a) Single end, multipoint b) Diffrential, multipoint c) Multipoint, diffrentiat

44) What is main advantage of I/omapped over memory mapped ?

45)In 8086 for wait state which command is used ?

a) ready b) hold c) intr d) none

46) If a lissajous pattern is observed in a circle and one waveform is horizontal 20 sin 100t and vertical one is

20 sin(100t+q) than what is value of angle ?

a) 90 b) 60 c)

47) Which gate is used for parity generation and checking ?

a) EXOR b) NOR c) NANY