ECIL Papers IT

Sir, I am preparing for the Electronics Corporation of India Limited (ECIL) Exam. So please provide me the Placement paper of the Electronics Corporation of India Limited (ECIL).

[Saksham]

Here I am providing the Electronics Corporation of India Limited (ECIL) Placement paper.

1. The 1.55 mm windows is not yet in use with fiber optic systems because –

a.) The attenuation is higher than at 0.85 mm
b) The attenuation is higher than at 1.3mm
c.) Suitable laser devices have not yet been developed
d.) It does not lend itself to wavelength multiplexing

2. Pre-emphasis in FM systems involves-

a.) Compression of the modulating signal
b.) Expansion of the modulating signal( placementpapers.fresherjobs4u.com)
c.) Amplification of lower frequency components of the modulating signal.
d.) Amplification of higher frequency components of the modulating signal.

3. In a terrestrial microwave system transmission of signals is achieved through-

a.) reflection from the ionosphere
b.) line of sight mode
c) reflection from the ground
d.) diffraction from the stratosphere.

4. Case grain feed is used with a parabolic reflector to

a.) increase the gain of the system
b). increase the bandwidth of the system
c.) reduce the size of the main reflector
d.) allow the feed to be placed at a convenient point.

5. In most microwave communication link rain drop attenuation is caused due to-

a.) scattering of microwaves by water drops of specific size.
b) scattering of microwaves by a collection of droplets acing as a single body.
c.) absorption of microwaves by water and consequent heating of the liquid
d.) absorption of the microwaves by water vapor in the atmosphere.

6. For the series RLC circuit in given figure, if w=1000 rad/sec, then the current I (in Amperes) is

a) 2 ?-15 b) 2 ?15 c) √2?-15 d) √2?15

7. The Y-parameter matrix (mA/V) of the two-port given network is

a) [2 -1 -1 2] b) [2 1 -1 2] c) [1 -2 -1 2] d) [2 1 1 2]

8.The maximum number of trees of the given graph is

a) 16 b) 25 c) 100 d) 125

9.Given figure shows a graph and one of its trees. Corresponding to the tree, the group of branches that CAN NOT constitute a fundamental cut set is

a) 1,2,3 b) 1,4,6,8,3 c) 5,6,8,3 d) 4,6,7,3

10. The Y-parameter matrix of a network is given by Y=[1 1 -1 1] A/V. The Z11 parameter of the same network is

a) ½ ohms b) 1/√2 ohms c) 1 ohms d) 2 ohms

11.For the given circuit, the switch was kept closed for a long time before opening it at t=0. The voltage v(0+) is

a) -10 V b) -1 V c) 0V d) 10 V

12. Let En and Ep, respectively, represent the effective Fermi levels for electrons and holes during current conduction in a semiconductor. For lasing to occur in a P-N junction of band-gap energy 1.2 eV, (En - Ep) should be

a) greater than 1.2eV b) less than 1.2eV c) equal to 1.1eV d) equal to 0.7eV

13. In a P-well fabrication process, the substrate is

a) N-type semiconductor and is used to build P-channel MOSFET
b) P-type semiconductor and is used to build P-channel MOSFET
c) N-type semiconductor and is used to build N-channel MOSFET
d) P-type semiconductor and is used to build N-channel MOSFET

14. In a MOS capacitor with n-type silicon substrate, the Fermi potential ¢ = -0.41 V and the flat-band voltage Vfb = 0V. The value of the threshold voltage Vt is

a) -0.82 V b) -0.41 V c) 0.41 V d) 0.82

Refer given figure for question 26 and 27. Assume D1 and D2 to be ideal diodes.

15. Which one of the following statements is true?

a) Both D1 and D2 are ON.
b) Both D1 and D2 are OFF.
c) D1 is ON and D2 is OFF.
d) D2 is ON and D1 is OFF.

16. Values of Vo and I, respectively, are

a) 2V and 1.1 mA b) 0V and 0 mA c) -2V and 0.7 mA d) 4V and 1.3 mA

17. In a BJT CASCODE pair, a

a) common emitter follows a common base
b) common base follows a common collector
c) common collector follows a common base
d) common base follows a common emitter

18. The multiple access communication scheme in which each user is allocated the full available channel spectrum for a specified duration of time is known as

a) CDMA b) FDMA c) TDMA d) MC-CDMA

19. GSM system uses TDMA with

a) 32 users per channel b) 16 users per channel c) 8 users per channel d) 4 users per channel

20. If Rx(τ) is the auto-correlation function of a zero-mean wide-sense stationary random process X, then which one of the following is NOT true?

a) Rx(τ) = Rx(-τ) b) Rx(τ) = -Rx(-τ) c) σx^2 = Rx(0) d) |Rx(τ)| <=Rx(0)

1. Critical load acting axially on a long column
Ans: (pi)2*E*I/L2

2. Relation between moment of area and radius of gyration
Ans: I=AK2

3. Cup shaped components are produced using which operation
Ans: drawing

4. A sheet of Al alloy having 2mm thickness is welded using which process
Ans: TIG

5. Two gears having teeth 18 and 40 and center distance 56…what is the module?

6. In thick cylinders, which of the following is true[*S stands for sigma*] (a) St>Sr (b) St=Sr ©St

7. In a plane stress condition, if the centre of Mohr’s circle coincides with the origin then which is true… ….the relation between Sx and Sy is asked

8. Lame’s theorem….F1/sinA=F2/sinB=F3/sinC

9. Young’s modulus value for steel=200Gpa

10. Thermal conductivity of silver=400w/m0K

11. Fouling factor formula……F.F =1/Udirty-1/Uclean

12. Relation between notch sensitivity factor and theoretical stress concentration factor

13. Effectiveness of heat exchanger definition

14. Reynolds’s number formula

15. Clinical thermometer is which order system ….0,1,2, or 3

16. Piezometric transducer is used to find which signals—static or…. dynamic

17. Peclet number formula=Re*Pr

18. Radiation energy emitted, Eemitted=S*A*T4

19. Which of the following is not related to CI engine
(a) Fuel pump (b) carburetor ©.. (d) none

20. Two connected in series having stiffness’s K1, K2
Kequivalent=K1*K2/K1+ K2