II B.Tech II Semester Supplementary Examinations, Apr/May 2006 COMMUNICATION ENGINEERING (Bio-Medical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What are the applications of balanced modulator? Prove that the balanced modulator produces an output consisting of sidebands, with the carrier removed.
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(b) An AM broadcast station has a modulation index of 0.75 on the average. What would be its average power saving it if could go over to SSB-SC transmission while having to maintain the same signal strength in its reception area. [8+8] 2. (a) Draw the complete block diagram of the Armstrong frequency modulation system and explain the function of the mixer and multipliers. In what circumstances can we dispense with the mixer? (b) The equation of an angle-modulated voltage v(t) = 10 sin(108 t + 3 sin 104 t) what form of angle modulation is this? Calculate the carrier and modulating frequencies, the modulation index and deviation and power dissipated in a 100-ohm resistor. [8+8]
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3. (a) An AM transmitter of 1KW power is fully modulated. Calculate the power transmitted if it is transmitted as SSB. (b) Calculate the filter requirement to convert DSB signal to SSB signal, given that the two side bands are seperated by 200 HZ. The supressed carrier is 29 MHZ. (c) Give and explain three areas of application where standard FM transmission is needed? [4+6+6] 4. (a) Discuss in detail the various tracking techniques used for receivers.
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(b) A Superheterodyne receiver is to tune the range from 4-10 MHz, with an IF of 1.8 MHz. Calculate the range of oscillator frequencies, the range of image frequencies. (c) Write about image frequency.
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5. (a) Derive the expression for Noise Figure for an amplifier. (b) The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Ω input resistor, a 1600 Ω equivalent noise resistance and 27 K Ω output resistor. For the second stage these values are 25, 81 kΩ, 10kΩ and 1MΩ respectively. Calculate the equivalent input-noise resistance of this two-stage amplifier. [8+8]
6. (a) What is Pulse Modulation? Classify pulse modulation systems. (b) State and explain Sampling Theorem. 1 of 2
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Code No: NR221102
7. (a) What is companding? Why is it used? Why is it preferable to quantizing with tapered steps? Illustrate your answer with a sketch of typical companding curves. (b) What are the advantages and applications of Pulse-code Modulation? [8+8] 8. (a) Why FSK is not suitable for high speed modems. (b) Why are modems needed for telephone communications.
a(m,n) = a(m-1,a(m,n-1)) if m!=0,n!=0 · (b) Determine what does ... [8+8] · 4. If an array holding a queue is not considered circular, the general method suggests.
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b=4.318 cm is fed by a 4 GHz carrier from a coaxial cable. Determine if a · TE10 mode will be propagated. If so calculate the phase velocity and group · velocity.
(c) An amplifier with voltage gain of 60 decibels uses 0.05 of its output voltage in · negative feedback. Calculate the gain of the feedback amplifier. [6+6+4].
Determine the length of the wire needed if the diameter · of the wire is 0.25 mm. Assuming that the temperature coefficient of resis- · tance of the wire is constant, ...
(b) Draw the block schematic of 4x1 MUX and give its truth table. [6] · 6. (a) Design a full adder with minimum number of NAND gates. [8] · (b) Draw the logic ...
8. (a) Enumerate various mechanical and diffusion properties of cartilage with ex- · amples? [8] · (b) Write briefly about âlubricationâ of joints? [8] · *****. 1 of 1.
250 kN and a minimum value of 100 kN. The properties of the plate material are as follows: · Endurance limit stress = 225 MPa, and yield point stress = 300 MPa.
... Apr/May 2006. UNIX AND WINDOWS NT ... (b) Write about shell variables · [8+8] ... How the Windows NT operating system can partition the disk? How it can ...
A constant strain triangle in a state of plane stress is subjected to a uniform tem- · perature change of âT. Assuming that the coefficient of thermal expansion is α,.
(b) With the help of diagram, explain the (input/output sub system)IOSS oper- · ations for ... a. A police database the provides information on stolen automobiles.
(a) Explain the various capabilities and limitations of the robot languages. [7] · (b) Describe the following search techniques: · i. Depth-first search · ii. Breadth-first ...
8. (a) Describe the HyL process of sponge Iron production. [6] · (b) Explain the advantages and disadvantages of HyL process of sponge Iron pro- · duction.
(a) Explain the various capabilities and limitations of the robot languages. ... 3. What are the different tupes of electric drives used in the robots? Describe them.
distribution within the cylinder. θ denotes a coordinate in a cylindrical coordinate · system. [16] · 8. (a) Two concentric cylindrical metallic shells of radii a & b (i.e. ...
All Questions carry equal marks · ***** · 1. Explain the ultimate analysis of coal and its importance. [16] · 2. Discuss the importance of catalyst in shift conversion.
(b) Explain the basic principle of the instrument used for Condition monitoring · of any process. [8+8] · 2. (a) Compare and construct the functioning of rupture ...
(a) What is the difference between chipping and spalling? (b) Explain how tool life curves are established? (c) Discuss working principle of strain gauge ...
