10 questions
1. a) What is the necessity of delay line canceller? Describe various types of delay lines using an MTI radar. [2x4=8]
b) What is blind speed? Calculate the minimum blind speed for a Radar, Which is operating at a frequency 20GHz and sends 1000 pulses per second. [8]
1. a) Explain the: i) Aircraft landing and ii) Aircraft tracking systems. [2x6=12]
b) Explain the working of different marker beacons used in radar navigational aids. [4]
2. a) Explain the working of CCD camera tubes and compare their performance with other camera tubes. [8]
b) Calculate the peak value of resultant signal when saturated yellow colour is added to the luminance Y signal. [4]
c) Determine the resultant peak signal when luminance signal is white and the resultant colour difference signals are added to it. [4]
2. a) What do you understand by interlaced scanning? Show that interlace scanning reduces the flicker. [8]
b) Sketch composite video signal waveform for atleast three successive line and indicate: i) Extreme white level ii) Blanking level iii) Pedestal height iv) Front porch and back porch. [8]
3. a) Explain the phenomenon of interleaving of colour signals. How does it help in ensuring compatibility? [8]
b) Write a note on weighting factors. Give the weighting factors for U and V. [8]
3. a) Justify the use of vestigial side band transmission for TV system. Draw the frequency band for channel III and IV in third band and show their respective sound carrier and colour sub carrier frequencies. [4+4=8]
b) Explain the compatibility issues related to colour and monochrome TV system. [8]
4. a) Explain the need of attenuating IF video signal within +/-0.75MHz of the video IF carrier. Draw the shape of the frequency response curve before detection and after detection. [8]
b) Explain the need and working of AFC circuits. [8]
4. a) Draw the circuit diagram for: i) Horizontal and vertical sync separator ii) RF tuner iii) EHT generator iv) AGC. [4x2=8]
b) Explain the use of: i) Delayed AGC ii) Simple diode detector iii) Pilot carrier scheme for colour sub carrier signals iv) Quadrature modulation in chrominance signal. [4x2=8]
5. Write the short notes on any Two: i) Modern TV receiver with LCD, LED and plasma displays ii) DISH TV iii) IPTV. [16]
5. a) Explain transmission and reception process of digital TV system. [8]
b) Write the name of common faults and their diagnosis in TV receiver. [8]