NOTE: There are 9 Questions in all.
· Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
· Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.
· Any required data not explicitly given, may be suitably assumed and stated.
Q.1 Choose the correct or best alternative in the following: (2x10)
a. This circuit in a TV receiver is mainly controlled by sync pulses
(A) video amplifier. (B) if amplifier.
(C) sync separator. (D) mixer.
b. In scanning sequences, the number of lines lost during vertical retrace are
(A) 20 lines. (B) 40 lines.
(C) zero lines. (D) 10 lines.
c. For TV broadcast the transmission used is
(A) SSB transmission. (B) DSBFC transmission.
(C) VSB transmission. (D) DSB transmission.
d. The kell factor varies in the range
(A) 0.2 to 0.4. (B) 0.5 to 0.6.
(C) 0.65 to 0.75. (D) 1 to 2.
e. The cable used to connect Yagi antenna to TV receiver
(A) flat cable. (B) coaxial cable.
(C) fiber optic cable. (D) shielded cable.
f. India uses the system of colour TV
(A) NTSC. (B) German PAL.
(C) French SECAM. (D) American system.
g. Antenna used for TV transmission
(A) Turstile Antennas (B) Yagi –uda antenna
(C) Parabolic reflector (D) Dish Antenna
h. Colour burst is transmitted with the slot on
(A) vertical sync pulses (B) horizontal sync pulses
(C) picture signal (D) back perch of horizontal sync pulses
i. Video signal bandwidth in TV
(A) 20 Hz to 20 KHz. (B) 7 MHz.
(C) 5 MHz (D) None of the above.
j. Colour subcarrier frequency in PAL is
(A) 5 Hz (B) 7 MHz
(C) 1.25 MHz (D) 4.43 MHz
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. List CCIR-B standards for colour TV signal transmission. (8)
b. Draw the block diagram of monochrome TV transmitter. (8)
Q.3 a. Draw composite video signal & label it. State the function of different pulses in it. (6)
b. Draw the block diagram of monochrome TV receiver with appropriate waveforms. (10)
Q.4 a. Draw & explain Delta gun picture tube. (10)
b. Write the function of following parts / controls in TV picture tube
(i) Deflection Yoke (ii) Aquadage Conductive coating. (6)
Q.5 a. Explain the principle of colour TV transmission & reception. (4)
b. State the function of
(i) Booster (ii) Diplexer
(iii) Balun transformer (iv) Dipole antenna (12)
Q.6 a. Draw and explain Yagi Uda Antenna. (6)
b. Explain the working of PAL encoder with suitable block diagram. (10)
Q.7 a. Draw and explain block diagram of PAL-D colour TV receiver. (12)
b. Compare Parabolic Antenna & Folded Dipole Antenna. (4)
Q.8 a. Explain in brief the principle of colour TV camera. Explain how Luminance & Chrominance signals are derived. (11)
b. Define and explain following terms w.r.t. TV
(i) Hue.
(ii) Saturation.
(iii) Luminance signal.
(iv) Chrominance signal.
(v) Colour burst signal. (5)
Q.9 a. Mention 3 different TV systems used in the world and compare & contrast the TV systems. (12)
b. Compare Yagi antenna & folded dipole antenna. (4)