Maharashtra State Board of Technical Education 2008 Diploma Electronics and Communication Audio Video Engineering - Question Paper

Subject: Audio Video Engineering
Third Year: Semester 5
3 Hours / 80 Marks
November 2008



Instructions:
1) All ques. are compulsory
2) Answer every next main ques. on a new page
3) Illustrate your answers with neat sketches wherever necessary
4) Figures to the right shows full marks
5) Assume suitable data, if needed
6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in exam Hall.


1. Attempt any 4 of the following: [Marks: 16]

a) List important characteristics of Hi-Fi amplifier. Draw its block diagram.
b) State advantages of CD
c) Define the terms:
i) Brightness
ii) Contrast
d) State merits and demerits of negative modulation
e) State the working principle and specification of LNBC
f) Draw meat diagram showing structure of yagi-uda antenna

2. Attempt any 3 of the following: [Marks: 12]

a) Explain function of trunk amplifier and bridging amplifier in cable TV system.
b) Compare NTSC, PAL and SECAM system
c) Explain why AM is preferred for picture signal transmission. describe positive modulation.
d) Explain additive colour mixing. State Grassman’s legal regulations.

3. Attempt any 3 of the following: [Marks: 12]

a) Draw typical signal distribution plan of cable TV system.
b) Explain the separation of u and v signals with the help of neat circuit diagram.
c) State and discuss necessity of cross-over network in Hi-Fi amplifier.
d) What is frequency interleaving? Why it is used in CD player?

4. Attempt any 2 of the following: [Marks: 16]
a) With neat circuit diagram discuss working of ACC amplifier.
b) Draw block diagram of PAL-D decoder and discuss the identical.
c) Draw neat circuit diagram showing constructional details of PIL picture tube. discuss its operation.

5. Attempt any 3 of the following: [Marks: 12]

a) Draw block diagram of monochrome T V transmitter.
b) Define subsequent terms in composite video signal:
i) Pedestal height
ii) H-sync pulse
c) State and discuss CCIR-B standards for colour TV transmitter and receiver.
d) What is colour burst signal? Why and where is it added?

6. Attempt any 3 of the following: [Marks: 12]

a) What is VSB transmission? define its necessity.
b) Define the term persistence of vision. How it helps in image continuity.
c) Draw neat sketch showing constructional details of vidicon picture tube.
d) With neat circuit diagram, discuss operation of graphic equiliser.

Earning:   Approval pending.