Maharashtra State Board of Technical Education 2008 Diploma Electronics & Video Engineering Fundamentals of Communication - Question Paper

Sample ques. Paper – I
Course Name :- Electronics & Video Engineering
Course code :- EV
Semester :- Third
Subject :- Fundamentals of Communication
Duration :- three hours Marks: 80

Instructions :

1] All ques. are compulsory.
2] Figures to the right shows full marks.
3] Use of non-programmable calculator is permissible.

Q 1: Attempt any 8 of the following: [Marks: 16]

a) describe the term pitch.

b) List the factor affecting reverberation

c) State frequency range of woofer tweeter and squeakers.

d) List characteristics of Hi- Fi system.

e) State applications of P.A. system.

f) List features of magnetic recording.

g) State 4 advantages of compact disc.

h) describe modulation index in AM.

i) State advantages of S.S.B.transmission.

j) Write instantaneous formula of FM


Q two : Attempt any 2 of the subsequent : [Marks: 12]

a) With the help of neat sketch define the working of moving coil cone kind loudSpeaker.

b) describe the term Audibility range. discuss with the help of a neat sketch the frequency response of human ear to different frequencies.

c) define working principle of condenser microphone. discuss with the help of a neat sketch its construction.


Q three : Attempt any 3 of the subsequent : [Marks: 12]

a) Differentiate ranging from voltage amplifier and power amplifier.

b) Draw a neat circuit diagram and discuss working of class AB amplifier

c) describe tone control, why and where are they used?

d) discuss 4 basic requirements of PA system.


Q four : Attempt any 2 of the following: [Marks: 16]

a) Draw neat sketch and discuss how PA system can be configured for a public Meeting.

b) What will happen if i) Tape recorder head becomes rusty. ii) Tape driving belt is broken.

c) In an FM system, when the audio frequency (AF) is 500 Hz and the AF voltage is 2.4V, the deviation is 4.8 KHz. If the AF voltage is now increased to 7.2 V, what is the new deviation? If the AF voltage is raised to 10 V, while AF is dropped to 200 Hz, what is the deviation? obtain modulation index in every case.


Q five : Attempt any 3 of the subsequent : [Marks: 12]

a) discuss basic principle of Dolby system.

b) Draw a neat diagram of optical pickup unit used in CD player and tag its parts.

c) List various controls available on front panel of CD player. State function of every.

d) Compare optical recording with magnetic recording with respect to its working principles.


Q six : Attempt any 3 of the subsequent : [Marks: 12]

a) discuss the concept of SSB and DSB.

b) define frequency spectrum of AM with a neat sketch.

c) Draw block diagram of AM transmitter and tag its blocks.

d) discuss the concept of pre emphasis and De-emphasis.

Earning:   Approval pending.