Goa Board Class 12 Question Paper June 2018 Applied and Consumer Electronics

*H605*
2018 VI 12 1430 Seat No. :

Time : 2 Hours APPLIED AND CONSUMER ELECTRONICS

Subject Code

V 3 3 3

Total No. of Questions : 5 (Printed Pages : 3) Maximum Marks : 50

INSTRUCTIONS : 1) Answer each question on a fresh page.
2) Write the number of the questions and sub-questions
clearly.
3) All questions are compulsory.
4) Figures to the right indicate full marks.
5) Draw neat labelled diagram wherever necessary.

1. A) Fill in the blanks : [2]
i) An op-amp is used as summing amplifier most commonly in the ________
mode.
ii) The full form of TFT used in LCD monitor is _______.
i) Briefly explain a “Zener diode”. Give an application of it.
ii) What is TDMA ? State two of its applications.
i) State the application of Audio amplifier and memory in a MP3 player.

2. A) Answer the following : [2]
i) Write the full form of SIM.
ii) Why are IC’s lighter in weight ?

V-333 -1- P.T.O.

i) Draw a neat block diagram to explain the principle of radio transmission
and reception. State the use of oscillator.
ii) Give three points of differentiation between monochrome and colour
television.

i) State the application of surround speakers and sub-woofer in a digital
home theatre system.

3. A) Fill in the blanks : [2]
i) The rotational system used in a CD player is ______
ii) The IF value of FM receiver is _______.
B) Answer the following : [3]
i) Draw a neat labelled diagram of a crystal microphone and explain its working
principle.

C) Answer any one of the following : [5]
i) With a neat circuit diagram explain the demodulation of AM waves. State
the function of a transmitting antenna.
ii) Explain with a neat block diagram FM superhetrodyne radio receiver.
State the main objective of pre-emphasis and de-emphasis in a FM system.

4. A) Answer the following : [2]
i) State two uses of a cell phone.
ii) Define “ Frequency modulation”.
B) Answer the following : [3]
i) What is a Composite video signal ? Draw its graphical representation. State
the standard output level of a composite video signal.

V-333 -2-

C) Answer any one of the following : [5]
i) a) Draw a neat labelled diagram to show the working of an op-amp as an
inverting amplifier.
b) Define closed loop gain for an op-amp.
c) State one disadvantage of IC over discrete components.
d) State one function of an IC package.
ii) a) Draw the block diagram of an op-amp.
b) Define open loop gain for an op-amp.
c) Name any two types of IC packages.
d) State the function of any one IC package.

5. Answer the following : [10]
i) Explain how signal processing takes place in a CD player.
ii) State any two factors that affect the loudness of sound.
iii) State two advantages of GPRS technology used in cell phones.
iv) Why is impedance matching of microphones and loudspeakers necessary ?
Name the moving coil loudspeaker used to reproduce high frequency sound.
v) State the function of LNB and Dish antenna in DTH transmission.
_______________

V-333 -3-