Goa Board Class 12 Question Paper Mar 2018 Applied And Consumer Electronics _New Pattern_

2018 III 15 1000 Seat No. :

Time : 2 Hours APPLIED AND CONSUMER ELECTRONICS (New Pattern)

Subject Code

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8

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

INSTRUCTIONS : i) Answer each question on a fresh page.
ii) Write the number of each question and sub-question clearly.
iii) All questions are compulsory.
iv) Figures to the right indicate full marks.
v) Draw neat labelled diagrams wherever necessary.

1. A) Fill in the blanks : [2]
1) The type of IC which is used to perform linear operation on signals is
_________.
2) Tiny pellet of aluminium is melted upon the surface of an n-type crystal in
_________ fabrication technique.

B) Answer the following : [6]
1) With the help of a block diagram explain Op-amp as a multi-stage amplifier.
2) Explain diffusion method for diode fabrication. State one advantage of this
method over Alloy method.

C) Answer the following : [2]
Give one point of difference between Analogue IC and Digital IC. Give one
example of each.

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2. A) Answer the following : [2]
1) Give one advantage of storing information on a CD.
2) Name a device of a CD player that reads or writes informations on a CD.

B) Answer the following : [6]
1) How is signal processing done in a CD player ?
2) With the help of a neat labelled diagram explain the working of a dynamic
microphone.

C) Answer the following : [2]
Two speakers of 8 Ohms are to be connected to a 100 watt amplifier with 4
Ohm output terminals. Draw the wiring diagram to connect these speakers to
the amplifier. Why impedance matching necessary in PA system ?

3. A) Fill in the blanks : [2]
1) The sky waves in radio communication are reflected in the sky by ________.
2) The ability of the radio receiver to receive the weak signals is called
________.

B) Answer the following : [3]
State one function of a tone control circuit in radio receiver. Define AGC and
AVC with respect to radio receivers.

C) Answer any one of the following : [5]
1) Draw the block diagram of AM superheterodyne radio receiver. What are
the properties of radio wave ? Why is a ground wave a weak wave ?
2) Draw the block diagram of a FM superheterodyne radio receiver. Explain
how Limiter on FM receiver eliminates noise in FM reception. State IF
value of FM and AM receiver.

4. A) Answer the following : [2]
1) Name the primary colours of a coloured television.
2) State the scanning sequence of lines and frames in television
communication system.

B) Answer the following : [3]
State any two advantages of a DTH system. Name any two types of TFT
technologies.
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C) Answer any one of the following : [5]
1) Name any two types of camera tubes and state their working principle.
Draw a neat block diagram of the video section of a B/W TV. State two
stages of a TV tuner.
2) What is a composite video signal ? Draw waveform to identify the three
components of composite video signal. State field frequency and picture
frequency in international standard recommendations.

5. Answer the following : [10]
1) State the function of a SIM used in Cell phone. What are the advantages of
Bluetooth Technology ?
2) State two limitations of Cordless Telephone over a mobile phone.
3) Name different speakers used in a 5.1 home theatre system.
4) Differentiate between DVD’s and a CD. (any two points)
5) Give the full form of IMEI and GPRS.

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