Distribution of Marks in Electronics 1 Paper
H.S.C-
Practical- 50 marks
Theory - 50 marks
A) Distribution of marks in Question Paper
Sr. No Topic % Weightage Of marks in Question Paper
1 Measuring Instruments 15
2 Power Supplier 20
3 Transducers 10
4 Op-AMP 25
5 Modern Communication 20
System
6 Special IC 10
B) Distribution of marks in Practical
Journal & Assignments =10 marks
Project = 10 marks
Practical Exam = 25 marks
Oral Exam = 5 marks
Note-
1) Students have to perform 12 practicals in Electronics 1 Paper.
2) Students have to complete 1 project in each Electronics paper.
H.S.C Board Exam Question Paper Format ( Electronics 1)
Q.1
A) MCQ (4 marks)
B) Attempt any 2 out of 3 (6 marks)
Q.2
A) Attempt any 2 out of 3 (6 marks)
B) Attempt any 1 out of 2 (4 marks)
Q.3
A) Attempt any 2 out of 3 (6 marks)
B) Attempt any 1 out of 2 (4 marks)
Q.4
A) Attempt any 2 out of 3 (6 marks)
B) Attempt any 1 out of 2 (4 marks)
Q.5 ( There is two Que. For this Que. No.)
A) Attempt any 2 out of 3 (6 marks)
B) Attempt any 1 out of 2 (4 marks)
Chapter-5
Modern Elex. Communication System
Content :-
Introduction:- Definition of communication, Exs. Of communication system.
Block diagram of Generalised Communication System
Types of Communication System
Comparison between –
1) Simplex & duplex types of Communication system
2) Analog & Digital types of Communication system
Modulation & its Necessity
Types of Modulation
Amplitude modulation- Definition, AM Equation, AM Spectrum,
Modulating Index & its significance, Importance of Sidebands in AM,
Drawbacks of AM, Numericals.
Frequency modulation- Definition, Modulating Index , FM Spectrum &
sidebands in FM, Various Terms in FM, Numericals.
Satellite communication.
Synchronous & Asynchronous communication, serial and parallel
communication.
Modem- Block diagram , FSK Modem.
Computer Networking & Network topology.
Fibre Optic Communication.
FAX (Facsimile).
RADAR
Cellular Communication .
Introduction-
What is communication?
• Communication – It is a basic process of exchanging information ,
knowledge, ideas , messages, maps, important documents etc. from
source to destination.
• Examples of communication system- Face to face communication, satellite
communication, fibre optic communication, wireless communication etc.
Block diagram of Generalised Communication System
Figure for Block Diagram Generalised Communication System
Explanation for Block Diagram-
Basic elements of communication system are-
Transmitter (Tx)
Channel or communication media
Receiver (Rx)
Transmitter (Tx):-
• Transmitter converts the input information ( i.e message, voice, picture
signal, binary code) into an electrical signal in a standard form suitable for
long distance communication.
• Example of Tx- In radio communication, sound signal is converted into an
electrical signal by microphone.
• Transmitter also processes this electrical signal with the help of modulation
process & radiates this modulated signal in the form of electromagnetic
signal in the space.
Channel or communication media:-
• Channel is a medium through which transmitted signal gets propagated
with the speed of light.
• When the transmitted signal passes through the channel, signals amplitude
( i.e. strength) gets attenuated and the noise gets picked up by these
transmitting signals.
• Noise is an unwanted/unavoidable random signal which is generated
internally due to the components effect or may be picked up externally by
the system.
Receiver (Rx)-
• Receivers receive the radiated or transmitted signals through a medium and
processed ( i.e. demodulated) to get the original information back in the
standard form.
• Example- In a TV system, received electrical video signals are processed by
means of demodulation and produce pictures by using CRT.
• The functions of the receiver are-
1. Interceptions of signals using antenna
2. Selection of desired signal by tune & mixture circuit
3. Amplification of selected signal by RF Amplifier( Radio Frequency Amplifier)
& IF (Intermediate Frequency Amplifier)
4. Demodulation of useful ( original) information by demodulator circuit.
5. Amplification of recovered signals using AF Amplifier.
6. Conversion of signal into a standard understandable form.
