CBSE 12th Standard Physics Subject Communication Systems HOT Questions 2 Mark Questions 2021
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CBSE 12th Standard Physics Subject Communication Systems HOT Questions 2 Mark Questions 2021
12th Standard CBSE
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Reg.No. :
Physics
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In the given block diagram of a receiver identify the boxes labelled as X and Y and write their functions.
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(a) Describe briefly the three factors which justify the need for translating a low frequency signal into high frequencies before transmission.
(b) Figure shows a block diagram of a detector for AM signal.
Draw the waveforms for the
(i) input AM wave at A,
(ii) output B at the rectifier, and (iii) output signal at C. -
Differentiate between (i) PAM and (ii) PPM
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An AM wave is represented by the expression: v = 5 (1 + 0.6 cos 6280 t) sin 221 x 104 t volts
(i) What are the maximum and minimum amplitudes of the AM wave.
(ii) What frequency components are contained in the modulated wave -
The antenna current of an AM transmitter is 8A when only carrier is sent but it increases to 8.93A when the carrier is sinusoidally modulated. Find the percent-age modulation index
