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Aashish Rohilla
Subject: Physics
, asked on 16/2/18
a carrier wave Ec = 10 sin 6.28 * 106 t is used to transmit audio signal Em = 6 sin 6.38 * 10^3 t . What will be the 1 central frequency if the carrier wave? 2 side frequency in the amplitude modulated wave 3 modulation index
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
a certain radio station uses carrier wave of frequency 150 Khz produced by an inductor of 1 micro henry connected to a capacitor of capacitance C .calculate c
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
represent the variation of power carried by a signal with wavelength of carrier signal
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
why the transmission of TV signals is possible only through space waves what method is employed to increase the range of TV transmission.
Answer
2
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
write three different method of modulation used in transmission system used to transmit analogue and digital signal how do they differ from each other
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
write any four factor which affect the design of a communication system
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
the los communication from a TV tower can be received on a ground up to a distance of 30 km suggest a method to receive the programmer at a distance of 31 km from the tower.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 16/2/18
draw a diagram to show the distance up to which the signal from a TV tower can be received on earth and obtain an expression for the distance. by means of a diagram show that ordered the transmission Tower More will be the range
Answer
1
Shivam Sharma
Subject: Physics
, asked on 16/2/18
Solve this:
Q). The carrier wave is given by
C
t
=
2
sin
8
πt
volt.
The modulating signal is a square wave as shown. Find modulation index.
Answer
1
Archana
Subject: Physics
, asked on 12/2/18
Q). Do we have to study this table for board exams?? will questions come from this table??
Some important wireless communication frequency bands
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 6/2/18
18. Justify the following statement.
(a) Long distance radio broadcasts use short wave bands.
(b) The thin ozone layer at the top of the stratosphere is crucial for human survival.
(c) Satellites are used for long distance TV transmission.
19. Explain the term 'modulation'. Define modulation factor. Sketch the amplitude modulated wave when the amplitude of the signal wav is (i) equal and (ii) 1.5 times, the amplitude of the carrier wave.
20. Define the resolving power of a microscope. Derive an expression for it. How is its value increased?
Answer
1
Prince Second
Subject: Physics
, asked on 1/2/18
Wht are the advan abd disadvantahes ofsatellitle communication
Answer
1
Prince Second
Subject: Physics
, asked on 1/2/18
What are the uses of satellitke communicatoon
Answer
1
Prince Second
Subject: Physics
, asked on 1/2/18
What are the uses of sky wave propogation. Pls tell uses only
Answer
1
Prince Second
Subject: Physics
, asked on 1/2/18
What are the uses of ground wavw propogation?
Answer
1
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What are you looking for?
Q). The carrier wave is given by
volt.
The modulating signal is a square wave as shown. Find modulation index.
Some important wireless communication frequency bands
(a) Long distance radio broadcasts use short wave bands.
(b) The thin ozone layer at the top of the stratosphere is crucial for human survival.
(c) Satellites are used for long distance TV transmission.
19. Explain the term 'modulation'. Define modulation factor. Sketch the amplitude modulated wave when the amplitude of the signal wav is (i) equal and (ii) 1.5 times, the amplitude of the carrier wave.
20. Define the resolving power of a microscope. Derive an expression for it. How is its value increased?