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CBSE - XII Science - Physics - Communication Systems
what is 5g technology and how it works?
Asked by sagarmishra
8th September 2023,
1:55 PM
CBSE - XII Science - Physics - Communication Systems
What is amplitude modulation? Explain the block diagram of a practical AM transmitter.
Asked by tanyagupta1874
17th January 2022,
10:16 PM
CBSE - XII Science - Physics - Communication Systems
A carrier wave of peak voltage 15V is used to transmit a message signal. Findthe peak voltage of the modulating signal in order to have a modulation index of 60%.
Asked by cupatil
7th March 2018,
11:22 PM
CBSE - XII Science - Physics - Communication Systems
how signals is divided meaning space satellite were in space how this signals would be divided into the whole globe is there is frequency role which handle all this communation system or and why only fibre optics used and what is the role of bandwidth in this system pleaes exlain with draw or with examples
Asked by saggugurupal
26th November 2016,
1:29 PM
CBSE - XII Science - Physics - Communication Systems
explain gain in dB = 10log(Po/P)..............................................................and one more question ....plzzz explian with steps in an amplitude modulated wave for audio frequency of 500 cycles/s the apprioted carrier frequency will be...... explain by steps
Asked by Farooq Ahmad
13th April 2016,
8:08 PM
CBSE - XII Science - Physics - Communication Systems
Draw a plot of the variation amplitude versus' w'(angular velocity) for an amplitude modulated wave.Define modulation index .State its importence for effective amplitude modulation.
Asked by Rajeev
21st February 2016,
11:13 PM
CBSE - XII Science - Physics - Communication Systems
Define the term Modulation index for an AM wave. What would be the modulation index for an AM wave for which the maximum amplitude is 'a' while the minimum amplitude id 'b' ?
Asked by vinitapahel123
13th December 2015,
12:21 PM
CBSE - XII Science - Physics - Communication Systems
(a) State three important factors showing the need for translating a low frequency signal into a high frequency wave before transmission. (b) Draw a sketch of a sinusoidal carrier wave along with a modulating signal and show how these are superimposed to obtain the resultant amplitude modulated wave.
Asked by Topperlearning User
8th July 2015,
1:54 PM
CBSE - XII Science - Physics - Communication Systems
HOW to make SOUND DETECTOR RADAR
EXPLAIN EACH STEP PLEASE
please help me this is my PROJECT
Asked by Shahwar
14th June 2015,
2:09 PM
CBSE - XII Science - Physics - Communication Systems
Draw a plot of the variation of amplitude with for an amplitude modulated wave. Define modulation index. State its importance for effective amplitude modulation.
Asked by Topperlearning User
9th July 2014,
11:12 AM
CBSE - XII Science - Physics - Communication Systems
Why is frequency modulation preferred over amplitude modulation for transmission of music?
Asked by Topperlearning User
9th July 2014,
10:49 AM
CBSE - XII Science - Physics - Communication Systems
Define the term modulation. Name three different types of modulations used for a message signal using a sinusoidal continuous carrier wave. Explain the meaning of any one of these.
Asked by Topperlearning User
9th July 2014,
10:43 AM
CBSE - XII Science - Physics - Communication Systems
1.If a signal of frequency Wm is used to modulate a carrier wave of frequency Wc, which are the frequencies contained in the modulated signal other than Wc? 2.State the formula for modulation index in terms of limiting values of amplitude of modulated wave.
Asked by Topperlearning User
9th July 2014,
10:34 AM
CBSE - XII Science - Physics - Communication Systems
A transmitting antenna at the top of a tower has a height of 22 m and the height of the receiving antenna 40 m. What is the maximum distance between them, for satisfactory communication in LOS mode ? ( Radius of earth = 6400 km)
Asked by Topperlearning User
9th July 2014,
10:33 AM
CBSE - XII Science - Physics - Communication Systems
1.Define modulation index. 2.What is the preferable value of modulation index in AM system, high value or moderate value?
Asked by Topperlearning User
9th July 2014,
9:42 AM
CBSE - XII Science - Physics - Communication Systems
A modulating signal has zero dc component and peak to peak voltage of 11 V. It is used to amplitude modulate a carrier of peak voltage of 10 V. Calculate the modulation index.
Asked by Topperlearning User
9th July 2014,
9:27 AM
CBSE - XII Science - Physics - Communication Systems
Why do we need amplification of modulated signal in a transmitter and again need amplification before detection?
Asked by Topperlearning User
9th July 2014,
9:05 AM
CBSE - XII Science - Physics - Communication Systems
Mention three advantages and three disadvantages of Frequency Modulation.
Asked by Topperlearning User
9th July 2014,
8:35 AM
CBSE - XII Science - Physics - Communication Systems
Which type of modulation is used for the waves which are not continuous but are in the form of pulses?
Asked by Topperlearning User
8th July 2014,
1:27 PM
CBSE - XII Science - Physics - Communication Systems
What is detector? Draw the block diagram of a receiver of AM wave.
Asked by Topperlearning User
8th July 2014,
1:13 PM
CBSE - XII Science - Physics - Communication Systems
Analytically explain the process of amplitude modulation. What is the frequency spectrum of AM signal?
Asked by Topperlearning User
8th July 2014,
12:59 PM
CBSE - XII Science - Physics - Communication Systems
Explain with the help of diagram, how the process of modulation is carried out in radio broadcast?
Asked by Topperlearning User
8th July 2014,
11:23 AM
CBSE - XII Science - Physics - Communication Systems
Give three reasons which make modulation of message (or information) essential in a communication system.
Asked by Topperlearning User
8th July 2014,
11:14 AM
CBSE - XII Science - Physics - Communication Systems
Write main advantages and disadvantages of the AM technique.
Asked by Topperlearning User
8th July 2014,
11:00 AM
CBSE - XII Science - Physics - Communication Systems
What do you understand by frequency modulation? A signal of 10 kHz and peak voltage 20 V is used to modulate a carrier wave of frequency 10 MHz and peak voltage 40 V.Calculate a) depth of modulation .b) side bands frequencies.
Asked by Topperlearning User
8th July 2014,
10:36 AM
CBSE - XII Science - Physics - Communication Systems
What is the importance of depth of modulation?
Asked by Topperlearning User
8th July 2014,
10:05 AM
CBSE - XII Science - Physics - Communication Systems
With the help of diagram, explain the term amplitude modulation qualitatively.
Asked by Topperlearning User
8th July 2014,
9:45 AM
CBSE - XII Science - Physics - Communication Systems
What do you understand by the term modulation?
Asked by Topperlearning User
8th July 2014,
9:23 AM
CBSE - XII Science - Physics - Communication Systems
A transmitting antenna at the top of a tower has a height of 36m and the height of the receiving antenna is 49m. What is the maximum distance between them, for satisfactory communication in the LOS mode? (Radius of earth = 6400km)
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Communication Systems
What would be the modulation index for an amplitude modulated wave for which the maximum amplitude is 'a' while the minimum amplitude is 'b'.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Communication Systems
A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal, in order to have a modulation index of 75%.
Asked by Topperlearning User
4th June 2014,
1:23 PM
