|
Why is an AM signal likely to be more noisy than a FM signal upon transmission through a channel?
|
|
0
|
2537
|
December 10, 2016
|
|
Compute the L-C product of a tuned amplifier circuit required to generate a, carrier wave of 1 MHz for amplitude modulation
|
|
0
|
1160
|
December 10, 2016
|
|
In the given block diagram of a receiver, identify the boxes labelled as X and Y and write their functions
|
|
1
|
2253
|
December 10, 2016
|
|
Define modulation index.Why is its value kept,in practice less than one?
|
|
1
|
6064
|
December 10, 2016
|
|
A modulating signal is a square wave as shown in the figure
|
|
1
|
2765
|
December 10, 2016
|
|
An amplitude modulated wave is as shown in the figure. Calculate
|
|
1
|
2491
|
December 10, 2016
|
|
Write physical significance of modulation index
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|
0
|
8027
|
December 10, 2016
|
|
Which mode of propagation is used by short wave
|
|
1
|
3384
|
December 10, 2016
|
|
For ground wave transmission, size of antenna l should be comparable to wavelength of the signal
|
|
1
|
3156
|
December 10, 2016
|
|
Distinguish between any two types of propagation of electromagnetic waves
|
|
1
|
7137
|
December 10, 2016
|
|
If the sum of the heights of transmitting and receiving antenna
|
|
1
|
4694
|
December 10, 2016
|
|
Why is communication using line of sight mode
|
|
1
|
2533
|
December 10, 2016
|
|
Which mode of propagation is suitable for television broadcast
|
|
1
|
4663
|
December 10, 2016
|
|
Why is this mode of propagation limited to frequencies upto a few MHz?
|
|
1
|
1087
|
December 10, 2016
|
|
What is the range of frequencies used for TV transmission?
|
|
1
|
4503
|
December 10, 2016
|
|
What fraction of the surface area of the earth
|
|
1
|
2202
|
December 10, 2016
|
|
“A communication satellite is essentially a repeater station in space.”
|
|
1
|
1600
|
December 10, 2016
|
|
Distinguish between sinusoidal and pulse-shaped signals
|
|
1
|
2771
|
September 9, 2016
|
|
A (sinusoidal) carrier wave
|
|
1
|
2359
|
September 9, 2016
|
|
Write three important factors which justify the need of modulating
|
|
1
|
2566
|
September 9, 2016
|
|
Write two basic modes of communication
|
|
1
|
4997
|
September 9, 2016
|
|
Draw a block diagram of a detector for AM signal and show,
|
|
1
|
5566
|
September 9, 2016
|
|
Explain any two factors which justify the need of modulating a low frequency signal
|
|
1
|
7187
|
September 9, 2016
|
|
Define modulation index
|
|
1
|
6885
|
September 9, 2016
|
|
A carrier wave of peak voltage 12 V is used to transmit a message signal
|
|
1
|
6675
|
September 9, 2016
|
|
In the block diagram of a simple modulator for obtaining
|
|
1
|
4684
|
September 9, 2016
|
|
Describe briefly the three factors which justify
|
|
1
|
2842
|
September 9, 2016
|
|
A carrier wave of peak voltage 12 V is used to transmit
|
|
1
|
593
|
September 9, 2016
|
|
A carrier wave of frequency 1.5 MHz and amplitude
|
|
1
|
4514
|
September 9, 2016
|
|
A message signal of frequency
|
|
1
|
2106
|
September 9, 2016
|