Communication Systems PYQs - Last 10 Years
TS EAMCET / Physics / Modern Physics / 29 recent questions
PhysicsModern Physics2016-2025
Practice 29 TS EAMCET Physics questions from Communication Systems. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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2020-2025
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Last 10 Years Communication Systems Questions
Showing 29 of 29 filtered questions.
1Communication Systems
The radio horizon of a transmitting antenna of height 39.2 m is (Radius of the Earth $=6400 \mathrm{~km}$ )
MCQ+1 / -02025
2Communication Systems
If the frequencies of the carrier wave and message signal are 1 MHz and 28 kHz respectively, then the frequencies of the side bands are
MCQ+1 / -02025
3Communication Systems
When the receiving antenna is on the ground, the range of a transmitting antenna of height 980 m is (Radius of the Earth $=6400 \mathrm{~km}$ )
MCQ+1 / -02025
4Communication Systems
The layer of the atmosphere which efficiently reflects high frequency waves particularly at night is
MCQ+1 / -02025
5Communication Systems
For commercial telephonic communication, the frequency range adequate for speech signals is
MCQ+1 / -02025
6Communication Systems
Coaxial cable, a widely used wire medium offers and approximate frequency bandwidth of
MCQ+1 / -02025
7Communication Systems
The heights of the transmitting and receiving antennas are 33.8 m and 64.8 m respectively. The maximum distance between the antennas for satisfactory communication in line of sight mode is (radius of the earth $=6400 \mathrm{~km}$ )
MCQ+1 / -02024
8Communication Systems
A message signal of peak voltage 12 V is used to amplitude modulate a carrier signal of frequency 1.2 MHz . The amplitude of the side bands is
MCQ+1 / -02024
9Communication Systems
The maximum distance between the transmitting and receiving antennas is $D$. If the heights of both transmitting and receiving antennas are doubled, then the maximum distance between the two antennas is
MCQ+1 / -02024
10Communication Systems
The process of the loss of strength of a signal while propagating through a medium is
MCQ+1 / -02024
11Communication Systems
For an amplitude modulated wave, the maximum and minimum amplitudes are found to be 10 V and 2 V respectively. Then, the modulation index is
MCQ+1 / -02024
12Communication Systems
An amplitude modulated wave is represented by $c_m(t)=10[1+0.6 \sin (1250 t)] \sin \left(10^8 t\right)$. Then modulation index is
MCQ+1 / -02023
13Communication Systems
Consider the following statements regarding digital signals
(i) provide a continuous set of values
(ii) represent values as discrete steps
(iii) can utilise binary system
(iv) are in the form of rectangular waves
Then the true statements ar...
(i) provide a continuous set of values
(ii) represent values as discrete steps
(iii) can utilise binary system
(iv) are in the form of rectangular waves
Then the true statements ar...
MCQ+1 / -02023
14Communication Systems
The loss of strength of a signal while propagating through a medium is known as
MCQ+1 / -02023
15Communication Systems
A telephonic communication service is working at a carrier frequency of 20 GHz . Only $20 \%$ of it is utilised for transmission. If each channel requires a bandwidth of 5 kHz , then the number of telephonic channels that can be transmitted...
MCQ+1 / -02023
16Communication Systems
A message signal of frequency 10 kHz is used to modulate a carrier wave of frequency 6 MHz , then the side band frequencies are
MCQ+1 / -02023
17Communication Systems
The need for modulation is
MCQ+1 / -02023
18Communication Systems
A carrier wave of peak voltage 10 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 $80 \%$ ?
MCQ+1 / -02022
19Communication Systems
For an amplitude modulated wave, the modulation index is found to be 0.5 . If the maximum amplitude is found to be 10.0 V , then the minimum amplitude is
MCQ+1 / -02022
20Communication Systems
The range of frequency bands used for standard AM broadcast is
MCQ+1 / -02022
21Communication Systems
Which of the following statements is not true?
MCQ+1 / -02022
22Communication Systems
A TV transmission antenna is 40 m tall. How much service area is can cover, if the receiving antenna is at the ground level?
(radius of the earth $=6400 \mathrm{~km}$ )
(radius of the earth $=6400 \mathrm{~km}$ )
MCQ+1 / -02022
23Communication Systems
A message signal of frequency 15 kHz is used to modulate a carrier of frequency $v_c$. If the side bands produced are 1515 kHz and 1485 kHz , then $v_c$ is
MCQ+1 / -02022
24Communication Systems
The function of a detector is to demodulate the modulated carrier wave and the steps for this process are
MCQ+1 / -02020
25Communication Systems
A message signal of frequency $50 / \pi \mathrm{kHz}$ and peak voltage of 5 V is used to modulate a carrier of frequency 1 MHz and peak voltage 20 V . The modulation index is
MCQ+1 / -02020
26Communication Systems
A message signal is super-imposed with a carrier signal. The resulting modulating signal $C_m(t)$ is given by $C_m(t)=A_1 \sin \left(\omega_1 t\right)+A_2 \sin \left(\omega_2 t\right)-A_2 \sin \left(\omega_3 t\right)$, where $\omega_2<\omeg...
MCQ+1 / -02020
27Communication Systems
The electromagnetic waves of frequency 6 GHz are used in
MCQ+1 / -02020
28Communication Systems
A message signal of frequency 10 kHz and peak voltage of 15 V is used to modulate a carrier frequency of 1 MHz and peak voltage of 30 V . Determine the modulation index.
MCQ+1 / -02020
29Communication Systems
Assertion (A) Television signals are received through sky-wave propagation.
Reason (R) The ionosphere reflects electromagnetic waves of frequencies in the range ( $3-30) \mathrm{MHz}$.
Choose the correct option.
Reason (R) The ionosphere reflects electromagnetic waves of frequencies in the range ( $3-30) \mathrm{MHz}$.
Choose the correct option.
MCQ+1 / -02020