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CBSE - Class 12 > Physics > Communication Systems Worksheets

Free CBSE - Class 12 Physics - Communication Systems worksheets

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1.
Two waves $A$ and $B$ of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?
2.
The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?
3.
Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.
4.
Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?
5.
Identify the mathematical expression for amplitude modulated wave:
1. $A_c \sin [\{\omega_c + k_1 v_m(t)\}t + \phi]$. 2. $A_c \sin \{\omega_c t + \phi + k_2 v_m(t)\}$. 3. $\{A_c + k_2 v_m(t)\} \sin (\omega_c t + \phi)$. 4. $A_c v_m(t) \sin (\omega_c t + \phi)$.
6.
Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?
1. The side band frequencies are 1506 kHz and 1494 kHz. 2. The bandwidth required for amplitude modulation is 6kHz. 3. The bandwidth required for amplitude modulation is 3 MHz. 4. The side band frequencies are 1503 kHz and 1497 kHz.
7.
Which of the following would produce analog signals and which would produce digital signals?
(ii) Musical sound due to a vibrating sitar string.
8.
Which of the following would produce analog signals and which would produce digital signals?
(iii) Light pulse.
9.
Which of the following would produce analog signals and which would produce digital signals?
(iv) Output of NAND gate.
10.
Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?
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Chapters in CBSE - Class 12 Physics

Alternating Current Worksheet Atoms Worksheet Current Electricity Worksheet Dual Nature of Radiation and Matter Worksheet Electric Charges and Fields Worksheet Electromagnetic Induction Worksheet Electromagnetic Waves Worksheet Electrostatic Potential and Capacitance Worksheet Magnetism and Matter Worksheet Moving Charges and Magnetism Worksheet Nuclei Worksheet Ray Optics and Optical Instruments Worksheet Semiconductor Electronics Worksheet Wave Optics Worksheet

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