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CBSE - Class 12 > Physics > Communication Systems Worksheets

Free CBSE - Class 12 Physics - Communication Systems worksheets

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1.
Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.
2.
Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?
3.
A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with $\lambda$
1. ~ 400 m. 2. ~ 25 m. 3. ~ 150 m. 4. ~ 2400 m.
4.
A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be
1. 1.003 MHz and 0.997 MHz. 2. 3001 kHz and 2997 kHz. 3. 1003 kHz and 1000 kHz. 4. 1 MHz and 0.997 MHz.
5.
A message signal of frequency $\omega_m$ is superposed on a carrier wave of frequency $\omega_c$ to get an amplitude modulated wave (AM). The frequency of the AM wave will be
1. $\omega_m$. 2. $\omega_c$. 3. $\frac{\omega_c + \omega_m}{2}$. 4. $\frac{\omega_c - \omega_m}{2}$.
6.

I-V characteristics of four devices are shown in Fig. 15.1 Identify devices that can be used for modulation:

1.

‘i’ and ‘iii’.

 2.

only ‘iii’.

 3.

‘ii’ and some regions of ‘iv’.

 4.

All the devices can be used.
7.
A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to
1. poor selection of modulation index (selected $0 < m < 1$) 2. poor bandwidth selection of amplifiers. 3. poor selection of carrier frequency 4. loss of energy in transmission.
8.
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. $A_c v_m(t) \sin (\omega_c t + \phi)$.
9.
An audio signal of 15kHz frequency cannot be transmitted over long distances without modulation because
1. the size of the required antenna would be at least 5 km which is not convenient. 2. the audio signal can not be transmitted through sky waves. 3. the size of the required antenna would be at least 20 km, which is not convenient. 4. effective power transmitted would be very low, if the size of the antenna is less than 5 km.
10.
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.
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Chapters in CBSE - Class 12 Physics

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

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