Communication Systems
Q. Which modulation technique is most commonly used in FM radio broadcasting?
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A.
Amplitude Modulation
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B.
Frequency Modulation
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C.
Phase Modulation
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D.
Pulse Code Modulation
Solution
Frequency Modulation (FM) is the standard technique used in FM radio broadcasting due to its resistance to noise.
Correct Answer: B — Frequency Modulation
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Q. Which modulation technique is most commonly used in television broadcasting?
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A.
Amplitude Modulation (AM)
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B.
Frequency Modulation (FM)
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C.
Phase Modulation (PM)
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D.
Pulse Code Modulation (PCM)
Solution
Frequency Modulation (FM) is commonly used in television broadcasting due to its better noise immunity.
Correct Answer: B — Frequency Modulation (FM)
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Q. Which modulation technique is used to transmit digital data over an analog channel?
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A.
AM
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B.
FM
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C.
PSK
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D.
ASK
Solution
Phase Shift Keying (PSK) is a modulation technique used to transmit digital data over an analog channel.
Correct Answer: C — PSK
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Q. Which modulation technique varies the amplitude of the carrier signal?
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A.
Frequency Modulation
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B.
Amplitude Modulation
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C.
Phase Modulation
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D.
Pulse Modulation
Solution
Amplitude Modulation (AM) varies the amplitude of the carrier signal.
Correct Answer: B — Amplitude Modulation
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Q. Which of the following is a characteristic of digital communication systems?
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A.
Continuous signal representation
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B.
Higher susceptibility to noise
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C.
Easier encryption and security
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D.
Lower data transmission rates
Solution
Digital communication systems allow for easier encryption and security measures compared to analog systems.
Correct Answer: C — Easier encryption and security
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Q. Which of the following is a characteristic of digital signals?
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A.
Continuous in nature
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B.
Discrete in nature
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C.
More susceptible to noise
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D.
Require more bandwidth than analog signals
Solution
Digital signals are discrete in nature, representing data in binary form, which makes them less susceptible to noise compared to analog signals.
Correct Answer: B — Discrete in nature
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Q. Which of the following is a common application of digital modulation?
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A.
Television broadcasting
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B.
AM radio
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C.
Satellite communication
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D.
Analog audio transmission
Solution
Digital modulation is commonly used in satellite communication.
Correct Answer: C — Satellite communication
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Q. Which of the following is a common application of Phase Shift Keying (PSK)?
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A.
Television broadcasting
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B.
Satellite communication
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C.
AM radio
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D.
FM radio
Solution
Phase Shift Keying (PSK) is commonly used in satellite communication.
Correct Answer: B — Satellite communication
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Q. Which of the following is a disadvantage of frequency modulation (FM) compared to amplitude modulation (AM)?
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A.
Higher bandwidth requirement
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B.
More susceptible to noise
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C.
Lower fidelity
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D.
Easier to demodulate
Solution
FM requires a larger bandwidth than AM, which can be a disadvantage in certain communication systems.
Correct Answer: A — Higher bandwidth requirement
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Q. Which of the following is a disadvantage of Frequency Modulation (FM)?
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A.
Less bandwidth
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B.
More noise immunity
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C.
Complex receiver design
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D.
Simple implementation
Solution
FM requires a more complex receiver design compared to AM.
Correct Answer: C — Complex receiver design
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Q. Which of the following is NOT a type of digital modulation?
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A.
Amplitude Shift Keying (ASK)
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B.
Frequency Shift Keying (FSK)
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C.
Phase Shift Keying (PSK)
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D.
Continuous Wave Modulation (CWM)
Solution
Continuous Wave Modulation (CWM) is not a type of digital modulation; it refers to analog modulation techniques.
Correct Answer: D — Continuous Wave Modulation (CWM)
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Q. Which type of noise is most commonly associated with communication systems?
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A.
White noise
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B.
Impulse noise
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C.
Thermal noise
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D.
Shot noise
Solution
White noise is the most commonly associated noise in communication systems, affecting signal quality.
Correct Answer: A — White noise
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