modulation Quiz
easy
15 Questions
Question 1 of 15
What is the primary purpose of modulation in communication systems?
Modulation shifts the signal's frequency, enabling efficient transmission over long distances and avoiding interference.
Question 2 of 15
Which of the following is NOT a type of modulation?
Resistance Modulation (RM) is not a standard type of modulation.
Question 3 of 15
In Amplitude Modulation (AM), what parameter of the carrier signal is varied?
In AM, the amplitude of the carrier wave is changed according to the message signal.
Question 4 of 15
In Frequency Modulation (FM), what parameter of the carrier signal is varied?
In FM, the frequency of the carrier wave is changed according to the message signal.
Question 5 of 15
What does a modulator do?
A modulator combines the message signal (information) with a carrier signal.
Question 6 of 15
What is the carrier signal in modulation?
The carrier signal is a high-frequency wave used to carry the message signal.
Question 7 of 15
What is the role of a demodulator?
A demodulator extracts the original message signal from the modulated carrier signal.
Question 8 of 15
Which modulation technique is known for its better noise immunity?
FM is less susceptible to noise than AM due to noise's impact on amplitude, which FM avoids modulating.
Question 9 of 15
What is the process of changing the phase of a carrier signal according to the message signal called?
Phase Modulation (PM) involves altering the phase of the carrier wave.
Question 10 of 15
What is 'bandwidth' in the context of modulated signals?
Bandwidth is the range of frequencies the modulated signal uses.
Question 11 of 15
What does 'message signal' refer to in modulation?
The message signal is the information to be transmitted, which modulates the carrier.
Question 12 of 15
Which of these is a type of AM?
DSB-SC (Double Sideband-Suppressed Carrier) is a form of Amplitude Modulation.
Question 13 of 15
What is the modulation index?
The modulation index describes how much the carrier is changed by the message signal.
Question 14 of 15
What is the purpose of sidebands in AM?
Sidebands contain the frequency components created when modulating the carrier signal.
Question 15 of 15
In which form of modulation is the carrier signal completely removed after modulation?
In DSB-SC, the carrier signal is suppressed, resulting in only the sidebands.
1 / 15