30 Questions
What is the primary reason for maintaining a constant amplitude of the carrier in FM?
To maintain the overall amplitude of the FM wave constant
What is the deviation ratio in FM?
The ratio of maximum permitted frequency deviation to the maximum permitted audio frequency
What is the expression for the bandwidth of an FM signal?
2n × fm
What is the percentage of modulation in an FM signal?
The ratio of actual frequency deviation to the maximum allowed frequency deviation
What is the total power of an FM signal?
1.5 × Pc
What is the primary reason for modulation of a low frequency signal?
To enable transmission over long distances without attenuation
Why is the height of the antenna crucial in signal transmission?
To enable efficient radiation and reception
What is the modulation index 'm' given by?
m = m1 + m2 + m3 + ...
What is the range of audible signals?
20 Hz to 20 KHz
What is the wavelength of a 1 MHz frequency?
75 m
What is the bandwidth of an Amplitude Modulation (AM) signal?
(fc + fm) - (fc - fm)
What is the modulation index in Frequency Modulation (FM)?
The ratio of the maximum frequency deviation to the modulating frequency
What is the advantage of Frequency Modulation (FM) over Amplitude Modulation (AM)?
FM is less prone to amplitude-sensitive noise than AM
What is the power dissipated in a circuit in terms of voltage amplitude and resistance?
P = E^2 / R
What is the relationship between the modulation index and the number of sidebands in an AM signal?
The modulation index determines the number of sidebands
What is the process of changing the amplitude of a carrier wave in accordance with the amplitude of the audio frequency signal known as?
Amplitude Modulation (AM)
What remains unchanged in Amplitude Modulation (AM)?
Frequency of the carrier wave
What is the expression for the modulated wave in Amplitude Modulation (AM)?
Ec cos(ωc t) + aEc cos(ωc - ωm)t - aEc cos(ωc + ωm)t
What are the frequencies present in an Amplitude Modulation (AM) wave?
fc, fc + fm, fc - fm
What is the term for the frequencies fc + fm and fc - fm in an Amplitude Modulation (AM) wave?
Side band frequencies
What is the primary reason for the limitation of amplitude modulation?
All of the above
What determines the maximum variation in frequency of the modulated wave for a given modulating signal?
Constant of proportionality
What is the process of changing the frequency of a carrier wave in accordance with the audio frequency signal known as?
Frequency Modulation
What is the ratio of the maximum frequency deviation to the modulating frequency?
Modulation index
What is the total variation in frequency from the lowest to the highest called?
Carrier swing
What is the frequency deviation in Frequency Modulation?
The maximum change in frequency from the mean value
What is the significance of modulation index in Frequency Modulation?
It determines the number of side bands
What is the process of digitising the quantised pulses according to some code?
Coding
What is the type of modulation where the amplitude of the pulse varies in accordance with the modulating signal?
Pulse Amplitude Modulation (PAM)
What is the total power of side bands in an FM signal?
Ec2 / 2R
Test your understanding of Frequency Modulation (FM) concepts, including the properties of FM waves, bandwidth, and deviation ratio. Learn about the characteristics of FM waves and how they are used in communication systems.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
