Communication

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What is the primary reason for maintaining a constant amplitude of the carrier in FM?

To reduce the total transmitted power

To prevent interference from other signals

To maintain the overall amplitude of the FM wave constant (correct)

To ensure the side bands are separated from each other by the frequency of the modulating signal

What is the deviation ratio in FM?

The ratio of the modulating signal frequency to the carrier frequency

The ratio of actual frequency deviation to the maximum allowed frequency deviation

The ratio of side bands to the carrier frequency

The ratio of maximum permitted frequency deviation to the maximum permitted audio frequency (correct)

What is the expression for the bandwidth of an FM signal?

fm × (fc + 2fm)

2n × fm (correct)

2 × fm

fc × (fm + 2fm)

What is the percentage of modulation in an FM signal?

The ratio of actual frequency deviation to the maximum allowed frequency deviation Signup and view all the answers

What is the total power of an FM signal?

1.5 × Pc Signup and view all the answers

What is the primary reason for modulation of a low frequency signal?

To enable transmission over long distances without attenuation Signup and view all the answers

Why is the height of the antenna crucial in signal transmission?

To enable efficient radiation and reception Signup and view all the answers

What is the modulation index 'm' given by?

m = m1 + m2 + m3 + ... Signup and view all the answers

What is the range of audible signals?

20 Hz to 20 KHz Signup and view all the answers

What is the wavelength of a 1 MHz frequency?

75 m Signup and view all the answers

What is the bandwidth of an Amplitude Modulation (AM) signal?

(fc + fm) - (fc - fm) Signup and view all the answers

What is the modulation index in Frequency Modulation (FM)?

The ratio of the maximum frequency deviation to the modulating frequency Signup and view all the answers

What is the advantage of Frequency Modulation (FM) over Amplitude Modulation (AM)?

FM is less prone to amplitude-sensitive noise than AM Signup and view all the answers

What is the power dissipated in a circuit in terms of voltage amplitude and resistance?

P = E^2 / R Signup and view all the answers

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 Signup and view all the answers

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) Signup and view all the answers

What remains unchanged in Amplitude Modulation (AM)?

Frequency of the carrier wave Signup and view all the answers

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 Signup and view all the answers

What are the frequencies present in an Amplitude Modulation (AM) wave?

fc, fc + fm, fc - fm Signup and view all the answers

What is the term for the frequencies fc + fm and fc - fm in an Amplitude Modulation (AM) wave?

Side band frequencies Signup and view all the answers

What is the primary reason for the limitation of amplitude modulation?

All of the above Signup and view all the answers

What determines the maximum variation in frequency of the modulated wave for a given modulating signal?

Constant of proportionality Signup and view all the answers

What is the process of changing the frequency of a carrier wave in accordance with the audio frequency signal known as?

Frequency Modulation Signup and view all the answers

What is the ratio of the maximum frequency deviation to the modulating frequency?

Modulation index Signup and view all the answers

What is the total variation in frequency from the lowest to the highest called?

Carrier swing Signup and view all the answers

What is the frequency deviation in Frequency Modulation?

The maximum change in frequency from the mean value Signup and view all the answers

What is the significance of modulation index in Frequency Modulation?

It determines the number of side bands Signup and view all the answers

What is the process of digitising the quantised pulses according to some code?

Coding Signup and view all the answers

What is the type of modulation where the amplitude of the pulse varies in accordance with the modulating signal?

Pulse Amplitude Modulation (PAM) Signup and view all the answers

What is the total power of side bands in an FM signal?

Ec2 / 2R Signup and view all the answers