Higher Study | Communication Systems

What is the automatic frequency control voltage of the FM transmitter VCO?

ক

DC voltage

খ

Sine wave voltage

গ

Square wave voltage

ঘ

Ramp voltage

Which of the following phase modulation applications is INCORRECT?

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It is an integral element of many digital transmission coding schemes that support an ample range of wireless technologies such as GSM and Wi-Fi.

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This is very useful in radio waves transmission.

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It is used in digital synthesizers for transferring signals.

ঘ

It is also used in satellite television network

The modulation technique in which frequency of the carrier wave is changed with respect to the modulating wave is called:

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Pulse code modulation

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Frequency modulation

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Amplitude modulation

ঘ

Phase modulation

Which of the following is not a component of basic Phase-Locked Loop (PLL)?

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Phase detector

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Voltage controlled oscillator

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Schmitt Trigger

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Low-pass filter

Which is true in a frequency modulated system ?

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Variation of carrier amplitude does not affect quality of reception

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Amplitude of carrier is varied according to modulating signal

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The transmission does not require line of sight between transmitter and reciever

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Receiver uses diode detector

Which method from the following is used in demodulating FM wave?

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Distribution discrimination method

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Amplitude discrimination method

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Delay discrimination method

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Phase discrimination method

What bandwidth is needed for an FM signal that has a peak deviation of +3 kHz and handles audio signals from 200 Hz to 5 kHz ?

ক

6 kHz

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16 kHz

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10 kHz

ঘ

9.6 kHz

Which of the following is NOT the advantage of frequency modulation ?

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Less interference and noise

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Adjacent FM channels are separated by guard bands

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More convenient receiver and transmitter

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Power consumption is less as compared to AM

Higher Study | Communication Systems | Angle Modulation