Electronic Devices and Circuit Theory-Communications - Practice Questions

Question 1

An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.

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Question 2

Amplitude modulation is the process of varying the radio frequency with the modulating frequency.

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Question 3

The mixer takes the RF signal along with the audio signal to produce the IF signal.

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Question 4

Amplitude modulation is a ________ process.

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Question 5

If a 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the upper-side frequency is ________ kHz.

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Question 6

A balanced modulator is used in standard AM to obtain the sum and difference frequencies.

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Question 7

The intermediate frequency in a standard AM receiver is

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Question 8

A phase-locked loop (PLL) is a feedback circuit consisting of a

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Question 9

The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency.

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Question 10

In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?

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