Analog Communication

This is an MCQ-based quiz on Analog Communication.

This includes Varactor diode, High pass Filter, Zener diode, and Low pass filter.

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Transmitters are designed usually to derive a load impedance of ________

50 ohms resistive 150 ohms resistive 250 ohms resistive 500 ohms resistive

What we use for impedance matching in RF amplifiers?

RC coupling Transformer coupling Direct coupling RF coupling

In a receiver, distortion can occur in ________

Mixer Detector IF amplifiers Either mixer or detector or IF amplifiers

Neutralization cancels unwanted feedback by bypassing the feedback to the neutral or ground plane.

True False

A resonant circuit is a simple form of bandpass filter.

True False

Aliasing refers to

Sampling of signals less than at Nyquist rate Sampling of signals greater than at Nyquist rate Sampling of signals at Nyquist rate None of the above

The amount of data transmitted for a given amount of time is called

Bandwidth Frequency Noise Signal power

Advantage of using a high frequency carrier wave is

Signal can be transmitted over very long distances Dissipates very small power Antenna height of the transmitter is reduced All of the above

If a receiver has poor capacity of blocking adjacent channel interference then the receiver has

Poor selectivity Poor Signal to noise ratio Poor sensitivity None of the above

Function of RF mixer is

Addition of two signals Multiplication of two signals Rejection of noise None of the above

The costas receiver is used for

FM signal DSB-SC signal PCM signal DM signal

In terms of signal frequency (fs) and intermediate frequency (fi), the image frequency is given by

fs + fi fs + 2fi 2fs + fi 2( fs + fi)

Properties of Hilbert transform are:

The signal and its Hilbert transform have same energy density spectrum The signal and its Hilbert transform are mutually diagonal Both a and b are correct None of the above

For a FM signal v(t) = 20 cos ( 10 * 108t + 30 sin 3000t), calculate the power dissipated by the FM wave in a 20Ω resistor.

100 Watts 10 Watts 200 Watts 20 Watts

Frequency deviation in FM is

Change in carrier frequency to the frequency above and below the centre frequency Formation of side bands The variation of the instantaneous carrier frequency in proportion to the modulating signal All of the above

Mixing is used in communication to ________

Raise the carrier frequency

Lower the carrier frequency

To altered the deviation

To change the carrier frequency to any required value

How we limit the response of a receiver to a weak signal?

By the AGC

By the noise that is generated in the receiver

By the dynamic range of the receiver

By the type of detector circuit being used

Which statement is true for low level amplitude modulation?

All RF amplifiers are of class A