Communication Systems - ECE Questions and Answers

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AC hum is picked up from power cables

True

False

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PIL tube means

Picture in Line Tube

Precision in Line Tube

Pairing in Line Tube

Pattern in Line Tube

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In an SSB transmitter one is most likely to find

class C audio amplifier

tuned modulator

class B RF amplifier

class AB power amplifier

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For a given data rate, the bandwidth β_p of a BPSK signal and the bandwidth β₀ of the OOK signal are related as

β_p = 2β₀

β_p = β₀

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A direct radiating cone type loudspeaker attenuates :

medium range frequencies

very low frequencies

high frequencies

very low and high frequencies

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The advantage of pulse modulation is

the transmitted power can be concentrated into short bursts

the time intervals between pulses can be filled with sample values from other message

pulse wave may obtain appreciable D.C. and low frequency content

all of the above

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Sparking affects amplitude modulation.

True

False

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For low impedance SAW filter the most suitable material for substrate of SAW filter is

PZT ceramics

ZnO

Lithium titanate

Lithium neobate