GATE 2019: Communication Quiz 5 (App update required to attempt this test)

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Question 1

A standard television picture is composed of approximately 300000 basic picture elements. Each of these elements can assume 10 distinguishable brightness levels with equal probability. The information content of a television picture frame is ________ k bits.

• A512
• B996
• C1000
• D1024

Question 2

A source generates eight equiprobable symbols. What would be the code length?

• A2bits/Symbol
• B3bits/Symbol
• C1bit/Symbol
• D4bit/Symbol

Question 3

An analog signal having 2 kHz bandwidth is sampled at 1.2 times the Nyquist rate and each sample is quantized into 128 equally likely levels, assume that the successive samples are statistically independent, the information rate of this source is ___ kbps.

Answer

Question 4

An information source generates a binary sequence {a_n}. an can take one of the two possible values —1 and+1 with equal probability and are statistically independent and identically distributed. This sequence is preceded to obtain another sequence , as . The sequence is used to modulate a pulse g(t) to generate the baseband signal

If there is a null at in the power spectral density of X(t), then k is _____

• A-1
• B-4
• C4
• Dnone of these

Question 5

A 2 kHz channel has a signal to noise ratio of 24 dB. The change in the maximum chaanel capacity if the channel bandwidth is reduced to a quarter of the original value is

• AIncreased by a factor 4
• BDecreased by a factor 4
• CIncreased by a factor 2
• DDecreased by a factor 2

Question 6

The channel capacity of an infinite bandwidth channel is 54 kbps. If the signal power required at the receiver is 0.1 mW, the two sided noise spectral density is__________10^-9W/Hz

• A1.33
• B2.33
• C0.33
• D13.3

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