ESE 2021 Technical Quiz 63 || Noise

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Question 1

A system has receiver noise resistance of 50Ω and if it is connected to an antenna with an output resistance of 50Ω ,then the noise figure of the system is

• A1
• B2
• C50
• D101

Question 2

During transmission over a certain binary communication channel, bit error occurs independently with probability p. The probability of atmost one bit in error in a block of n bits is given by

• Apⁿ
• B1 - pⁿ
• C
• D

Question 3

The AM signal gets added to a noise with Power Spectral Density S_n(f) given in the figure below. The ratio of average sideband power to mean noise power would be:

• A
• B
• C
• D

Question 4

A satellite receiver with noise figure of 5.6 dB has a bandwidth of 16 kHz and consist of a preamplifier with noise temperature 147 K and a gain of 30 dB. If the reference temperature is 297 K the equivalent noise temperature of the receiver is

• A150 K
• B219.64 K
• C146.3 K
• D485.18 K

Question 5

In a delta modulation technique(Single integration), sampling of voice is done at 60Khz. If the maximum signal amplitude is 1volt, and signal bandwidth of voice is 3 kHz, then determine signal to noise ratio assuming the input signal to be sinusoidal in nature.

• A2.3mW
• B3.4mW
• C1.64mW
• D4.3mW

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