Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 88 - 93 of 106

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Question 88

Communications
Spectra of AM and FM

Appeared in Year: 2016

Question

Numeric Answer▾

The amplitude of a sinusoidal carrier is modulated by a single sinusoid to obtain the amplitude modulated signal The value of the modulation index is …

Question 89

Communications
Autocorrelation and Power Spectral Density

Appeared in Year: 2016

Question

Numeric Answer▾

Two random variables X and Y are distributed according to

The probability

Question 90

Communications
Amplitude, Phase and Frequency Shift Keying (ASK, PSK, FSK)

Appeared in Year: 2015

Question

MCQ▾

The modulation scheme commonly used for transmission from GSM mobile terminal is

Choices

Choice (4)Response

a.

Walsh-Hadamard orthogonal codes

b.

Gaussian Minimum Shift Keying

c.

d.

Question 91

Communications
Circuits for Analog Communications

Appeared in Year: 2016

Question

Numeric Answer▾

Consider the signal , where t is in seconds. The Nyquist sampling rate (in samples/second) for the signal is

Question 92

Communications
Entropy, Mutual Information and Channel Capacity Theorem

Question

Numeric Answer▾

The input X to the Binary Symmetric Channel (BSC) shown in the figure is ‘1’ with probability 0.8. The cross-over probability is . If the received bit Y = 0, the conditional probability that ‘1’ was transmitted is …

The Input X to the Binary Symmetric Channel

Question 93

Communications
Superheterodyne Receivers
Edit

Appeared in Year: 2021

Question

Numeric Answer▾

Consider a super heterodyne receiver tuned to 600 kHz. If the local oscillator feeds a 1000 kHz signal to the mixer, the image frequency (in integer) is ________ kHz.

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