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ESE EC 2018 Achiever Study Plan: Communication Systems Quiz 2
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Question 1
The advantage of π/4 QPSK compared to conventional QPSK is ?
Question 2
Identify the modulation schemes for the shown signal constellation diagram.
Question 3
What is the limit of 
, below which reliable communication is not possible?
, below which reliable communication is not possible?Question 4
The effect of channel coding in communication
channel is
channel is
Question 5
What is the maximum data rate that can be transmitted using a QPSK odulation with a roll-off factor of 0.2 for a 36 MHz transponder?
Question 6
Determine the correlation coefficient between the pulses x(f) and y(t) shown in the figure below:
Question 7
A lossless matching circuit is shown in the figure
The values satisfying the matching condition are:
The values satisfying the matching condition are:
Question 8
The input to a linear delta modulator is a sinusoidal signal having a peak amplitude of 1 volt. The maximum input signal frequency is 4000 Hz. The input signal is sampled at 8 times the Nyquist rate. The step size for a 800 Hz input, assuming no slope overload, is
Question 9
Assertion (A): In amplitude modulation systems the value of modulation index should be around 1.
Reason (R): The power carried in the intelligence carrying sidebands increases with the modulation index.
Reason (R): The power carried in the intelligence carrying sidebands increases with the modulation index.
Question 10
If n1 and n2 are refractive indices of the core and cladding respectively, the maximum acceptance angle at the air-core interface should be
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Jun 9ESE & GATE EC
