1
GATE ECE 2017 Set 2
Numerical
+2
-0
The un-modulated carrier power in an AM transmitter is 5kW. This carrier is modulated by a sinusoidal modulating signal. The maximum percentage of modulation is 50%. If it is reduced to 40%, then the maximum un-modulated carrier power (in kW) that can be used without overloading the transmitter is ___________
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2
GATE ECE 2017 Set 2
Numerical
+2
-0
A modulating signal given By $$x\left(t\right)=5\sin\left(4\mathrm\pi10^3\mathrm t\;-\;10\mathrm{πcos}2\mathrm\pi10^3\mathrm t\right)$$ V is fed to a phase modulator with phase deviation constant kp=0.5rad/V. If the carrier frequency is 20 kHz, the instantaneous frequency (in kHz) at t = 0.5 ms is __________
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3
GATE ECE 2017 Set 2
MCQ (Single Correct Answer)
+1
-0.3
Which one of the following graphs shows the Shannon capacity (channel capacity) in bits of a memory less binary symmetric channel with crossover probability P?
A
GATE ECE 2017 Set 2 Communications - Fundamentals of Information Theory Question 20 English Option 1
B
GATE ECE 2017 Set 2 Communications - Fundamentals of Information Theory Question 20 English Option 2
C
GATE ECE 2017 Set 2 Communications - Fundamentals of Information Theory Question 20 English Option 3
D
GATE ECE 2017 Set 2 Communications - Fundamentals of Information Theory Question 20 English Option 4
4
GATE ECE 2017 Set 2
Numerical
+1
-0
A sinusoidal message signal is converted to a PCM signal using a uniform quantizer. The required signal to quantization noise ratio (SQNR) at the output of the quantizer is 40dB. The minimum number of bits per sample needed to achieve the desired SQNR is ________ .
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