1
GATE ECE 2023
MCQ (Single Correct Answer)
+2
-0.67

Let x$$_1$$(t) and x$$_2$$(t) be two band-limited signals having bandwidth $$B=4\pi\times10^3$$ rad/s each. In the figure below, the Nyquist sampling frequency, in rad/s, required to sample y(t), is

GATE ECE 2023 Communications - Analog Communication Systems Question 3 English

A
$$20\pi\times10^3$$
B
$$40\pi\times10^3$$
C
$$8\pi\times10^3$$
D
$$32\pi\times10^3$$
2
GATE ECE 2022
MCQ (Single Correct Answer)
+2
-0.67

Consider an FM broadcast that employs the pre-emphasis filter with frequency response

$${H_{pe}}(\omega ) = 1 + {{j\omega } \over {{\omega _0}}}$$,

where $$\omega$$0 = 104 rad/sec.

For the network shown in the figure to act as a corresponding de-emphasis filter, the appropriate pairs of (R, C) values is/are ____________.

GATE ECE 2022 Communications - Analog Communication Systems Question 4 English

A
R = 1 k$$\Omega$$, C = 0.1 $$\mu$$F
B
R = 2 k$$\Omega$$, C = 1 $$\mu$$F
C
R = 1 k$$\Omega$$, C = 2 $$\mu$$F
D
R = 2 k$$\Omega$$, C = 0.5 $$\mu$$F
3
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 ___________
Your input ____
4
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 __________
Your input ____
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