1
GATE ECE 2015 Set 1
Numerical
+2
-0
In the system shown in figure (a), m(t) is a low-pass signal with bandwidth W Hz. The frequency response of the band-pass filter H(f) is shown in figure (b). If it is desired that the output signal z(t) = 10x(t), the maximum value of W (in Hz) should be strictly less than ____________________. GATE ECE 2015 Set 1 Communications - Analog Communication Systems Question 5 English
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2
GATE ECE 2012
MCQ (Single Correct Answer)
+2
-0.6
The signal m(t) as shown is applied both to a phase modulator (with kp as the phase constant) and a frequency modulator (with kf as the frequency constant) having the same carrier frequency. GATE ECE 2012 Communications - Analog Communication Systems Question 6 English

The ratio kp/kf (in rad/Hz) for the same maximum phase deviation is

A
$$8\mathrm\pi$$
B
$$4\mathrm\pi$$
C
$$2\mathrm\pi$$
D
$$\mathrm\pi$$
3
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
The signal $$\cos\;\omega_ct\;+\;0.5\;\cos\;\omega_mt\;s\mathrm{in}\;\omega_ct$$ is
A
FM only
B
AM only
C
both AM & FM
D
neither AM nor FM
4
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
A Hilbert transformer is a
A
non-linear system
B
non-causal system
C
time-varying system
D
low-pass system
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