1
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 5 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
$$\mathrm\pi$$
2
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
3
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
4
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
The diagonal clipping in Amplitude Demodulation (using envelope detector) can be avoided if RC time-constant of the envelope detector satisfies the following condition, (here W is message bandwidth and ωc is carrier frequency both in rad/sec)
A
$$\mathrm{RC}\;<\frac1{\mathrm W}$$
B
$$\mathrm{RC}\;>\frac1{\mathrm W}$$
C
$$\mathrm{RC}\;<\frac1{{\mathrm\omega}_\mathrm c}$$
D
$$\mathrm{RC}\;>\frac1{{\mathrm\omega}_\mathrm c}$$
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