1
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
In an FM system, a carrier of 100 MHz is modulated by a sinusoidal signal of 5
KHz. The bandwidth by Carson’s approximation is 1 MHz. If y(t) = (modulated
waveform)3, then by using Carson’s approximation, the bandwidth of y(t) around
300 MHz and the and the spacing of spectral components are, respectively.
2
GATE ECE 1993
Numerical
+2
-0
A superheterodyne radio receiver with an intermediate frequency of 455 KHz is
tuned to a station operating at 1200 KHz. The associated image frequency is
______ KHz.
Your input ____
3
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
Which of the following demodulator(s) can be used for demodulating the signal
$$x(t)\;=\;5\left(1+2\;\cos200\mathrm{πt}\right)\cos\;20000\;\mathrm{πt}$$ .
4
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
The maximum power efficiency of an AM modulator is
Questions Asked from Analog Communication Systems (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE ECE Subjects
Network Theory
Control Systems
Electronic Devices and VLSI
Analog Circuits
Digital Circuits
Microprocessors
Signals and Systems
Representation of Continuous Time Signal Fourier Series Discrete Time Signal Fourier Series Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Transmission of Signal Through Continuous Time LTI Systems Discrete Time Linear Time Invariant Systems Sampling Continuous Time Signal Laplace Transform Discrete Fourier Transform and Fast Fourier Transform Transmission of Signal Through Discrete Time Lti Systems Miscellaneous Fourier Transform
Communications
Electromagnetics
General Aptitude