1
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
Which of the following demodulator(s) can be used for demodulating the signal $$x(t)\;=\;5\left(1+2\;\cos200\mathrm{πt}\right)\cos\;20000\;\mathrm{πt}$$ .
A
Envelope demodulator
B
square law demodulator
C
synchronous demodulator
D
None of the above
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 1992
MCQ (Single Correct Answer)
+2
-0.6
The maximum power efficiency of an AM modulator is
A
25%
B
50%
C
75%
D
100%
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