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GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
A sinusoid x(t) of unknown frequency is sampled by an impulse train of period 20 ms. The resulting sample train is next applied to an ideal lowpass filter with a cutoff at 25 Hz. The filter output is seen to be a sinusoid of frequency 20 Hz. This means that x(t) has a frequency of
A
10 Hz
B
60 Hz
C
30 Hz
D
90 Hz
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