The Four-Channel FDM Link That Needed 95 kHz
Four 20 kHz channels looked like an 80 kHz job—until the guard bands were counted.
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FE Electrical & Computer · Communications
FE Communications Practice Questions
Solve FE-style Communications questions and learn the reasoning behind each answer through interactive engineering cases.
Interactive problems•Reasoning explained•Solutions included
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PRACTICE SET
FE Communications Practice Questions
Choose a question and solve it before reading the final engineering verdict.
QUESTION01
The Four-Channel FDM Link That Needed 95 kHz
Four 20 kHz channels looked like an 80 kHz job—until the guard bands were counted.
Solve →
QUESTION02
The PCM Link That Needed 64 kbps, Not 32
The voice channel bandwidth was 4 kHz. The data link was sized at 32 kbps and immediately overflowed.
Solve →
QUESTION03
The AM Signal Whose Envelope Pinched Shut
The carrier was 5 V. The message amplitude was 6 V. The envelope detector stopped reproducing the message cleanly.
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What should I practice in FE Communications?
Practice the calculations, assumptions, constraints, and failure modes that appear around this topic. Each question here is designed to test whether you can apply the concept when the obvious calculation is not the whole engineering decision.