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Question

Which of the following statements are correct ?
1. All signals having infinite energy are power signals.
2. A finite amplitude periodic signal is a power signal.
3. A signal cannot be both energy and power signal.
4. Time scaling has no effect on signal energy.

A
2,3 and 4 only
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B
2 and 3 only
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C
1, 2 and 3
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D
1 and 4 only
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Solution

The correct option is B 2 and 3 only
There are signal having infinite energy have infinite power as well
e.g., x (t) = r(t)
Ex=
Px=
Hence neither an energy signal nor power signal
Time scaling does not affect power of signal, while energy of the signal is affected,
E(at)E(t)a

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