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Energy & Power Signals MCQs

Practice Energy & Power Signals MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Signals & SystemsEnergy & Power Signals

A finite-energy signal has energy E that is?

  • AFinite and nonzero, with zero average power
  • BInfinite with finite average power
  • CAlways equal to one
  • DZero for every nonzero signal
Report an error
Correct Answer: A. Finite and nonzero, with zero average power
Explanation: For the usual energy/power classification, an energy signal has 0<E<infinity and average power equal to zero.
Reference: Standard signals and systems: energy & power signals
Question 2
Signals & SystemsEnergy & Power Signals

A nonzero periodic signal with finite average power is generally classified as a?

  • APower signal
  • BEnergy signal with finite nonzero energy
  • CNeither under all conditions
  • DImpulse only
Report an error
Correct Answer: A. Power signal
Explanation: A typical nonzero periodic signal has infinite total energy but finite nonzero average power, so it is a power signal.
Reference: Standard signals and systems: energy & power signals
Question 3
Signals & SystemsEnergy & Power Signals

The total energy of x(t)=e^(-t)u(t) is?

  • A1/4
  • B1/2
  • C1
  • D2
Report an error
Correct Answer: B. 1/2
Explanation: E=∫0^infinity |e^-t|^2 dt=∫0^infinity e^-2t dt=1/2.
Reference: Standard signals and systems: energy & power signals