Signal Processing Quiz

Which of the following is an example of a periodic signal?

• impulse

• Exponential decay

• Step function

• Sine wave

A signal is said to be even if:

• x(t) = x(-t)

• x(t) = -x(-t)

• x(t) = x(t+1)

• x(t) = x(t-1)

Energy signals have:

• Finite energy and zero power

• Infinite energy

• Finite power

• Both energy and power finite

Which signal is non-causal?

• x(t) = u(t)

• x(t) = u(-t)

• x(t) = δ(t)

• x(t) = 0 for t<0

Which of the following signals is used to represent an instantaneous event?

• Impulse

• Step

• Ramp

• Sine

Which of the following is a discontinuous signal?

• Ramp

• Unit step

• Sinusoidal

• Exponential

Time shifting means:

• Shifting signal along time axis

• Inverting amplitude

• Scaling time

• Adding noise

Time scaling with factor <1 causes:

• Inversion

• Compression

• Expansion

• Shifting

Amplitude scaling affects the:

• Height of signal

• Time duration

• Frequency

• Phase

Orthogonal functions have:

• Zero inner product

• Same magnitude

• Same phase

• Non-zero inner product