EXP 1,2,3 Quiz

Which statement best describes a discrete-time signal?

• It is defined for every instant in time without gaps.

• It is defined only at specific points in time, like every minute or year.

• It measures space only, not time.

• It is always a sinusoidal wave.

In MATLAB, which function should you use to show discrete-time sequences like the unit step or ramp?

• plot

• stem

• bar

• line

Which signal has the value 1 when n equals n0 and 0 otherwise?

• Unit step sequence

• Unit ramp sequence

• Unit sample (impulse) sequence

• Sinusoidal sequence

Which of these is a continuous-time periodic signal shown in the outputs of the experiment?

• Sine wave

• Random noise

• Bar chart

• Static line

In MATLAB, which function was used to draw the signals on the screen in this experiment?

• plot

• print

• read

• save

If you delay a sine wave by 5 seconds as suggested in the discussion, what happens to the wave?

• It shifts to the right along the time axis

• It gets taller

• It changes into a square wave

• It disappears

Which operation adds two discrete-time signals sample by sample?

• Signal folding

• Signal multiplication

• Signal addition

• Signal shifting

If y(n) = x(n − k), what does changing k do to the signal x(n)?

• It flips the signal around n = 0

• It shifts the signal by k samples

• It multiplies the signal by k

• It adds k to each sample value

Which statement best describes an even signal xe(n)?

• xe(n) = -xe(n)

• xe(-n) = xe(n)

• xe(-n) = -xe(n)

• xe(n) = xo(n)

A signal x(n) can be split into two parts. Which formula correctly shows this decomposition?

• x(n) = xe(n) − xo(n)

• x(n) = xe(n) + xo(n)

• x(n) = 2·xe(n)

• x(n) = 0.5·xo(n)