WorksheetsGroup B
Total questions: 10
Worksheet time: 5mins
Which statement best describes a continuous-time signal?
It is defined at every instant of time over a continuous input.
It is defined only at separate points like every minute or hour.
It can take only discrete values like 0 or 1.
It only represents images in space.
Which description best matches a delayed unit sample sequence with a delay of 15 samples?
The spike occurs at n = 0
The spike occurs at n = 15
The values increase linearly with n
The values oscillate smoothly
In the example, x1(n)=2x(n−5)−3x(n+4). Which operations are used to build x1(n) from x(n)?
Only folding
Only addition
Shifting and scaling, then addition
Multiplication by itself
For the task x(n)=n[u(n)−u(n−10)]+10e−0.3(n−10)[u(n−10)−u(n−20)], which function turns the first part on from n=0 to 9?
δ(n)
u(n)−u(n−10)
u(n−10)−u(n−20)
cos(0.04πn)
In x(n)=cos(0.04πn)+0.2w(n), what is w(n) described as?
A unit step
A Gaussian random sequence with zero mean and unit variance
A decaying exponential
A unit impulse
In the plot labeled Sequence in Example a, the values move from negative to positive as n increases. Which operation could create such behavior?
A constant zero signal
A sequence that steps up over time
A random signal with no mean
A single impulse only
Which formula correctly decomposes any real sequence x(n)?
x(n) = xe(n) − xo(n)
x(n) = xe(n) + xo(n)
x(n) = 2·xe(n)
x(n) = 2·xo(n)
How do you compute the odd part xo(n) from x(n)?
xo(n) = 0.5·[x(n) − x(−n)]
xo(n) = x(n) + x(−n)
xo(n) = 2·x(−n)
xo(n) = 0
If a signal is odd, what is true about its value at n = 0?
It must be 1
It must be −1
It must be 0
It can be any value
Why do we use fliplr(x) in the MATLAB code for even and odd parts?
To reverse the order to get x(−n)
To make the signal louder
To color the plot
To remove zeros from the signal
