Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.


1.

The
period of signal is a.  1/30 s  b.  60s  c.  1/60  d.  Not
periodic         


2.

Consider the following signals:
a.  x(t) and
y(t)  b.  y(t) and
z(t)  c.  x(t) and
z(t)  d.  All of
these         


3.

The
signal x(t)= eu(t) is a a.  power signal
with P=  c.  energy signal
with P =  b.  power signal
with P = 0  d.  energy signal with P =
0     


4.

The
raised cosine pulse x(t) is defined as
x(t) = {
0 , otherwise Tha totle energy of x(t) is


5.

The
trapezoidal pulse x(t) is applied to a differentiator, defined by y(t) = dx(t)/dt. The totle energy
of y(t) is


6.

u[n]+u[n] is equal to a.  2  b.  1+[n]  c.  2+[n]  d.  1         


7.

A
discrireate time signal is given as below.
x[n] = cos
(n/8)cos(n/8) a.  periodic with period 16  c.  periodic with
period 8  b.  periodic with period 16(+1)  d.  not
periodic     


8.

The
impulse response of a continuous time LTI system is
h(t) = u(t)
The system is a.  casual and stable  b.  casual but not stable  c.  Stable but not casual  d.  neither casual nor stable         


9.

The
impulse responce of a contonuous time LTI system is h(t) = eu(3t). The
system is a.  causal and
stable  b.  causal but not
stable  c.  stable but not
causal  d.  neither causal
nor stable         


10.

The
continuous time convolution integral y(t) = [u(t)u(t2)]*u(t) is a.  tu(t)+(2t)u(t2)  b.  (2t)u(t)+tu(t2)  c.  tu(t)+(t2)u(t2)  d.  (t2)u(t)+tu(t2)         
