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SIGNAL & SYSTEM

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

 1. 

The period of signal signal_files/i0020000.jpg is
a.
1/30 s
b.
60signal_files/i0020001.jpgs
c.
1/60signal_files/i0020002.jpg
d.
Not periodic
 

 2. 

Consider the following signals:
signal_files/i0030000.jpg
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)= esignal_files/i0040000.jpgu(t) is a
a.
power signal with Psignal_files/i0040001.jpg= signal_files/i0040002.jpg
c.
energy signal with Psignal_files/i0040003.jpg = signal_files/i0040004.jpg
b.
power signal with Psignal_files/i0040005.jpg = 0
d.
energy signal with Psignal_files/i0040006.jpg = 0
 

 4. 

The raised cosine pulse x(t) is defined as
x(t) = {signal_files/i0050000.jpg
0    , otherwise Tha totle energy of x(t) is
a.
signal_files/i0050001.jpg
b.
signal_files/i0050002.jpg
c.
signal_files/i0050003.jpg
d.
signal_files/i0050004.jpg
 

 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
a.
0
b.
1
c.
2
d.
3
 

 6. 

u[n]+u[-n] is equal to
a.
2
b.
1+signal_files/i0070000.jpg[n]
c.
2+signal_files/i0070001.jpg[n]
d.
1
 

 7. 

A discrireate time signal is given as below.
x[n] = cos (n/8)cos(signal_files/i0080000.jpgn/8)
a.
periodic with period 16signal_files/i0080001.jpg
c.
periodic with period 8
b.
periodic with period 16(signal_files/i0080002.jpg+1)
d.
not periodic
 

 8. 

The impulse response  of a continuous time LTI system is
h(t) = signal_files/i0090000.jpgu(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) = esignal_files/i0100000.jpgu(3-t). 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(t-2)]*u(t) is
a.
tu(t)+(2-t)u(t-2)
b.
(2-t)u(t)+tu(t-2)
c.
tu(t)+(t-2)u(t-2)
d.
(t-2)u(t)+tu(t-2)
 



 
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