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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 is
 a. 1/30 s b. 60 s 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)= e u(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
 a. b. c. d. 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+ [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) = e u(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)