# Signal Classification MCQ’s

This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Signal Classification”.

1. Determine the periodicity and also find whether it is a power or energy signal?
e(-at)u(t)
a) Periodic and energy signal
b) Non periodic and energy signal
c) Periodic and power signal
d) Periodic and energy signal

2. Find the fundamental period of 1+sin^2 (3π/5)n.
a) 10/3
b) 5
c) 3π/5
d) None of the mentioned

3. Discrete impulse signal is a power or energy signal?
a) Power signal
b) Energy signal
c) Both power and energy signal
d) Neither power or energy signal

4. Which of the given signals are periodic?
a) x(t) = 4 cos(5πt)
b) x(t) = u(t) – 1/2
c) x(t) = 4u(t) + 2sin(3t)
d) x[n] = 2sin(3n)

5. Which signal is called as energy signal?
a) Finite energy and zero power
b) Finite energy and non-zero power
c) Infinite energy and zero power
d) Infinite energy and non-zero power

6. Find the periodicity of the following signal. x(t)=cos((2π/7)t)sin((3π/5)t)
a) 30
b) 7
c) 35
d) 5/3

7. What is the period of a signal x(t)?
a) T
b) 2T
c) T/2
d) None of the mentioned

8. Which signal is said to be power signal?
a) Infinite power and zero energy
b) Infinite power and non-zero energy
c) Finite power and infinite energy
d) Finite power and zero energy

9. A unit impulse function has?
a) Large amplitude
b) Zero pulse width
c) Unity weight
d) All of the mentioned

10. Continuous Impulse signal is a power or energy signal?
a) Power signal
b) Energy signal
c) Both power and energy
d) Neither power nor energy signal

11. Check whether the signal is periodic or not?
x(t) = cos(4t) + 2sin(8t)
a) Periodic with period π/2
b) Periodic with period 2
c) Periodic with period 2/π
d) Not periodic 5 Star
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