# Signal Classification MCQ’s

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

1. x(t) or x(n) is defined to be an energy signal, if and only if the total energy content of the signal is a ___________

a) Finite quantity

b) Infinite

c) Zero

d) None of the mentioned

2. What is the period of cos2t+sin3t?

a) pi

b) 2*pi

c) 3*pi

d) 4*pi

3. The deflection voltage of an oscilloscope is a ‘deterministic’ signal.

a) True

b) False

4. The even part of a signal x(t) is?

a) x(t)+x(-t)

b) x(t)-x(-t)

c) (1/2)*(x(t)+x(-t))

d) (1/2)*(x(t)-x(-t))

5. Which of the following is done to convert a continuous-time signal into a discrete time signal?

a) Modulating

b) Sampling

c) Differentiating

d) Integrating

6. All energy signals will have an average power of ___________

a) Infinite

b) Zero

c) Positive

d) Cannot be calculated

7. Let x_{1}(t) and x_{2}(t) be periodic signals with fundamental periods T_{1} and T_{2} respectively. Then the fundamental period of x(t)=x_{1}(t)+x_{2}(t) is?

a) LCM of T_{1} and T_{2}

b) HCF of T_{1}and T_{2}

c) Product of T_{1} and T_{2}

d) Ratio of T_{1} to T_{2}

8. For a continuous time signal x(t) to be periodic with a period T, then x(t+mT) should be equal to ___________

a) x(-t)

b) x(mT)

c) x(mt)

d) x(t)

9. Which of the following is the odd component of the signal x(t)=e^{(jt)}?

a) cost

b) j*sint

c) j*cost

d) sint

10. Let x_{1}(t) and x_{2}(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x_{1}(t)+x_{2}(t) to be periodic?

a) T_{1}+T_{2}

b) T_{1}-T_{2}

c) T_{1}/T_{2}

d) T_{1}*T_{2}

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