# Discrete-Time Signals MCQ’s

This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on ” Discrete Time Signals”.

1. The signal given by the equation ∑∞n=−∞|x(n)|2 is known as __________

a) Energy signal

b) Power signal

c) Work done signal

d) None of the mentioned

2. The phase function of a discrete time signal x(n)=a^{n}, where a=r.e^{jθ} is?

a) tan(nθ)

b) nθ

c) tan^{-1}(nθ)

d) none of the mentioned

3. If x(n) is a discrete-time signal, then the value of x(n) at a non-integer value of ‘n’ is?

a) Zero

b) Positive

c) Negative

d) Not defined

4. What is the condition for a signal x(n)=Br^{n} where r=e^{αT} to be called as an decaying exponential signal?

a) 0<r<∞

b) 0<r<1

c) r>1

d) r<0

5. The odd 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))

6. x(n)*δ(n-k)=?

a) x(n)

b) x(k)

c) x(k)*δ(n-k)

d) x(k)*δ(k)

7. The function given by the equation x(n)=1, for n=0; x(n)=0, for n≠0 is a _____________

a) Step function

b) Ramp function

c) Triangular function

d) Impulse function

8. A real valued signal x(n) is called as anti-symmetric if ___________

a) x(n)=x(-n)

b) x(n)=-x(-n)

c) x(n)=-x(n)

d) none of the mentioned

9. The discrete time function defined as u(n)=n for n≥0;u(n)=0 for n<0 is an _____________

a) Unit sample signal

b) Unit step signal

c) Unit ramp signal

d) None of the mentioned

10. Time scaling operation is also known as ___________

a) Down-sampling

b) Up-sampling

c) Sampling

d) None of the mentioned

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