# 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)=an, where a=r.e 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)=Brn where r=eαT 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 5 Star
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