Explore topic-wise MCQs in Digital Signal Processing.

This section includes 31 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Signal Processing knowledge and support exam preparation. Choose a topic below to get started.

1.

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
Answer» E.
Discussion
2.

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
Answer» C. r>1
Discussion
3.

Time scaling operation is also known as ___________

A. Down-sampling
B. Up-sampling
C. Sampling
D. None of the mentioned
Answer» B. Up-sampling
Discussion
4.

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))
Answer» E.
Discussion
5.

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
Answer» C. x(n)=-x(n)
Discussion
6.

The signal given by the equation \(\sum_{n=-{\infty}}^{\infty}|x(n)|^2\) is known as __________

A. Energy signal
B. Power signal
C. Work done signal
D. None of the mentioned
Answer» B. Power signal
Discussion
7.

The phase function of a discrete time signal x(n)=an, where a=r.ejθ is?

A. tan(nθ)
B. nθ
C. tan-1(nθ)
D. none of the mentioned
Answer» C. tan-1(nθ)
Discussion
8.

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
Answer» D. None of the mentioned
Discussion
9.

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

A. Zero
B. Positive
C. Negative
D. Not defined
Answer» E.
Discussion
10.

THE_FUNCTION_GIVEN_BY_THE_EQUATION_X(N)=1,_FOR_N=0;=0,_FOR_N‚ÄÖ√Ñ√∂‚ÀÖ¬¢‚ÄÖ√тĆ0_IS_A:?$#

A. Step function
B. Ramp function
C. Triangular function
D. Impulse function
Answer» E.
Discussion
11.

WE_DEFINE_Y[N]_=_NX[N]_‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬®_(N-1)X[N]._NOW,_Z[N]_=_Z[N-1]_+_Y[N],_IS_Z[N]_STABLE??$#

A. Yes
B. No
Answer» B. No
Discussion
12.

WHAT_IS_THE_CONDITION_FOR_A_SIGNAL_X(N)=BRN_WHERE_R=E‚ÂÀ√≠¬¨¬±T_TO_BE_CALLED_AS_AN_DECAYING_EXPONENTIAL_SIGNAL??$#

A. 0<r<‚àû
B. 0<r<1
C. r>1
D. r<0
Answer» C. r>1
Discussion
13.

Discrete-time signals are _________________$

A. Continuous in amplitude and continuous in time
B. Continuous in amplitude and discrete in time
C. Discrete in amplitude and discrete in time
D. Discrete in amplitude and continuous in time
Answer» C. Discrete in amplitude and discrete in time
Discussion
14.

We_define_y[n]_=_nx[n]_–_(n-1)x[n]._Now,_z[n]_=_z[n-1]_+_y[n]._Is_z[n]_a_causal_system?$#

A. No
B. Yes
Answer» C.
Discussion
15.

Determine the product of two signals: x1 (n) = {2,1,1.5,3}; x2 (n) = { 1,1.5,0,2}.

A. {2,1.5,0,6}
B. {2,1.5,6,0}
C. {2,0,1.5,6}
D. {2,1.5,0,3}
Answer» B. {2,1.5,6,0}
Discussion
16.

Determine the value of the summation: ∑∞n= -∞ δ(n+3)(n2+n).$

A. 3
B. 6
C. 9
D. 12
Answer» C. 9
Discussion
17.

Determine the value of the summation: ∑∞n= -∞δ(n-1)sin2n.$

A. 1
B. 0
C. sin2
D. sin4
Answer» D. sin4
Discussion
18.

Determine the discrete-time signal: x(n)=1 for n‚â•0 and x(n)=0 for n<0$

A. Unit ramp sequence
B. Unit impulse sequence
C. Exponential sequence
D. Unit step sequence
Answer» E.
Discussion
19.

If n tends to infinity, is the accumulator function a stable one?

A. The function is marginally stable
B. The function is stable
C. The function is unstable
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
20.

Time scaling operation is also known as?

A. Down-sampling
B. Up-sampling
C. Sampling
D. None of the mentioned
Answer» B. Up-sampling
Discussion
21.

Is the function y[n] = y[n-1] + x[n] stable in nature?

A. It is stable
B. It is unstable
C. Both stable and unstable
D. None of the mentioned
Answer» B. It is unstable
Discussion
22.

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))
Answer» E.
Discussion
23.

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
Answer» C. x(n)=-x(n)
Discussion
24.

Is the function y[n] = x[n-1] – x[n-4] memoryless?$

A. True
B. False
Answer» C.
Discussion
25.

x(n)*δ(n-k)=?$

A. x(n)
B. x(k)
C. x(k)*δ(n-k)
D. x(k)*δ(k)
Answer» D. x(k)*‚âà√≠¬¨‚Ä¢(k)
Discussion
26.

Is the above function defined, causal in nature?

A. True
B. False
Answer» B. False
Discussion
27.

What is the nature of the following function: y[n] = y[n-1] + x[n]?

A. Integrator
B. Differentiator
C. Subtractor
D. Accumulator
Answer» E.
Discussion
28.

The phase function of a discrete time signal x(n)=an, where a=r.ejθ is:$

A. tan(nθ)
B. nθ
C. tan<sup>-1</sup>(nθ)
D. None of the mentioned
Answer» C. tan<sup>-1</sup>(n‚âà√≠‚Äö√†√®)
Discussion
29.

What is the time period of the function x[n] = exp(jwn)?

A. pi/2w
B. pi/w
C. 2pi/w
D. 4pi/w
Answer» D. 4pi/w
Discussion
30.

The discrete time function defined as u(n)=n for n‚â•0;=0 for n<0 is an:$

A. Unit sample signal
B. Unit step signal
C. Unit ramp signal
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
31.

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

A. Zero
B. Positive
C. Negative
D. Not defined
Answer» E.
Discussion