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Digital Signal Processing Mcqs

Q:

What is the ROC of the system function H(z) if the discrete time LTI system is BIBO stable?

A) Entire z-plane, except at z=0 B) Entire z-plane, except at z=?
C) Contain unit circle D) None of the mentioned
 
Answer & Explanation Answer: C) Contain unit circle

Explanation: Not available for this question

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311
Q:

Which of the following is true regarding the number of computations requires to compute an N-point DFT?

A) N² complex multiplications and N(N-1) complex additions B) N² complex additions and N(N-1) complex multiplications
C) N² complex multiplications and N(N+1) complex additions D) N² complex additions and N(N+1) complex multiplications
 
Answer & Explanation Answer: A) N² complex multiplications and N(N-1) complex additions

Explanation: Not available for this question

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302
Q:

What is the ROC of the signal x(n)=?(n-k), k>0?

A) z=0 B) z=?
C) Entire z-plane, except at z=0 D) Entire z-plane, except at z=?
 
Answer & Explanation Answer: C) Entire z-plane, except at z=0

Explanation: Not available for this question

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288
Q:

If a signal x(n) is passed through a system to get an output signal of y(n)=x(n+1), then the signal is said to be ____________

A) Delayed B) Advanced
C) No operation D) None of the mentioned
 
Answer & Explanation Answer: D) None of the mentioned

Explanation: For example, the value of the output at the time n=0 is y(0)=x(1), that is the system is advanced by one unit.

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284
Q:

The frequency ?P is called as ______________

A) Pass band ripple B) Stop band ripple
C) Pass band edge ripple D) Stop band edge ripple
 
Answer & Explanation Answer: C) Pass band edge ripple

Explanation: Pass band edge ripple is the frequency at which the pass band starts transiting to the stop band.

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283
Q:

What is the order of the four operations that are needed to be done on h(k) in order to convolute x(k) and h(k)?
Step-1:Folding
Step-2:Multiplication with x(k)
Step-3:Shifting
Step-4:Summation

A) 1-2-3-4 B) 1-2-4-3
C) 2-1-3-4 D) 1-3-2-4
 
Answer & Explanation Answer: D) 1-3-2-4

Explanation: First the signal h(k) is folded to get h(-k). Then it is shifted by n to get h(n-k). Then it is multiplied by x(k) and then summed over -? to ?.

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275
Q:

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 & Explanation Answer: D) Not defined

Explanation: For a discrete time signal, the value of x(n) exists only at integral values of n. So, for a non- integer value of ‘n’ the value of x(n) does not exist.

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262
Q:

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 & Explanation Answer: C) Unit ramp signal

Explanation: When we plot the graph for the given function, we get a straight line passing through origin with a unit positive slope. So, the function is called a unit ramp signal.

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