1. Is the function y[n] = sin(x[n]) periodic or not?

a) True

b) False

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

a) pi/2w

b) pi/w

c) 2pi/w

d) 4pi/w

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

a) Integrator

b) Differentiator

c) Subtractor

d) Accumulator

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4. Is the above function defined, causal in nature?

a) True

b) False

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

a) True

b) False

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6. Is the function y[n] = x[n-1] – x[n-56] causal?

a) The system is non causal

b) The system is causal

c) Both causal and non causal

d) None of the mentioned

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7. 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

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8. 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

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9. We define y[n] = nx[n] – (n-1)x[n]. Now, z[n] = z[n-1] + y[n], is z[n] stable?

a) Yes

b) No

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10. 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

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1. Is the function y[n] = cos(x[n]) periodic or not?

a) True

b) False

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2. If n tends to infinity, is the accumulator function an unstable one?

a) The function is marginally stable

b) The function is unstable

c) The function is stable

d) None of the mentioned

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3. Comment on the causality of the following discrete time system: y[n] = x[-n].

a) Causal

b) Non causal

c) Both Casual and Non casual

d) None of the mentioned

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4. Comment on the causality of the discrete time system: y[n] = x[n+3].

a) Causal

b) Non Causal

c) Anti Causal

d) None of the mentioned

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5. Consider the system y[n] = 2x[n] + 5. Is the function linear?

a) Yes

b) No

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6. Comment on the time invariance of the following discrete system: y[n] = x[2n+4].

a) Time invariant

b) Time variant

c) Both Time variant and Time invariant

d) None of the mentioned

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7. Is the function y[2n] = x[2n] linear in nature?

a) Yes

b) No

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8. How is a linear function described as?

a) Zero in Finite out

b) Zero in infinite out

c) Zero in zero out

d) Zero in Negative out

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9. Is the system y[n] = x^{2}[n-2] linear?

a) Yes

b) No

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^{2}+ x2

^{2}is not equal to (x1 + x2)

^{2}.

10. Is the above system, i.e y[n] = x^{2}[n-2] time invariant?

a) Yes

b) No

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