Question 11 : Whether the system described by the input-output equations y(n)=x(n)-x(n-1) a Time-variant system?
1. True
2. False
3.
4.
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Question 12 : Determine the impulse response for the cascade of two LTI systems having impulse responses h1(n)=(1/2)² u(n) and h2(n)= (1/4)² u(n).
1. (1/2)ⁿ[2-(1/2)ⁿ], n<0
2. (1/2)ⁿ[2-(1/2)ⁿ], n>0
3. (1/2)ⁿ[2+(1/2)ⁿ], n<0
4. (1/2)ⁿ[2+(1/2)ⁿ], n>0
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Question 13 : The system described by the input-output equations y(n)=x²(n) is a Non-linear system.
1. True
2. False
3.
4.
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Question 14 : The system described by the equation y(n)=ay(n-1)+b x(n) is a recursive system.
1. True
2. False
3.
4.
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Question 15 : The function given by the equation x(n)=1, for n=0;=0, for n≠0 is a:
1. Step function
2. Ramp function
3. Triangular function
4. Impulse function
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Question 16 : The output signal when a signal x(n)=(0,1,2,3) is processed through an 'Identical' system is:
1. (3,2,1,0)
2. (1,2,3,0)
3. (0,1,2,3)
4. None of the mentioned
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Question 17 : 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:Multiplicaton with x(k)
Step-3:Shifting
Step-4:Summation
1. 1-2-3-4
2. 1-2-4-3
3. 2-1-3-4
4. 1-3-2-4
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Question 18 : x(n)*δ(n-k)=?
1. x(n)
2. x(k)
3. x(k)*δ(n-k)
4. x(k)*δ(k)
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Question 19 : An LTI system is said to be causal if and only if
1. Impulse response is non-zero for positive values of n
2. Impulse response is zero for positive values of n
3. Impulse response is non-zero for negative values of n
4. Impulse response is zero for negative values of n
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Question 20 : The discrete time function defined as u(n)=n for n≥0;=0 for n<0 is an:
1. Unit sample signal
2. Unit step signal
3. Unit ramp signal
4. None of the mentioned
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