Question 41 : Let x₁(t) and x₂(t) be periodic signals with fundamental periods T₁ and T₂ respectively. Then the fundamental period of x(t)=x₁(t)+x₂(t) is:
1. LCM of T₁ and T₂
2. HCF of T₁and T₂
3. Product of T₁ and T₂
4. Ratio of T₁ to T₂
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Question 42 : What is the period of cos2t+sin3t?
1. pi
2. 2*pi
3. 3*pi
4. 4*pi
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Question 43 : If x(n)=(0,0,1,1,1,1,1,0) then x(3n+1) is:
1. (0,1,0,0,0,0,0,0)
2. (0,0,1,1,1,1,0,0)
3. (1,1,0,0,0,0,0,0)
4. None of the mentioned
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Question 44 : Which of the following wave is known as “amplitude modulated wave” of x(t)?
1. C.x(t) (where C is a constant)
2. x(t)+y(t)
3. x(t).y(t)
4. dx(t)/dt
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Question 45 : What is output signal when a signal x(t)=cos(2*pi*40*t) is sampled with a sampling frequency of 20Hz?
1. cos(pi*n)
2. cos(2*pi*n)
3. cos(4*pi*n)
4. cos(8*pi*n)
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Question 46 : The relation between analog frequency 'F' and digital frequency 'f' is:
1. F=f*T(where T is sampling period)
2. f=F*T
3. No relation
4. None of the mentioned
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Question 47 : The even part of a signal x(t) is:
1. x(t)+x(-t)
2. x(t)-x(-t)
3. (1/2)*(x(t)+x(-t))
4. (1/2)*(x(t)-x(-t))
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Question 48 : Which bit coder is required to code a signal with 16 levels?
1. 8 bit
2. 4 bit
3. 2 bit
4. 1 bit
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Question 49 : If x(n)=(0,0,1,2,3,4,0,0) then x(n-2) is:
1. (0,0,2,4,6,8,0,0)
2. (0,0,1,2,3,4,0,0)
3. (1,2,3,4,0,0,0,0)
4. (0,0,0,0,1,2,3,4)
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Question 50 : Which property does y(t)=x(1-t) exhibit?
1. Time scaling
2. Time shifting
3. Reflecting
4. Time shifting and reflecting
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