Exercise :: Signals and Systems  Section 1
 Signals and Systems  Section 1
 Signals and Systems  Section 2
 Signals and Systems  Section 3
 Signals and Systems  Section 4
 Signals and Systems  Section 5
 Signals and Systems  Section 6
 Signals and Systems  Section 7
 Signals and Systems  Section 8
 Signals and Systems  Section 9
 Signals and Systems  Section 10
7.  A voltage V(t) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt^{2}. If it is measured by a dc meter. The reading will be 

Answer: Option A Explanation: DC meter reads mean value. 
8.  A first order system will never be able to give a __________ response


Answer: Option C Explanation: Because to design band pass or band stop, transfer function of must be second order. 
9.  In the given figure the ratio T/d is the duty factor. 

Answer: Option B Explanation: . 
10.  If £[f(t)] = F(s), then £[f(t  T)] = 

Answer: Option B Explanation: A linear system is one in which the relationship between input and output is linear. All linear system possess the property of superposition i.e., if input u_{1} gives output y_{1} and input u_{2} gives output y_{2} then input u_{1} + u_{2} will give output y_{1} + y_{2}. Superposition implies homogencity i.e., if input u gives output y, then input ku gives output ky where k is a rational number. In general a system is linear if a transformation T satisfies the relation T(au_{1} + βu_{2}) = aT(u_{1}) + βT(u_{2}) where a and β are constant. 