# Electronics and Communication Engineering - Exam Questions Papers

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41.

The Z-inverse of the given Z-transform is __________

Answer: Option

Explanation:

value of

*x(n)* = *d(n)* impulse response.

42.

Find the Fourier transform of the half cosine pulse as shown below :

Answer: Option

Explanation:

The given signal can be expressed as multiplication of *x _{1}*

*(t)*and

*x*

_{2}*(t)*as shown below.

where A = 2, T/2 = 0.25 => T = 0.5

**∴** *x(t)* = *x _{1}(t)* x

*x*

_{2}(t)=> X(*f*) = X_{1}*(f)* * X_{2}*(f)*

Now X_{1}*(f)* = [δ(*f - f _{0}*) + δ(

*f + f*)]

_{0}= [sin *c* [T(*f - f _{0}*)] + sin

*c*[T(

*f + f*)]]

_{0}

Now, A = 2, T = 0.5 and *f _{0}* = = 1

=> X(*f*) = 0.5[sin *c* (0.5(*f* - 1)) + sin *c* (0.5(*f* + 1))].

43.

The

*q*-*v*relation of a capacitor is*v*= 1 +*q*+*q**. Find the amount of energy required to charge this capacitor from*^{x}*q*(*t*_{0}) = 0 to*q*(*t*) = 5 C.Answer: Option

Explanation:

44.

V-I relationship of a network N is given by, V = 8 - 4I.

The equivalent circuit to the network N is shown below

The values of I

The equivalent circuit to the network N is shown below

The values of I

_{N}and R_{N}areAnswer: Option

Explanation:

Given equivalent circuit is Norton's equivalent circuit

V = 8 - 4I

Put V = 0I = I_{N} = 2 A

Put I = 0 V = V_{TH} = 8 V

.

45.

If the open-loop transfer function is a ratio of a numerator polynomial of degree '

*m*' and a denominator polynomial of degree '*n*', then the integer (*n*-*m*) represents the number of:Answer: Option

Explanation:

Asymptotes.

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