# Electronics and Communication Engineering - Exam Questions Papers

16.
Impedance function for the network shown below is:
(3s + 1)
2s + 3
Explanation:

17.
The function f = A ⊕ B ⊕ A ⊕ D ⊕ E ⊕ C ⊕ D ⊕ E ⊕ F ⊕ G ⊕ F ⊕ G ⊕ C ⊕ E ⊕ A ⊕ D ⊕ B ⊕ E ⊕ EB ⊕ B ⊕ B ⊕ B ⊕ D can be written as
A ⊕ B ⊕ D
A ⊕ B ⊕ E
A ⊕ E
AE
Explanation:

A A B B C D D E E F G

2 1 3 3 2 3 1 4 1 2 2

0 A B B 0 D D 0 E 0 0

f = A ⊕ B ⊕ B ⊕ D ⊕ DE

= A ⊕ 1 ⊕ 1 ⊕ E

= A ⊕ 0 ⊕ E = AE.

18.
Which of the following functions would have only odd powers of x in its Taylor series expansion about the point x = 0?
sin (x3)
sin (x2)
cos (x3)
cos (x2)
Explanation:

Thus sin(x3) will have odd powers

Sin (x2) will have even powers

Cos (x3) will have even powers

Cos (x2) will have even powers.

19.
Find the maximum power that can be delivered to a load
0.025 W
2.5 W
2.5 W
0.25 W
Explanation:

PL = I2R = x R â€¢â€¢â€¢(i)

where zS = 100 + j50

zL = 100 - j50

Putting the values in eq. (i)

PL =X l00 = 0.25 watts.

20.
For a integrator circuit, Ri = 100 KΩ, CF = 10 μF. The input is a step dc voltage as shown below. Its output will be