Electronics and Communication Engineering - Exam Questions Papers

11. 

The circuit is shown in figure.

The current transfer ratio , is

A.
B.
C.
D.

Answer: Option B

Explanation:

.


12. 

Let f(A, B) = A ⊕ B; then the simplified form of the function f(f(xy, z)w) is

A. (xyz)w
B. xyzw
C. (xyz) + w
D. none of these

Answer: Option D

Explanation:

f(A, B) = A ⊕ B

f(xy, z) = (xyz) = M

But f(MW) is undefined.


13. 

A system has 12 poles or 2 zeros. Its high frequency asymptote in its magnitude plot has slope of

A. -200 dB/decade
B. -240 dB/decade
C. -280 dB/decade
D. -320 dB/decade

Answer: Option A

Explanation:

High frequency asymptotes = - 20(12) + 2(20) = - 200 dB/DECADE.


14. 

(1 2 1)x = (1 0 0)4 Then x is equal to

A. 2
B. 3
C. 5
D. does not exist

Answer: Option B

Explanation:

x2 = 2x + 1 = 16

x2 + 2x - 15 = 0, (x - 3)(x + 5) = 0, x = 3, - 5

Thus x = 3.


15. 

For the network shown below, the Thevenin voltage and RTH is equal to __________

A. 0 V, 58.82 Ω
B. 0 V, 96.774 Ω
C. 0 V, 3 KΩ
D. None of these

Answer: Option A

Explanation:

Since there is no independent source in the network; VTH = 0. To find RTH apply 1 A current source across A and B.

Apply KCL at node Vx

as

Solving Vx = 58.82 V

.