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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 3
11.
The circuit is shown in figure.

The current transfer ratio , is
Answer: Option
Explanation:

.

12.
Let f(A, B) = A ⊕ B; then the simplified form of the function f(f(x ⊕ y, z)w) is
(x ⊕ y ⊕ z)w
x ⊕ y ⊕ z ⊕ w
(x ⊕ y ⊕ z) + w
none of these
Answer: Option
Explanation:

f(A, B) = A ⊕ B

f(x ⊕ y, z) = (x ⊕ y ⊕ z) = 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
-200 dB/decade
-240 dB/decade
-280 dB/decade
-320 dB/decade
Answer: Option
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
2
3
5
does not exist
Answer: Option
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 __________
0 V, 58.82 Ω
0 V, 96.774 Ω
0 V, 3 KΩ
None of these
Answer: Option
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

∴ .

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