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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 5
6.
In a transmission line terminated with a load equal to the characteristic impedance, the reflection coefficient is
0
+1
-1
Infinity
Answer: Option
Explanation:

.

7.
Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be given by
1 : (1 + GH)
1 : (1 + GH)- 1
1 : (1 - GH)
1 : (1 - GH)- 1
Answer: Option
Explanation:

Open loop sensitivity = 1

Closed loop sensitivity =

Hence ratio = 1 : (1 + GH) - 1.

8.
Consider the signal S(t) shown below :

The slope of the matched filter output during the interval
8
12
16
18
Answer: Option
Explanation:

Match filter will be

The output of this will be convolution of S(t) with match filter.

.

9.
The logic function f(A B, C) = Σm(0, 2, 4, 5, 6) represented by
i
i, ii
i, iii
i, ii, iii
Answer: Option
Explanation:

10.
An electrical system and its signal-flow graph representation are shown in figure (a) and (b) respectively

The values of G2 and H, respectively are
Answer: Option
Explanation:

Vi(s) = Z1I1 + Z3(I1 - I2) ...(i)

V0(s) = Z4I2

I2(Z3 + Z2 + Z4) = Z3I1 ...(ii)

From signal flow graph

I2 = I1G2 ⇒

Hence,

...(iii)

From SFG ...(iv)

From (ii), (iii), (iv) we get H.

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