Electronics and Communication Engineering - Exam Questions Papers
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1.
In the signal flow graph of figure below, the gain C/R will be :


Answer: Option
Explanation:
Forward path gain
P1 = 2 x 3 x 4 ⇒ 24, P2 = 5, D1 = 1
D2 = - 3, L1 = - 2, L2 = - 3, L3 = - 4
Two non touching loop = L1 x L3 = - 2 x - 4 = 8
But if we take loop L4 into consideration then = 5 x -1 x - 1 x - 1 = -5
.
2.
The resonant frequency of the circuit shown in figure is,


Answer: Option
Explanation:
Leq = L1 + L2 + 2M
Leq = 1 + 2 + 2 x = 4 H
∴ .
3.
A short grounded vertical antenna has a length L which is 0.05λ at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be
Answer: Option
Explanation:
Rr = 80p2
∴ Rr ∝ f2.
4.
Which of the following is a solution to the differential equation
?

Answer: Option
Explanation:
log x(t) = 3t
x(t) = K.e-3t
Thus option (B) satisfies the solution.
5.
In the circuit shown, the device connected to Y5 can have address in the range


Answer: Option
Explanation:
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