Electronics and Communication Engineering - Exam Questions Papers
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6.
The transfer function Y(s)/R(s) of the system shown is


Answer: Option
Explanation:
Construct a signal flow graph
.
7.
A lossless transmission line with air dielectric is 6 m long. What is the line length at 30 MHz?
Answer: Option
Explanation:
V = 3 x 108 m/s for lossless line
∴
∴ Line length = = 0.6 wave length long.
8.
Given that F(s) is the one-sided Laplace transform of f(t), the Laplace transform of
f(t)dt is

Answer: Option
Explanation:
Since it is one-sided Laplace transform.
9.
The antenna current of an AM broad cast transmitter, modulated to a depth of 40% by an audio sine wave is 11 amperes. It increased to 12 ampere as a result of simultaneous modulation by another sine wave. The modulation index due to this second sine wave is :
Answer: Option
Explanation:
μ2 = 0.57057, μ12 + 0.16 = 0.57057
⇒ μ1 = 0.64 .
10.
Two D flip-flop as shown below are to be connected as a synchronous counter that goes through the following Q1Q0 sequence
00 → 01 → 11 → 10 → 00 → __________
The inputs D0 and D1 respectively should be connected as

00 → 01 → 11 → 10 → 00 → __________
The inputs D0 and D1 respectively should be connected as

Answer: Option
Explanation:
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