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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 9
46.
For a lossless transmission line, the propagation constant is given as γ = __________ .
jω LC
jω
jω
Answer: Option
Explanation:

For lossless line, a = 0, R = 0 and G = 0

∴

47.
Consider the pulse shape s(t) as shown. The impulse response h(t) of the filter matched to this pulse is
Answer: Option
Explanation:

h(t) = s(T - t).

48.
If each stage has a gain of 10 dB and noise figure of 10 dB, then the overall noise figure of a two stage cascade amplifier will be
10
1.09
1.0
10.9
Answer: Option
Explanation:

Overall noise figure F of the system is

F = F1 +

F1 = F2 = 10 dB = 10 in absolute units

g = 10 dB = 10 in absolute units

∴ F = 10 + = 10.9 .

49.
A rectangular waveguide of internal dimensions (a = 4 cm and b = 3) is to be operated in TE11 mode. The minimum operating frequency is
6.25 GHz
6.0 GHz
5.0 GHz
3.75 GHz
Answer: Option
Explanation:

.

50.
Using 4-bit numbers (n = 4) if k = 00112, how is k expressed in 2's complement?
10112
11012
11002
01012
Answer: Option
Explanation:

In 2's complement k + 11012 = 2n = 16

So -k is represented by 11012 .

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