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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 15
16.
An audio signal is band limited to 4 kHz. It is sampled at 8 kHz. What will be the spectrum of the sampled signal?
-4 kHz to 4 kHz
-8 kHz to 8 kHz
every 4n kHz repeating
every ± 8 kHz and operating as well as at zero (k integer)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Consider the equation s2 + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot?
-3.414
-2.414
-1.414
-0.414
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The characteristic equation of a closed loop system is (s + 2) (s + 3) + K = 0. The centroid of the asymptotes in root locus is:
2.5
-2.5
0.5
-0.5
Answer: Option
Explanation:

Centroid

Poles are -2 and -3.

19.
Value of 'K' for the system for which the system is stable:
K < 1
K > 1
K < 2
K > 2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
The number of roots of s3 + 2s2 + 7s + 3 = 0 in the left half of the s-plane is :
zero
one
two
three
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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