Electronics and Communication Engineering - Exam Questions Papers

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?

A. -4 kHz to 4 kHz
B. -8 kHz to 8 kHz
C. every 4n kHz repeating
D. every ± 8 kHz and operating as well as at zero (k integer)

Answer: Option C

Explanation:

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17. 

Consider the equation s2 + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot?

A. -3.414
B. -2.414
C. -1.414
D. -0.414

Answer: Option A

Explanation:

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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:

A. 2.5
B. -2.5
C. 0.5
D. -0.5

Answer: Option B

Explanation:

Centroid

Poles are -2 and -3.


19. 

Value of 'K' for the system for which the system is stable:

A. K < 1
B. K > 1
C. K < 2
D. K > 2

Answer: Option C

Explanation:

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20. 

The number of roots of s3 + 2s2 + 7s + 3 = 0 in the left half of the s-plane is :

A. zero
B. one
C. two
D. three

Answer: Option D

Explanation:

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