IndiaBIX

Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 1
16.
First column elements of Routh's tabulation are 3, 5, , 2. It means that there
is one root in left half s plane
are two roots in left half s plane
are two roots in right half s plane
is one root in right half s plane
Answer: Option
Explanation:

Since there are two sign changes in the first column, hence two roots in right half plane.

17.
When a unit step voltage drives a lag network the output
remains constant at unit step value
increases exponentially from zero to final value
decreases exponentially from 1 to 0
either (b) of (c) depending on values of R and C
Answer: Option
Explanation:

At t = 0 the capacitor behaves as a short-circuit and output voltage is 0. At t = ∞ capacitor behaves as an open-circuit and V0 = Vi.

18.
For the given figure C(s)/R(s)
Answer: Option
Explanation:

.

19.
For the circuit in the given figure,
Answer: Option
Explanation:

.

20.
A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is
stable
unstable
limitedly stable
either (a) or (c)
Answer: Option
Explanation:

Poles on j x-axis lead to oscillations.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers