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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
21.
For the second order system having following differential equation

(When θ0 and θi are output and input) the natural frequency is
KJ
Answer: Option
Explanation:

Compare with standard form.

22.
For a second order system, the position of poles is in the shaded region shown in the given figure. The variation in damping factor is
from 0 to 1
from about 0.3 to 0.7
from 1 to 5
from 0 to 3
Answer: Option
Explanation:

Variation in damping factor is small.

23.
For a factor in the transfer function, the log magnitude plot
is a straight line with slope 0 dB/decade
is a straight line with slope 20 dB/decade
is a straight line with slope - 20 dB/decade
is a straight line with slope - 40 dB/decade
Answer: Option
Explanation:

jω term in denominator gives a straight line with a slope of - 20 dB/decade and gives a straight line with a slope of - 40 dB/decade.

24.
The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
True
False
Answer: Option
Explanation:

It is not critical frequency.

25.
The transfer function has the characteristics of high pass filter.
True
False
Answer: Option
Explanation:

When ω is high, the output is low.

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