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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
16.
The transfer function can be for
lead compensator
lag compensator
lead-lag compensator
either (a) or (b)
Answer: Option
Explanation:

For a lead-lag compensator

β > 1 and a < 1.

17.
The system of the given figure
has two poles and one zero in left half plane
has two poles and one zero in right half plane
has two poles in left half plane and zero in right half plane
none of the above
Answer: Option
Explanation:

Since there are two poles at s = -2 and s = -1 and one zero at s = +3.

18.
For the given figure C(s)/R(s)
none of the above
Answer: Option
Explanation:

.

19.
If phase angle of open loop transfer function becomes - 180° at frequency ω1, then gain margin is equal to
|G(jω1)|
1 + |G(jω1)|
Answer: Option
Explanation:

If gain is a, gain margin is . In this case gain is |G(jω1)|.

20.
A system with transfer function

may be approximated by the system
Answer: Option
Explanation:

Coefficient (s + 15) gives the term e-15t and the coefficient (s + 20) gives the term e-20t.

These can be neglected as compared to terms corresponding to s and (s + 1).

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