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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 3
41.
The polar plot in the given figure is for the term
jωT
1 + jωT
Answer: Option
Explanation:

For the term 1 + jωt, magnitude is 1 at ω = 0 and infinite at ω = ∞.

42.
The compensator in the given figure is a
lag compensator
lead compensator
lag-lead compensator
none of the above
Answer: Option
Explanation:

Obtain transfer function.

43.
If G(s) H(s) = , the closed loop poles are on
negative real axis
jω axis
right half plane
either (a) or (b)
Answer: Option
Explanation:

Poles are at s = ± j 10.

44.
For the block diagram of the given figure, the equation describing system dynamics is
(1 + RCs) Δθ0(s) = Δθi(s) + R Δ H(s)
(1 + RCs) [ΔH(s)] = Δθ(s) - Δθ0(s)
(1 + RCs) Δθ0(s) = RΔ H(s) - Δ θi(s)
(1 + RCs) Δθi(s) = Δ H(s)[R] - Δθ0(s)
Answer: Option
Explanation:

Total input is [ΔH (s)]R + [ΔQi (s)]. This input gets multiplied by to give AQ0(s).

45.
For the given figure C(s)/R(s)
K
0.5 K
2 K
0.25 K
Answer: Option
Explanation:

.

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