Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Bode magnitude plot is drawn between
A:
magnitude of network function and Ο‰
B:
dB magnitude and log Ο‰
C:
dB magnitude and Ο‰
D:
loge (magnitude) and log Ο‰
Answer: B

Frequency is plotted on log scale and magnitude is taken in dB.

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For the control system in the given figure, the value of K for critical damping is
A:
1
B:
5.125
C:
6.831
D:
10
Answer: B

since ΞΆ = 1, Ο‰n = 3.5 Hence 2 + 2k = 3.52 = 12.25 or K = 5.125 .

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For the given figure,
A:
B:
C:
D:
Answer: B

For the inner loop, transfer function =

Then .

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A negative feedback system has . The closed loop system is stable for
A:
K > 20
B:
15 < K < 19
C:
8 ≀ K ≀ 14
D:
K < 6
Answer: D

Find characteristic equation.

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In the given figure x6 =
A:
de(ax1 + bx2 + cx3)
B:
(a + b + c) (x1 + x2 + x3) (d + e)
C:
(ax1 + bx2 + cx3) (d + e)
D:
a b c d e (x1 + x2 + x3)
Answer: A

The input x1 is multiplied by a, x2, by b and x3 by c. The sum total is multiplied by d and e.

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