Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

For the system of the given figure the transfer function =
A:
B:
C:
D:
Answer: B

, E0(s) = [I(s)][Z2(s)] or .

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Whether a linear system is stable or unstable that it
A:
is a property of the system only
B:
depends on the input function only
C:
both (a) and (b)
D:
either (a) or (b)
Answer: A

Stability is a property of the system only.

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For the system in the given figure. The transfer function C(s)/R(s) is
A:
G1 + G2 + 1
B:
G1 G2 + 1
C:
G1 G2 + G2 + 1
D:
G1 G2 + G1 + 1
Answer: C

Transfer function = (G1 + 1) G2 + 1 = G1 G2 + G2 + 1.

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Mechanical impedance is the ratio of
A:
rms force to rms velocity
B:
rms force to rms displacement
C:
rms velocity to rms displacement
D:
none of the above
Answer: A

In force voltage analogy force is analogous to voltage and velocity to current. Just as , force/velocity = mechanical impedance.

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For the system in the given figure the characteristic equation is
A:
B:
C:
K(s + 1)(s + 3) = 0
D:
s(s + 2) = 0
Answer: A

Transfer function = .

Hence characteristic equation is .

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