Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

The given figure shows a pole zero diagram. The transfer function G(j1) is
A:
0.5 ∠0
B:
2.7 ∠- 31°
C:
2 ∠45°
D:
2 ∠- 67.4°
Answer: A

Join j1 point with the zero and poles. Find magnitude and phase angles of all these lines.

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The system in the given figure, has
A:
good gain and phase margin
B:
poor gain and phase margin
C:
good gain margin but poor phase margin
D:
poor gain margin but good phase margin
Answer: D

Since the plot is very near (-1 + j0) point, gain margin is poor.

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For the circuit in the given figure, V2(s)/V1(s) =
A:
B:
C:
D:
Answer: B

.

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In the given figure, if R = XC, voltage gain is
A:
0 dB
B:
3 dB
C:
-3 dB
D:
20 dB
Answer: C

If R = XC, V0 = 0.5 Vi Hence gain is -3 dB.

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For the system in the given figure,
A:
B:
C:
D:
none of the above
Answer: B

For inner loop we have transfer function =

Then = .

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