Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

For the system of the given figure |G(jω)| = 0 dB at ω =
A:
0
B:
1 rad/sec.
C:
∞
D:
2.38 rad/sec.
Answer: D
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Assertion (A): The closeness of G(jω) locus to (- 1 + j0) point can be used as a measured of margin of stability.

Reason (R): When the G(jω) locus comes close to encircling (- 1 + j0) point the system becomes oscillatory.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
R is correct but A is wrong
Answer: A
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For low frequencies such that , the log magnitude of factor is 0 dB.
A:
True
B:
False
C:
D:
Answer: A
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The open loop transfer function of a system is . If the frequency at the intersection of - 40 dB/decade line and 0 dB line is ω, then
A:
B:
C:
D:
Answer: B
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For Bode plot of (1 + jωT) has
A:
slope of 20 dB/decade and phase angle + tan-1 (ωT)
B:
slope of - 20 dB/decade and phase angle + tan-1 (ωT)
C:
slope of 20 dB/decade and phase angle - tan-1 (ωT)
D:
slope of - 40 dB/decade and phase angle - tan-1(ωT)
Answer: A
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