Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that
A:
a double pole is present
B:
a pair of complex conjugate poles is present
C:
either a double pole or a pair of complex conjugate poles is present
D:
either a pole or zero at that frequency is present
Answer: A
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For the system shown in the given figure the time response to unit step input is
A:
B:
c(t) = T(1 - e-t/T)
C:
c(t) = 1 - e-t/T
D:
c(t) = T e-t/T
Answer: C
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Assertion (A): When a PID controller is added to a system, the peak overshoot to step input cannot be determined easily.

Reason (R): Use of PID controller introduces a zero in the forward path.

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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Assertion (A): Derivative control action is also called rate control and has an anticipatory character.

Reason (R): Derivative control amplifies noise signals.

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: B
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The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from jω axis equal to
A:
sin θ
B:
cos θ
C:
tan θ
D:
cot θ
Answer: A
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