Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

In log magnitude Bode diagram the slope of high frequency asymptote of (1 + jωT) is
A:
20 dB per decade
B:
10 dB per decade
C:
20 dB per octave
D:
10 dB per octave
Answer: A
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Assertion (A): The root locus of a control system is symmetrical about real axis.

Reason (R): For all polynomials with real coefficients, complex poles always occur in conjugate pairs.

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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A unity feedback system has . If input r(t) = 1 + 2t + t3, the steady error is
A:
zero
B:
0.4
C:
4
D:
infinity
Answer: D
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In a mechanical accelerometer, the steady state displacement is a measure of
A:
constant input acceleration
B:
constant input velocity
C:
either (a) or (b)
D:
neither (a) nor (b)
Answer: A
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The frequency at which phase angle is 180° is called
A:
phase crossover frequency
B:
stability limit frequency
C:
frequency of limited stability
D:
gain margin frequency
Answer: A
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