Exercise: Automatic Control Systems
Questions for: Automatic Control Systems
For a factor 
in the transfer function, the log magnitude plot
in the transfer function, the log magnitude plot
Answer: D
jω term in denominator gives a straight line with a slope of - 20 dB/decade and 
gives a straight line with a slope of - 40 dB/decade.
For a second order system, the position of poles is in the shaded region shown in the given figure. The variation in damping factor is
Answer: B
Variation in damping factor is small.
For the second order system having following differential equation
(When θ0 and θi are output and input) the natural frequency is
(When θ0 and θi are output and input) the natural frequency is
A: 
B: 
C:
KJ
D: 
Answer: A
Compare with standard form.
A system with transfer function
may be approximated by the system
may be approximated by the system
A: 
B: 
C: 
D: 
Answer: A
Coefficient (s + 15) gives the term e-15t and the coefficient (s + 20) gives the term e-20t.
These can be neglected as compared to terms corresponding to s and (s + 1).
If phase angle of open loop transfer function becomes - 180° at frequency ω1, then gain margin is equal to
A:
|G(jω1)|
B: 
C:
1 + |G(jω1)|
D: 
Answer: B
If gain is a, gain margin is 
. In this case gain is |G(jω1)|.
Ad Slot (Above Pagination)
Discuss About this Question.