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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 3
36.
In the given figure the input frequency f = 10(1/2 p RC)
0 dB
3 dB
-3 dB
-20 dB
Answer: Option
Explanation:

XC = 0.1R. Hence V0 = 0.1 Vi or = 0.1 or - 20 dB.

37.
For the second order system damping ratio is
0.1
0.25
0.333
0.5
Answer: Option
Explanation:

The standard form is s2 + 2ζωns + ω2n = 0.

38.
Modelling error may occur due to
neglecting the nonlinear characteristics of plant
inaccuracy of parameters
change of plant characteristics with time
any of the above
Answer: Option
Explanation:

Any of these may cause modelling error.

39.
In the given figure, P = 3 kg force. Then X(s) =
Answer: Option
Explanation:

If P = 3, . Hence .

40.
In Bode diagrams an octave is a frequency band from
ω1 to 10 ω1
ω1 to 8 ω1
ω1 to 4 ω1
ω1 to 2 ω1
Answer: Option
Explanation:

An octave is a frequency band from ω1 to 2ω1

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