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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 3
11.
The phase angle curve of G(jω) H(jω) can be drawn
by adding the phase angle curves of individual factors
by subtracting the phase angle curves of individual factors
by multiplying the phase angle curves of individual factors
by dividing the phase angle curves of individual factors
Answer: Option
Explanation:

When terms are multiplied, phase angles are added.

12.
The most commonly used devices for differencing and amplification, in control systems, are
BJT amplifiers
FET amplifiers
operational amplifiers
either (a) or (b)
Answer: Option
Explanation:

Op-amps are commonly used due to their several advantages.

13.
For the system in the given figure, the ratio C(s)/R(s) =
Answer: Option
Explanation:

Since positive feedback is used,

14.
In Bode method of stability analysis, the error curve is not symmetric about corner frequency.
True
False
Answer: Option
Explanation:

Error curve is symmetric.

15.
The transfer function can be for
lead compensator
lag compensator
both (a) and (b)
either (a) or (b)
Answer: Option
Explanation:

For a lag compensator β > 1

Therefore is less than .

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