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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 2
31.
For quadratic factor. In Bode log magnitude plot the high frequency asymptote is a straight line having the slope
-20 dB per decade
+20 dB per decade
-40 dB per decade
+40 dB per decade
Answer: Option
Explanation:

For quadratic factor in denominator, slope at high frequencies is - 40 dB/decade.

32.
For op-amp circuit of the given figure, Eo(s)/Ei(s) =
Answer: Option
Explanation:

.

33.

Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
R is correct but A is wrong
Answer: Option
Explanation:

More bandwidth means more noise.

34.
In liquid flow system the capacitance of a water tank is defined as
none of the above
Answer: Option
Explanation:

Electrical and dQ is analogous to change in amount of liquid and dv is analogous to change in head.

35.
For a first order system having transfer function , the unit ramp response is
T(1 - e-t/T)
t - T + T e-t/T
t + T + T e-t/T
t + 2T e-t/T
Answer: Option
Explanation:

.

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