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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 4
36.
The given figure shows three Nyquist plots of G(s) H(s) = e-sT/[s(s + 1)] for different values of T. The curves 1, 2, 3 can be
for T = 0, 0.5 and 1 respectively
for T = 1, 0.5 and 0 respectively
for T = 0.5, 1 and 0 respectively
for T = 0, 1 and 0.5 respectively
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Consider the following statements:
The gain margin and phase margin of an unstable system may respectively be
  1. positive, positive
  2. positive, negative
  3. negative, positive
  4. negative, negative
Of these statements
1, 4 are correct
1 and 2 correct
1, 2, 3 are correct
2, 3, 4 are correct
Answer: Option
Explanation:

For stable system both must be positive.

38.
A first order element yields almost exact duplication only for constant or slowly varying phenomenon.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
For a stable system
both phase and gain margin are negative
both phase and gain margin are positive
phase margin is positive but gain margin is negative
gain margin is positive but phase margin is negative
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
If the angle of departure of root locus at s = - 1 + j is
zero
90°
-90°
-180°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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