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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 10
16.
For the system in the given figure G varies slightly, the ratio of open loop sensitivity to closed loop sensitivity is
1 : (1 + GH)
1 : (1 + GH)-1
1 : (1 - GH)
1 : (1 - GH)-1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The M circle for M = 1 is the
straight line at x = - 0.5
critical point (-l, jo)
circle with r = 0.33
circle with r = 0.67
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Which of the following can act as error detecting devices
  1. a pair of potentiometers
  2. a pair of synchros
  3. a differential transformer
  4. a metadyne
  5. a control transformer
Select the answer using the following codes:
1, 2, 5
2, 3, 4, 5
1, 3, 4, 5
1, 2, 3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
The loop transfer function of a feedback system is . The number of asymptotes of its root loci are
1
2
3
4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.

Assertion (A): If minimum phase system has a gain margin of 8 dB and phase margin of 21°, the system is stable.

Reason (R): For a minimum phase system both GM and PM must be positive for the system to be stable.

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:
No answer description is available. Let's discuss.
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