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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 8
21.
Consider the following statements about polar plots
  1. Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞
  2. Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90°
Of the above statements:
Both are correct
Both are wrong
1 is correct and 2 is wrong
2 is correct and 1 is wrong
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The relative stability of a system is given by
gain margin alone
phase margin alone
both phase and gain margins
either (a) or (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.

Assertion (A): Nyquist stability criterion uses the number of encirclements around (-1 + j0) point in GH plane to determine stability

Reason (R): The (-1 + j0) point in the s plane lies in the Nyquist path.

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.
24.
In a two phase servomotor the voltages applied to the two stator windings
are equal in magnitude and are in phase
are unequal in magnitude but are in phase
are equal in magnitude but have a phase difference of 90°
are unequal in magnitude and have a phase difference of 90°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The phase angle characteristic in the given figure is for
all pass function
transport lag
minimum phase function
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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