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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 9
21.
For any transfer function, the constant phase angle loci are
a family of circles
a family of straight lines
either (a) or (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
For an m x n matrix A, the eigen values are the roots of the characteristic equation
|I - A|
|λI - A| = 0
|λA - I| = 0
|A - I| = 0
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In force current analogy, displacement x is analogous to
charge
magnetic flux linkage
electrostatic energy
voltage
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Consider the following statements about variable reluctance stepper motor used in control system
  1. The static torque acting on rotor is a function of angular misalignment between stator and rotor teeth
  2. There are two positions of zero torque i.e, . Q = 0 and where T is the number of rotor teeth
  3. Both zero torque positions are stable
  4. When stator is excited, rotor is pulled into minimum reluctance position
Of these statements, the correct ones are
2, 3, 4
1, 2, 3
1, 2, 4
1, 3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
For the system in the given figure, the gain margin is
0
low
+ ∞
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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