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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 9
41.
If the Nyquist plot encircles the (-1 + j0) point clockwise once or more number of times, the system is unstable.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
In an armature controlled dc motor let J be equivalent moment of inertia of motor and load, f0 be equivalent viscous friction coefficient of motor and load and θ be angular displacement of motor shaft. Then torque equation is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
Which dc servomotor requires strongest permanent magnet?
Slotted armature
Surface wound armature
Surface wound with stationary rotor
Either (a) or (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Nichols chart consists of
constant magnitude loci
constant phase angle loci
magnitude and phase angle loci in log-magnitude versus phase diagram
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
Consider the following statements about root locus
  1. The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion
  2. Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus
  3. The number of root locus branches terminating on infinity is always zero
Which of the above statements are correct?
1, 2 and 3
1 and 2 only
1 only
2 and 3 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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