"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is _______________ criterion?
Correct answer: C. Bode stability
- A. Routh stability
- B. Nyquist
- C. Bode stability
- D. None of these
Explanation
The Bode stability criterion checks the gain at the phase-crossover frequency: a gain greater than unity indicates instability for the usual negative-feedback case. Nyquist uses encirclements of the critical point rather than this direct amplitude comparison.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Process Control and Instrumentation
254 free Process Control and Instrumentation MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Process Control and Instrumentation questions
Working principle of mercury in glass thermometer is__________________?
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?
Which of the following cannot measure a temperature of 1600°C ?
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures ?
Maximum differential pressure in liquid manometer is ______________ psi?