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Chemical Engineering - Process Control and Instrumentation

Exercise : Process Control and Instrumentation - Section 4
1.
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is
5π/12
π/6
π/12
π/3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Which of the following does not figure in the list of seven substances selected for international temperature scale ?
Ice (F.P) and steam (B.P)
Oxygen and sulphur (B.P)
Antimony and silver (F.P)
Zinc (B.P) and mercury (F.P)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
helium
hydrogen
nitrogen
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
pH meter has
one cell
two cells
three cells
no cell
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Routh test
criterion provides information about the actual location of roots.
cannot be used to test the stability of a control system containing transportation lag.
criterion is not applicable to systems with polynomial characteristic equation.
can not determine as to how many roots of the characteristics equation have positive real roots.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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