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Chemical Engineering - Process Control and Instrumentation

Exercise : Process Control and Instrumentation - Section 5
1.
Time constant is the
time taken by the controlled variable to reach 63.2% of its full change.
same as transportation lag.
same as dead time.
time required by the measured variable to reach 63.2% of its ultimate change.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Mercury manometer (U-tube type) exemplifies a __________ order system.
zero
first
second
third
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
chromel-alumel
iron-constantan
platinum-rhodium
platinum-platinum+rhyodium
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Bode stability method uses __________ loop transfer function.
open
closed
either (a) or (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
Nickel
Brass
Chromel
Invar
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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