Chemical Engineering - Process Control and Instrumentation

31. 

Which of the following measurements can be made by the measurement of emf ?

A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
D. All (a), (b) & (c)

Answer: Option D

Explanation:

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32. 

A magnetic flowmeter is

A. based on the principle of Faraday's law.
B. capable of measuring the flow rate of slurries and electrolytes.
C. based on the linear relationship between the fluid flow rate and the induced voltage.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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33. 

Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

A. oxygen in
B. carbon dioxide in
C. carbon monoxide in
D. temperature of

Answer: Option A

Explanation:

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34. 

Strain gage pressure transducers are used to measure __________ pressures.

A. gage as well as vacuum
B. absolute as well as differential
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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35. 

The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.)

A. Kc(1 + τis + τD ). s
B.
C.
D.

Answer: Option B

Explanation:

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