process-control-and-instrumentation chemical-engineering question and answers -Page 27

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Process Control and Instrumentation problems

1. "An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a
Options
A. pH meter
B. polarimeter
C. chromatograph
D. polarograph

3. Platinum resistance thermometer can be used upto antimony point which is __________ �C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.
Options
A. 961.93
B. 630.74
C. 1064.43
D. 1261.93

4. Block diagram of a simple standard control system is shown below in the figure.

Which of the following statement about the above control system is wrong?
Options
A. The transfer functions of the measuring element and the process is represent by H and G₂ respectively
B. The overall transfer function for the change in load (X = 0) is given by
C. The overall transfer function for the change in set point (X₁ = 0) is given by
D. Manipulated variable is represented by C.

6. Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
Options
A. air to open valve with the controller direct acting.
B. air to close valve with the controller indirect acting.
C. air to open valve with the controller indirect acting.
D. air to close valve with the controller direct acting.

9. Which of the following thermocouples is capable of measuring a temperature of -50�C?
Options
A. Platinum - platinum + rhodium
B. Chromel - alumel
C. Iron-constantan
D. Copper - constantan

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