Process Instrumentation and Control - Interview Questions | Exam2Win

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86. Almost all pH measurements are best made with a:

A. glass electrode

B. solid state electrode

C. liquid ion exchange electrode

D. redox electrode

E. heterogeneous membrane electrode.

Explanation:

87. The Ringelmann chart is associated with measurement of:

A. smoke density

B. S02 and S03

C. NO,

D. CO

E. dust concentration.

Explanation:

88. Which is not correct statement about selection of tube material for a Bourdon gauge:

A. Have high creep strength to withstand high temperature

B. Be stable enough to maintain its calibration indefinitely

C. Be immune to corrosion from the fluid inside the tube, and from the atmosphere outside it

D. Be hard enough to withstand the applied pressure without any part of it being stressed above the limit of proportionality

E. Be easy to fabricate.

Explanation:

89. The commonly used unit of conductivity is:

A. mho

B. mho/m

C. n mho/cm

D. ohm/m

E. m mho/mm.

Explanation:

90. The operating characteristic which inherently assists the establishment of equilibrium is called :

A. corrective action

B. self regulation

C. automatic regulation

D. proportional control action

E. floating controller action.

Explanation: