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Process Instrumentation and Control - Interview Questions and Answers

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96. The change in length of humidity sensitive elements is measured by :
A. hydrometer
B. hygrometer
C. psychrometer
D. photometer
E. all of the above.
Explanation:
97. The quantity or condition of the controlled system which is directly, measured or controlled :
A. set point
B. deviation
C. controlled variable
D. command signal
E. control agent.
Explanation:
98. Industrial flow meters are based on :
A. rotational devices
B. flow through restrictions
C. flow around obstructions
D. all of above
E. none of above.
Explanation:
99. The condition of how much successive readings differ from one another for a fixed value of the variable is called :
A. accuracy
B. error
C. sensitivity
D. resolution
E. precision.
Explanation:
100. Mass-spring seismic sensors measure directly the :
A. displacement
B. velocity
C. acceleration
D. shock
E. force.
Explanation:
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