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Process Control and Instrumentation

Process Control and Instrumentation
Mercury manometer (U-tube type) exemplifies a __________ order system.

First
Zero
Third
Second

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Process Control and Instrumentation
Composition of alloys can be determined by

None of these
Chromatograph
Polarograph
Refractrometer

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Process Control and Instrumentation
Phase margin is equal to

Phase lag + 180°
Phase lag - 180°
180° - phase lag
Phase lag + 90°

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

63.2
87.5
100
95

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Process Control and Instrumentation
Humidity of air can be determined by a

Mass spectrometer
Polarimeter
Chromatograph
Sling psychrometer

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Drift
Dead zone
Static error
None of these

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