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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
Polarograph is meant for the analysis of

Isotopes
Solids
Gaseous mixture
Miscible liquids

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

25
75
100

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Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

< 1.7 and > 30°
> 1.7 and < 30°
< 1.7 and < 30°
> 1.7 and > 30°

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

Static error
Drift
None of these
Dead zone

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Process Control and Instrumentation
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.

Manipulated
Controlled
Load
None of these

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