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Process Control and Instrumentation

Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Elimination of offset
None of these
Reduction of stability time

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

R - C
1/RC
RC
R + C

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Process Control and Instrumentation
Which of the following is the dynamic characteristics of an instrument?

Sensitivity
Dead zone
Fidelity
Reproducibility

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

None of these
Manipulated
Controlled
Load

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Oil
A metal powder or graphite
Air
Mercury

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Process Control and Instrumentation
Continuous measurement of moisture content of paper in paper industry is done by measuring the

None of these
Magnetic susceptibility
Electrical resistance through the paper
Thermal conductivity through the paper

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