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Process Control and Instrumentation

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

None of these
Controlled
Load
Manipulated

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Process Control and Instrumentation
__________ type of element is normally not used in the bimetallic thermometers.

Flat spiral
Bourdon tube
Single helix
Multiple helix

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Inversely proportional to the square root of
Proportional to
Proportional to the square root of
Inversely proportional to the square of

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Process Control and Instrumentation
__________ controller has the maximum stabilising time.

PID
PD
P
PI

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High fidelity
High drift
High measuring lag
Poor reproducibility

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

Iron-constantan
Copper - constantan
Platinum - platinum + rhodium
Chromel - alumel

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