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Process Control and Instrumentation

Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D
D³
D²
D⁴

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Process Control and Instrumentation
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same

All of these
Temperature measuring range (- 40°C to 450°C)
Speed of response
Accuracy (± 1% of span)

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Process Control and Instrumentation
Composition of natural gas is determined by the

Mass spectrometer
Both B and C
Haldane apparatus
Chromatograph

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Process Control and Instrumentation
The function of a transducer is to

Amplify the input signal
Codify/decodify the input signal
Convert the primary signal into a more useful quantity, usually an electric impulse
Modify the input signal

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

High measuring lag
High fidelity
High drift
Poor reproducibility

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Process Control and Instrumentation
In second order underdamped system,

Decay ratio = overshoot
Decay ratio = (overshoot)²
Overshoot increases for increasing damping co-efficient
Large damping co-efficient means smaller damping

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