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Process Control and Instrumentation

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

Reproducibility
Time lag
Static error
Dead zone

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

RC
R + C
R - C
1/RC

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Process Control and Instrumentation
A simple pitot tube measures the

Point velocity
Average velocity
Static pressure
Maximum velocity

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Product
Sum
Ratio
Difference

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Process Control and Instrumentation
Liquid discharge from a tank or reservoir can not be measured by

Mouthpieces
Notches
Weirs
Orificemeters

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Process Control and Instrumentation
Emission spectroscopy is used for

Solids and metal analysis
NOxdetermination
Determination of CO₂ in gases
Determining water purity

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