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Process Control and Instrumentation

Process Control and Instrumentation
Bourdon gauges are used for measuring pressure (kg/cm² )

> 2 (gauge)
< atmospheric
> 10 (absolute)
< 2 (gauge)

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Process Control and Instrumentation
Which of the following thermocouples has the least temperature measurement range?

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

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 120°
Approaches 180° asymptotically
Is 30°
Is 90° at the most

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Process Control and Instrumentation
Which of the following is not a composition measuring instrument?

Hot wire anemometer
Mass spectrometer
Polarograph
Thermal conductivity cell

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

Time lag
Static error
Dead zone
Reproducibility

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Process Control and Instrumentation
Radiation thermometer can not measure the temperature

Of liquid oxygen
Inside a pressure vessel
Of an object without coming in contact with it
Of moving objects at high temperature

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