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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Zirconia probe is used for the measurement of

Speed of a submarine
% O₂ in flue gas
Humidity of air
% CO₂ in flue gas

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Bimetallic thermometer
Radiation pyrometer
Thermocouple
Mercury thermometer

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can measure higher temperature
Is more affected by corrosive atmosphere
Has a slower speed of response
Can't measure the temperature of moving objects

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Process Control and Instrumentation
On-off controllers are normally used for

Temperature changes
None of these
Flow rate changes
Low loads

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

Poor reproducibility
High measuring lag
High fidelity
High drift

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