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Process Control and Instrumentation

Process Control and Instrumentation
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

None of these
Nitrogen
Helium
Hydrogen

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Thomson effect
Seebeck effect
Joule heating effect
Peltier effect

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Kc is increased
Integral control action is introduced
Derivative control action is introduced
Kc is reduced

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Process Control and Instrumentation
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

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

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Process Control and Instrumentation
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

Bimetallic thermometer
Radiation pyrometer
None of these
Mercury thermometer

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Process Control and Instrumentation
Polarograph is meant for the analysis of

Gaseous mixture
Miscible liquids
Solids
Isotopes

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