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Process Control and Instrumentation

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
The thermal emf-temperature relationship of most thermocouples is

Square root
Parabolic
Linear
Exponential

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Process Control and Instrumentation
Bimetal strips are not used in

Thermostats
Bimetallic thermometers
Thermocouples
Relays for opening & closing of electrical circuits

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Process Control and Instrumentation
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

Radiation
None of these
Photoelectric
Optical

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Process Control and Instrumentation
Radiation thermometer can not measure the temperature

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

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Process Control and Instrumentation
Psychrometer determines the

Hygroscopic nature of solids
Water of crystallisation
Humidity of gases
Moisture content of solids

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