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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
All the thermocouples used for temperature measurement use dissimilar metal

Strips
Bars
Beads
Wires

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Process Control and Instrumentation
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

Alcohol in glass thermometer
Mercury in glass thermometer
Nitrogen in steel thermometer
Fused metal (Na or K) in steel thermometer

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Process Control and Instrumentation
Thermal wells used in temperature measurements should have

Low emissivity
Polished surface
Very thick walls
High transmissivity of radiation

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Process Control and Instrumentation
Process degree of freedom indicates __________ number of controllers to be used.

Both maximum and the minimum
The minimum
Nothing about the
The maximum

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Process Control and Instrumentation
Bimetal strips are not used in

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

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