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PROCESS CONTROL AND INSTRUMENTATION

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

Bars
Strips
Wires
Beads

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

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

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

Very thick walls
Polished surface
High transmissivity of radiation
Low emissivity

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

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

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Process Control and Instrumentation
Bimetal strips are not used in

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

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