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Process Control and Instrumentation

Process Control and Instrumentation
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Vycor (a glass)
Steel
Inconel
Nichrome

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

3
29
0.1
13

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Process Control and Instrumentation
Which of the following thermocouples has the least temperature measurement range?

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

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Process Control and Instrumentation
Continuous measurement of moisture content of paper in paper industry is done by measuring the

Electrical resistance through the paper
Magnetic susceptibility
Thermal conductivity through the paper
None of these

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Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Overdamped
Underdamped
Critically damped
Highly fluctuating

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Process Control and Instrumentation
pH meter has

One cell
No cell
Three cells
Two cells

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