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Process Control and Instrumentation

Process Control and Instrumentation
Pirani gauge is used for the measurement of

High vacuum
Liquid level under pressure
Very high pressure
Liquid level at atmospheric pressure

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

0, π/2
-π/2, π/2
- ∞, π/2
-π/2, 0

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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
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

Controlled
Manipulated
None of these
Load

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Process Control and Instrumentation
A bolometer is

An element which senses optical input and delivers thermal output
Neither A nor B Here
Used for the measurement of thermal radiation
Both A & B Here

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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
Peltier effect
Joule heating effect
Seebeck effect

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