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Process Control and Instrumentation

Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Product
Coolant
Reactants
None of these

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Volume
All of these
Viscosity
Pressure

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Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

R/TS
L(TS + l)
1/TS
R/(TS + 1)

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Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Reduce measuring lag
Increase the fidelity
Increase the sensitivity
Guard against corrosive and oxidising action on thermocouple materials

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

Highly fluctuating
Critically damped
Overdamped
Underdamped

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can measure higher temperature
Has a slower speed of response
Can't measure the temperature of moving objects
Is more affected by corrosive atmosphere

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