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Process Control and Instrumentation

Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 - e-t
1 + e-t
1 - et
1 + et

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Process Control and Instrumentation
Psychrometer determines the

Humidity of gases
Hygroscopic nature of solids
Moisture content of solids
Water of crystallisation

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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.

Load
Controlled
None of these
Manipulated

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

Critically damped
Stable
Unstable
None of these

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

Product
None of these
Coolant
Reactants

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 3
< 1
< 0.1
> 3

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