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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 + et
1 - et
1 - e-t

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Process Control and Instrumentation
Gain margin is equal to the

Amplitude ratio
Reciprocal of amplitude ratio
Gain in P controller
Gain in P-I controller

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Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1
1/(S² + 1)
1/S²
1/S

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Process Control and Instrumentation
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

Controlled
Manipulated
Load
None of these

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 1
< 0.1
< 3
> 3

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Process Control and Instrumentation
The temperature range for which copper resistance thermometer can be used is __________ °C

0 to 150
500 to 900
350 to 750
-200 to 150

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