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Process Control and Instrumentation

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

None of these
Load
Manipulated
Controlled

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

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Approaches 180° asymptotically
Is 120°
Is 90° at the most
Is 30°

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Process Control and Instrumentation
Gas chromatography is used for the measurement of

Pressure
Temperature
Flow rate
Concentration

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

63.2
100
87.5
95

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc τD s
Kc(1+τD s)
Kc(1 +1/τD s)
Kc/τD s

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