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Process Control and Instrumentation

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

Load
Manipulated
None of these
Controlled

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Process Control and Instrumentation
The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches

-1
∞
1

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Process Control and Instrumentation
Dome temperature of blast furnace stove is most accurately measured by a

Radiation pyrometer
Platinum-platinum/rhodium ther-mocuple
Platinum resistance thermometer
Iron-constantan thermocouple

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H(1 + G)
G/H
G/(1 + H)
H/G

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Process Control and Instrumentation
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

Chromatograph
PH meter
Polarimeter
Polarograph

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Differential float type manometer
None of these
Simple float
Glass gauge

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