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Process Control and Instrumentation

Process Control and Instrumentation
The term analogous to voltage in a single tank system is the

Level of liquid
Heat content of the system
Liquid volume in the tank
Flow rate

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Process Control and Instrumentation
Which of the following fluid flow measuring devices can measure the largest flow rate?

Orificemeter
Rotameter
V-notch
Weir

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Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Hydrogen
Helium
Nitrogen
None of these

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Derivative control action is introduced
Kc is reduced
Integral control action is introduced
Kc is increased

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Decays linearly with time
Grows linearly with time
Is a constant
Grows exponentially with time

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

Iron-constantan
Platinum - platinum + rhodium
Copper - constantan
Chromel - alumel

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