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Process Control and Instrumentation

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
Pressure of 0.0001 absolute psi can be measured by __________ gauge

Mcloid
Pirani
Thermocouple
None of these

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

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

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Process Control and Instrumentation
On-off controllers are normally used for

Low loads
Flow rate changes
None of these
Temperature changes

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Process Control and Instrumentation
Positioning controllers are used for

Flow rate changes
Low loads
Temperature changes
High loads

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low flash point
Low thermal conductivity
Low electrical conductivity
High viscosity index

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