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Process Control and Instrumentation

Process Control and Instrumentation
__________ controller has the maximum stabilising time.

PD
P
PI
PID

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

Under damped
Critically damped
Over damped
None of these

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

Flow rate changes
None of these
Low loads
Temperature changes

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Glass gauge
Simple float
Differential float type manometer
None of these

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.0001
0.01
0.001
0.1

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Process Control and Instrumentation
Which of the following is not classified as a thermo electric pyrometer

Optical pyrometer (disappearing filament type)
Thermocouple
Resistance thermometer
Radiation pyrometer

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