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Process Control and Instrumentation

Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Critically damped
Overdamped
Underdamped
Highly fluctuating

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

Controlled
None of these
Manipulated
Load

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Process Control and Instrumentation
Feed forward controller accounts for the __________ changes.

Load
Both A & B
Set point
Neither A nor B

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Process Control and Instrumentation
Radiation thermometer can not measure the temperature

Inside a pressure vessel
Of moving objects at high temperature
Of an object without coming in contact with it
Of liquid oxygen

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Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Reproducibility
Dead zone
Static error
Time lag

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Process Control and Instrumentation
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

Turbine flowmeter
Pitot tube
Magnetic flowmeter
Flow nozzle type flowmeter

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