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Process Control and Instrumentation

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

None of these
Under damped
Critically damped
Over damped

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Decreases
Increases
Increases exponentially
Remains constant

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

Flow rate changes
Low loads
None of these
Temperature changes

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Process Control and Instrumentation
Which of the systems having following transfer functions is stable?

1/(s²-2s + 3)
1/(s² + 2s + 2)
Exp(-20s)/(s² + 2s-l)
1/(s²+ 2)

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Process Control and Instrumentation
Characteristic equation is the denominator of __________ loop transfer function.

Open
Both A & B Here
Neither A Nor B Here
Closed

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

Load
Both A & B
Neither A nor B
Set point

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