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Process Control and Instrumentation

Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Bimetallic
Vapor pressure
Mercury in glass
Resistance

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes less oscillatory (frequency decreases)
Gets amplified (magnitude increases)
Becomes more oscillatory (frequency increases)
Gets attenuated (magnitude decreases)

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Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 - e-t
1 + e-t
1 - et
1 + et

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Elimination of offset
Reduction of stability time
None of these

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

Unstable
None of these
Critically damped
Stable

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Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

1.5 AT
0.5 AT
√AT
2 AT

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