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Process Control and Instrumentation

Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

R/(TS + 1)
R/TS
L(TS + l)
1/TS

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Process Control and Instrumentation
Routh stability method uses __________ loop transfer function.

Closed
Open
Either A or B
Neither A nor B

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

Second order system
First order system
Transportation lag
None of these

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Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-I-D controller
P-D controller
P-controller
P-I controller

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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
2 AT
√AT

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Process Control and Instrumentation
Maximum differential pressure in liquid manometer is __________ psi.

30
20
50
40

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