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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of moisture in paper is done by

Hair-hygrometer
Sling psychrometer
Weighing
High resistance Wheatstone's bridge circuit

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Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Conductors
Dielectrics
Insulators
Semi conductors

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Kc is increased
Derivative control action is introduced
Kc is reduced
Integral control action is introduced

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.5
1/√2
0.25
1

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Process Control and Instrumentation
In a single tank system, the transfer function of __________ to inlet flow rate is 1/TS+1.

Outlet flow rate
Both A & B Here
Level
Neither A nor B Here

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

Manipulated
Controlled
Load
None of these

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