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Process Control and Instrumentation

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

40
20
30
50

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

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

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Process Control and Instrumentation
Process degree of freedom indicates __________ number of controllers to be used.

Both maximum and the minimum
The maximum
The minimum
Nothing about the

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
E-τds
1/(τds + 1)
Eτds

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

-1
44020
43838
1

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Process Control and Instrumentation
If response of a control system is to be free of offset and oscillation, the most suitable controller is

Proportional controller
Proportional-derivative(PD)controller
Proportional integral-derivative (PID) controller
Proportional-integral (PI) controller

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