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Process Control and Instrumentation

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

Τds + 1
Eτds
1/(τds + 1)
E-τds

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Process Control and Instrumentation
Pirani gauge is used for the measurement of

Liquid level under pressure
Liquid level at atmospheric pressure
Very high pressure
High vacuum

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Process Control and Instrumentation
Which of the following thermocouple materials does not contain nickel?

Constantan
Alumel
None of these
Chromel

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Process Control and Instrumentation
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Chromel-constantan
Iron-constantan
All of these
Platinum-platinum + rhodium

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Process Control and Instrumentation
Nichol's chart deals with

Frequency response values of controllers
R. vs. phase lag of first order
R. vs. phase lag of second order
Closed loop values vs. open loop values

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Drift
None of these
Dead zone
Static error

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MORE MCQ ON Process Control and Instrumentation

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