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Process Control and Instrumentation

Process Control and Instrumentation
A non-linear system will have __________ steady state values.

Two
Three
One
More than one

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Process Control and Instrumentation
Nichol's chart deals with

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

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Process Control and Instrumentation
The function of a transducer is to

Modify the input signal
Convert the primary signal into a more useful quantity, usually an electric impulse
Amplify the input signal
Codify/decodify the input signal

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

Chromel-alumel
Iron-constantan
Copper-constantan
Platinum-platinum + rhodium

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Glass gauge
Differential float type manometer
None of these
Simple float

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Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

32° & 460°
- 273° & 80°
0° & 80°
32° & 80°

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