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Process Control and Instrumentation

Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Product
Coolant
Reactants
None of these

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/12
π/3
5π/12
π/6

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Very high temperatures only
Both high and low temperatures
Very low temperatures only
Liquid temperatures only

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Process Control and Instrumentation
Which of the following measurements can be made by the measurement of emf?

All of these
Composition of complex ions
Degree of hydrolysis
PH value

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Process Control and Instrumentation
Nichol's chart deals with

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

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Process Control and Instrumentation
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

Radiation
Optical
Photoelectric
None of these

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