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Process Control and Instrumentation

Process Control and Instrumentation
For an input forcing function, X(t) = 2t², the Laplace transform of this function is

4/s³
2/s³
4/s²
2/s²

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Process Control and Instrumentation
Which of the following can measure temperatures in the range of - 20 to 300°C ?

Resistance thermometer
Vapor pressure thermometer
None of these
Mercury in glass thermometer

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Process Control and Instrumentation
Pyrometry refers to the measurement of temperature

With the mercurial thermometer upto 350°C
All of these
Directly
Which is of higher magnitude

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

1/(τds + 1)
Eτds
E-τds
Τds + 1

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Corrosion resistance
Oxidation resistance
Linear relation of emf to temperature
Non-linear relation of emf to temperature

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Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Difference between cold junction and atmospheric temperature
Of cold junction only
Of hot junction only
Difference between hot and cold junctions

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