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Process Control and Instrumentation

Process Control and Instrumentation
Strain gage pressure transducers are used to measure __________ pressures.

Both A & B Here
Neither A nor B
Gage as well as vacuum
Absolute as well as differential

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Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Guard against corrosive and oxidising action on thermocouple materials
Reduce measuring lag
Increase the fidelity
Increase the sensitivity

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Process Control and Instrumentation
Psychrometer determines the

Moisture content of solids
Water of crystallisation
Humidity of gases
Hygroscopic nature of solids

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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/6
π/3
5π/12

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Process Control and Instrumentation
In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.

Semi-log
Ordinary
Triangular
Log-lag

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Process Control and Instrumentation
Bourdon tube is never made of

Stainless steel
Phosphor bronze
Cast iron
Monel metal

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