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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

Eτds
1/(τds + 1)
Τds + 1
E-τds

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Process Control and Instrumentation
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

O₂
NO₂
NO
CO₂

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Process Control and Instrumentation
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a

Beckman thermometer
Dilatometer
Bimetallic thermometer
Mercury thermometer

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Process Control and Instrumentation
Which of the following thermocouples has the widest temperature measurement range?

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

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

Increase of pressure
Differential linear expansion
Increase of thermal conductivity
Volumetric expansion

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

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

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