Process Control and Instrumentation - Chemical Engineering Questions and Answers

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Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity ?

CO₂

N₂

O₂

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Emf generated in a thermocouple depends on the temperature

of cold junction only.

of hot junction only.

difference between hot and cold junctions.

difference between cold junction and atmospheric temperature.

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

increase of pressure

increase of thermal conductivity

volumetric expansion

differential linear expansion

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The Laplace transform of a sinusoidal function (eg; sin at) is represented by the curve

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Number of poles in a system with transfer function is

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Radiation thermometer can not measure the temperature

inside a pressure vessel.

of an object without coming in contact with it.

of liquid oxygen.

of moving objects at high temperature.

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Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

antimony

gold

silver

nickel

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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 ?

CO₂

O₂

NO₂

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Dilatometer is used to measure

stress

strain

deflection

contraction/expansion due to changes in temperature