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Process Control and Instrumentation

Process Control and Instrumentation
Psychrometer determines the

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

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Process Control and Instrumentation
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?

CO
N₂
CO₂
O₂

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Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Resistance
Bimetallic
Mercury in glass
Vapor pressure

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

20
-20
10
-10

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Process Control and Instrumentation
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

-38.9
-80.9
-60.9
-11.9

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Carbon-tetrachloride
Methyl alcohal
Water
Mercury

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