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Process Control and Instrumentation

Process Control and Instrumentation
Specific gravity of a liquid can not be measured by a/an

Hydrometer
Anemometer
Specific gravity bottle
Pycnometer

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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
Water
Mercury
Methyl alcohal

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Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Helium
None of these
Hydrogen
Nitrogen

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Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Solid semi-conductor
Conductor
Liquid semi-conductor
Insulator

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 30°
Is 120°
Is 90° at the most
Approaches 180° asymptotically

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Process Control and Instrumentation
Thermal conductivity measurement com-prises the working principle of a

CO₂ analyser
Polarimeter
Spectrometer
Chromatograph

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