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Process Control and Instrumentation

Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Gauge
Atmospheric
Absolute
Vacuum

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Process Control and Instrumentation
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

Iron-constantan thermocouple
Optical pyrometer
Alcohol filled thermometer
Mercury in glass thermometer

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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.

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

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Process Control and Instrumentation
Polarograph is meant for the analysis of

Isotopes
Miscible liquids
Gaseous mixture
Solids

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Linear relation of emf to temperature
Corrosion resistance
Oxidation resistance
Non-linear relation of emf to temperature

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Process Control and Instrumentation
The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

Corner
Resonant
Natural
Cross-over

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