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Process Control and Instrumentation

Process Control and Instrumentation
Thermal wells used in temperature measurements should have

High transmissivity of radiation
Polished surface
Very thick walls
Low emissivity

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Process Control and Instrumentation
Polarograph is meant for the analysis of

Solids
Isotopes
Gaseous mixture
Miscible liquids

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc/τD s
Kc(1+τD s)
Kc τD s
Kc(1 +1/τD s)

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Process Control and Instrumentation
Stalagmometer is used for the measurement of

Optical activity
Surface tension
Kinematic viscosity
Refractive index

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Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Semi conductors
Dielectrics
Insulators
Conductors

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)0.5
Decibel = 20 loge (AR)
Decibel = 20 log10 (AR)

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