Process Control and Instrumentation
A bolometer is

An element which senses optical input and delivers thermal output
Neither A nor B Here
Used for the measurement of thermal radiation
Both A & B Here

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Process Control and Instrumentation
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

All of these
Reducing the volume of the receiving element to a minimum
Reducing the volume of the capillary to a minimum
Making the volume of thermometer bulb as large as conveniently possible

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