Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

A metal powder or graphite
Mercury
Air
Oil

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Process Control and Instrumentation
The characteristic equation for the control system with a closed loop transfer function Gā‚/1 + Gā‚‚ is given by 1 + Gā‚‚ = 0. The characteristic equation for the control system

Determines its stability
All of these
Is the same for set point or load changes
Depends only upon the open loop transfer function

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

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