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 thermal conductivity
Increase of pressure
Differential linear expansion

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Process Control and Instrumentation
The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system

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

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