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

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

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Process Control and Instrumentation
Select the correct statement from the following.

The frequency response of a pure capacity process is unbounded
The phase lag of a pure time delay system decreases with increasing frequency
The amplitude ratio of a pure time delay system increases with frequency
The amplitude ratio of a pure capacity process is inversely proportional to frequency

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