Process Control and Instrumentation
A bolometer is

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

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Process Control and Instrumentation
For a feed back control system to be stable, the

Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Roots of the characteristic equation should be real
Poles of the closed loop transfer function should lie in the right half of the complex plane
Poles of the closed loop transfer function should lie in the left half of the complex plane

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