Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Radiation pyrometer
Platinum resistance thermometer
Mercury in glass thermometer
Vapor pressure thermometer

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Process Control and Instrumentation
In a second order under damped system, the

Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
Time required for the response of first reach its ultimate value is called the response time
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e
None of these

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