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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High fidelity
Poor reproducibility
High drift
High measuring lag

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Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

A second order system
A first order time lag
Dead time system
A first order system

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Process Control and Instrumentation
Which of the following is not a second order instrument?

Mercury in glass thermometer with covering
Pressure gauge with one bellow, two tubes and a tank
Bare mercury in glass thermometer
None of these

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

100
95
87.5
63.2

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Process Control and Instrumentation
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'

Reumur
Farenhite
Rankine
Celcius

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Process Control and Instrumentation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

N₂
CO₂
O₂
CO

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