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Process Control and Instrumentation

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

Farenhite
Rankine
Reumur
Celcius

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Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

36
68
54
12

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Process Control and Instrumentation
Psychrometer determines the

Hygroscopic nature of solids
Moisture content of solids
Humidity of gases
Water of crystallisation

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Process Control and Instrumentation
Zirconia probe is used for the measurement of

Humidity of air
% O₂ in flue gas
% CO₂ in flue gas
Speed of a submarine

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/12
π/3
5π/12
π/6

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

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

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