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Process Control and Instrumentation

Process Control and Instrumentation
Thermal wells used in temperature measurements should have

High transmissivity of radiation
Polished surface
Low emissivity
Very thick walls

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Process Control and Instrumentation
Humidity of air can be determined by a

Chromatograph
Sling psychrometer
Mass spectrometer
Polarimeter

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Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

> 1.7 and < 30°
> 1.7 and > 30°
< 1.7 and > 30°
< 1.7 and < 30°

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Process Control and Instrumentation
Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an

Zirconia probe
Thermal conductivity cell
Orsat apparatus
Chromatograph

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

High thermal conductivity
All of these
Small specific heat
Large area but small mass

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Routh test
None of these
Root locus methods
Frequency response methods

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MORE MCQ ON Process Control and Instrumentation

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