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Process Control and Instrumentation

Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Wien's law
Kirchoff's law
Peltier effect
Seebeck effect

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

Sling psychrometer
Chromatograph
Mass spectrometer
Polarimeter

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.001
0.0001
0.01
0.1

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Process Control and Instrumentation
Liquid column manometers are used for measuring the pressure __________ kgf/cm² .

< 3 (gage)
< atmospheric
< 10 (gage)
> 2(gage)

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Process Control and Instrumentation
Gain margin is equal to the

Gain in P controller
Gain in P-I controller
Amplitude ratio
Reciprocal of amplitude ratio

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Process Control and Instrumentation
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

PH meter
Polarograph
Polarimeter
Chromatograph

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