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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

None of these
Flow rate changes
Temperature changes
Low loads

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Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Thermo electric pyrometer
Mercury in glass thermometer
Radiation/infrared pyrometer
Filled system thermometer

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

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

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Process Control and Instrumentation
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

NO
CO₂
O₂
NO₂

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Radiation pyrometer
Thermocouple
Mercury thermometer
Bimetallic thermometer

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Process Control and Instrumentation
Change of angle of refraction with composition comprises the working principle of a

Spectrometer
Polarograph
Polarimeter
Refractrometer

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