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Process Control and Instrumentation

Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Platinum-platinum+rhodium
Copper-constantan
Aluminium-chromel
None of these

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

None of these
Stable
Unstable
Critically damped

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Process Control and Instrumentation
Flapper nozzle is used in a/an __________ controller.

Hydraulic
None of these
Electronic
Pneumatic

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Increases exponentially
Decreases
Remains constant
Increases

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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

Thermal conductivity cell
Orsat apparatus
Zirconia probe
Chromatograph

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Process Control and Instrumentation
For measuring the temperature of a red hot furnace, which is the most suitable instrument?

Thermocouple
Platinum resistance thermometer
Bimetallic thermometer
Optical pyrometer

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