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Process Control and Instrumentation

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

Platinum resistance thermometer
Optical pyrometer
Thermocouple
Bimetallic thermometer

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Grows linearly with time
Grows exponentially with time
Is a constant
Decays linearly with time

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Process Control and Instrumentation
High temperature of around 2000°C of incandescent gas mantles is measured by a/an

Radiation pyrometer
Specially designed thermocouple
None of these Here
Optical pyrometer

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Process Control and Instrumentation
The fluid used in hydraulic controller is

Steam
Oil
Air
Water

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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
12
54
68

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Process Control and Instrumentation
Volumetric expansion is the working principle of the __________ thermometers.

Vapor pressure
Mercury in glass
Constant volume gas
Bimetallic

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