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Process Control and Instrumentation

Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

(time)⁻¹
None of these
Velocity
Time

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Process Control and Instrumentation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

CO₂
O₂
N₂
CO

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Process Control and Instrumentation
Which of the following is not a second order instrument?

Pressure gauge with one bellow, two tubes and a tank
Mercury in glass thermometer with covering
Bare mercury in glass thermometer
None of these

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a functioning element.

Bulb
Pointer
None of these
Bourdon tube

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is

Volumetric expansion
None of these
Linear expansion
Pressure rise with temperature

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Liquid temperatures only
Very high temperatures only
Very low temperatures only

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