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Process Control and Instrumentation

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

Bulb
Bourdon tube
Pointer
None ofthese

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature.

Differential linear expansion
Increase of thermal conductivity
Volumetric expansion
Increase of pressure

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Process Control and Instrumentation
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

Platinum-platinum + rhodium
Chromel-alumel
Copper-constantan
Iron-constantan

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Process Control and Instrumentation
Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

Antimony
Nickel
Silver
Gold

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

Introducing integral control
Introducing derivative control
Reducing value of Kc
None of these

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Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

32° & 460°
0° & 80°
- 273° & 80°
32° & 80°

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