Chemical Engineering - Process Control and Instrumentation

6. 

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

A. - 273° & 80°
B. 0° & 80°
C. 32° & 460°
D. 32° & 80°

Answer: Option B

Explanation:

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7. 

Which of the following is not a composition measuring instrument ?

A. Thermal conductivity cell
B. Mass spectrometer
C. Polarograph
D. Hot wire anemometer

Answer: Option D

Explanation:

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8. 

Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

A. chromel-alumel
B. iron-constantan
C. platinum-platinum+rhodium
D. none of these.

Answer: Option A

Explanation:

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9. 

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

A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum + rhodium
D. Copper-constantan

Answer: Option C

Explanation:

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10. 

Platinum resistance thermometer is the international standard for temperature measurement between

A. triple point of hydrogen and freezing point of antimony
B. 13.81°K to 903.9°K
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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