Chemical Engineering - Process Control and Instrumentation

41. 

Which of the following is not a mechanical pressure sensing element ?

A. Bellows
B. Diaphragm
C. Bourdon tube
D. U-tube

Answer: Option D

Explanation:

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42. 

__________ are analysed using a polarograph.

A. Isotonic solutions
B. Solids
C. Liquids
D. Gases

Answer: Option B

Explanation:

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43. 

Which of the following judges the accuracy of an instrument ?

A. Dead zone
B. Drift
C. Static error
D. None of these

Answer: Option C

Explanation:

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44. 

On-off controllers are normally used for

A. low loads
B. temperature changes
C. flow rate changes
D. none of these

Answer: Option A

Explanation:

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45. 

Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

A. low thermal conductivity.
B. low electrical conductivity.
C. high viscosity index.
D. low flash point.

Answer: Option B

Explanation:

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