Chemical Engineering - Chemical Engineering Basics

41. 

The dew point of moist air becomes __________ with decrease in its relative humidity.

A. less than the wet bulb temperature
B. more than the wet bulb temperature
C. more than the dry bulb temperature
D. equal to wet bulb temperature

Answer: Option A

Explanation:

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42. 

Heating of ferromagnetic materials to a temperature above Curie temperature makes it

A. insulator for heat & electricity transmission.
B. ferritic.
C. behave like paramagnetic materials.
D. superconductor.

Answer: Option C

Explanation:

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43. 

Lap joints are preferred over butt joints in soldering/brazing, because these joints are

A. weaker in tension but stronger in shear.
B. weaker in shear but stronger in tension.
C. stronger in both shear and tension.
D. The lap joints are easily made.

Answer: Option D

Explanation:

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44. 

Colour comparator is used to measure the

A. pH value
B. electrode potential
C. colour intensity
D. none of these

Answer: Option A

Explanation:

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45. 

Pick out the wrong statement.

A. For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1.
B. For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work.
C. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel.
D. Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm.

Answer: Option B

Explanation:

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