Chemical Engineering - Chemical Engineering Basics

46. 

The hardenability of steel decreases with

A. decrease in dislocation density.
B. increase in solutionising temperature.
C. increase in strength.
D. decrease in grain size.

Answer: Option D

Explanation:

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47. 

Pick out the correct statement about the condensation.

A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation.
B. Suitable coating or vapour additive is used to promote film wise condensation.
C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it.
D. Reynolds number of condensing liquid is based on its mass flow rate.

Answer: Option B

Explanation:

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48. 

Change in volume of metals from absolute zero temperature to their melting points is

A. almost same for all metals.
B. different for different metals.
C. less for low melting point metals.
D. less for high melting point metals.

Answer: Option A

Explanation:

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49. 

Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.

A. creep
B. fatigue
C. endurance
D. tensile

Answer: Option B

Explanation:

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50. 

Alloy powder manufactured by the following process have spherical shapes.

A. Electrochemical deposition.
B. Gaseous reduction.
C. Atomisation.
D. Mechanical attrition.

Answer: Option C

Explanation:

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