Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 19
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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