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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