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Chemical Engineering - Chemical Engineering Basics

Exercise : Chemical Engineering Basics - Section 26
36.
Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Pick out the wrong statement about coating/electroplating of metals.
Phosphate coating is used as an excellent base for paints & enamels.
Phosphate coating is less corrosion resistant than chromate coating.
The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode.
Calorising is the process of coating steel with chromium.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).
mechanical
overall
volumetric
impeller
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Brinell hardness number (BHN) of a material is a number, which has
no dimension.
unit of length.
unity of force/area.
unit of force/length.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Vanadium addition to steel improves its
high temperature oxidation resistance.
fatigue strength.
heat treatability by quenching.
hardenability.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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