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Chemical Engineering - Chemical Engineering Basics

Exercise : Chemical Engineering Basics - Section 11
31.
A thermally thin body is the one for which
Biot number is less than 0.1.
Gallileo number is less than 0.1.
Fourier number is less than 0.1.
Fourier number is greater than 0.1.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Air refrigeration cycle is used in the air crafts, because of
low temperature encountered at high altitude.
its high heat transfer rate.
its low unit weight per ton of refrigeration.
its higher co-efficient of performance (COP).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
Failure of a material is attributed to __________ if it fails below its yield point.
impact loading
fatigue
creep
straining
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is
reduced preferentially.
cheaper.
oxidised preferentially.
lighter.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly ?
Cobalt: It contributes to rerl hardness by hardening ferrite.
Molybdenum: It forms abrasion resisting particles.
Phosphorous: It improves machinability in free cutting steels.
Silicon: It reduces oxidation resistance.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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