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Chemical Engineering - Chemical Engineering Basics

Exercise : Chemical Engineering Basics - Section 21
46.
What is the range of tempering temperature (°C) for most of the materials ?
75-100
200-300
350-450
500-600
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Absorptivity of a grey body varies with the
wavelength of the incident ray.
temperature
both'a' & 'b'
neither 'a' nor 'b'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
In radiative heat transfer, a grey surface is the one, which has
emissivity independent of wavelength.
grey appearance to the eye.
zero reflectivity.
equal brightness in all directions.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
Overheating of satellites during re-entry to earth is controlled by
thick insulation.
ceramic lining.
cooling by flow of air over the surface.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
The most abundant metal present in the earth's crust is;
iron
copper
titanium
aluminium
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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