Chemical Engineering - Chemical Engineering Basics

46. 

What is the range of tempering temperature (°C) for most of the materials ?

A. 75-100
B. 200-300
C. 350-450
D. 500-600

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

47. 

Absorptivity of a grey body varies with the

A. wavelength of the incident ray.
B. temperature
C. both'a' & 'b'
D. neither 'a' nor 'b'

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

48. 

In radiative heat transfer, a grey surface is the one, which has

A. emissivity independent of wavelength.
B. grey appearance to the eye.
C. zero reflectivity.
D. equal brightness in all directions.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

49. 

Overheating of satellites during re-entry to earth is controlled by

A. thick insulation.
B. ceramic lining.
C. cooling by flow of air over the surface.
D. none of these.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

50. 

The most abundant metal present in the earth's crust is;

A. iron
B. copper
C. titanium
D. aluminium

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

« Prev   1 2 3 4 5 6 7 8 9 10