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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 8
46.
Viscosity of gases __________ with increase in temperature.
increase very rapidly
increase slowly
decrease slowly
remain unaffected
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
What is the emissivity of a black body ?
1
0 
0.90
0.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
Steam is routed through the tube in case of a __________ evaporator.
basket type
horizontal tube
short tube vertical
long tube vertical
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
Dropwise condensation of steam on cooling surface is promoted
an oily surface.
when both the steam and the tube are clean.
only in presence of air.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is
0.1
>1
< 1
l
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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