Which of the following has the minimum thermal conductivity?
A) Nitrogen
B) Steel
C) Carbon black
D) Tar
Correct Answer:
Verified
Q14: Graetz number is given by
A)mCp/kL
B)kL/mCp
C)mCp/kµ
D)kµ/mCp
Q15: Thermal diffusivity is given by
A)k/?Cp
B)?Cp/k
C)µCp/a
D)µ/hCp
Q16: The rate of heat transfer is a
Q17: Reynold's analogy states that
A)Nst ? f
B)Nst ?
Q18: In case of a vertical tube evaporator,
Q20: Low thermal conductivity of heat insulating materials
Q21: For an ideal black body
A)Absorptivity = 1
B)Reflectivity
Q22: In a liquid-liquid heat exchanger, for the
Q23: For concentrating an aqueous solution of a
Q24: Small scale evaporation is done in a
A)Heat
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