Low thermal conductivity of heat insulating materials is due to its
A) Dense structure
B) High proportion of air space
C) High specific heat
D) None of these
Correct Answer:
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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,
Q19: Which of the following has the minimum
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
Q25: Leidenfrost point is a term concerned with
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