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Heat Transfer Quiz 2
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Question 1
Grashoff’s number is the ratio of
Question 2
For the radation between two infinite parallel planes of emissivity 
and 
respectively, which one of the following is the following is the following is the expression for emissity factor?
and respectively, which one of the following is the following is the following is the expression for emissity factor? Question 3
A composite wall is formed of a 5 cm copper plate, a 3.5 mm layer of asbestos, and a 4 cm layer of fiberglass. The wall is subjected to an overall temperature difference of 510 °C. Calculate the heat flow per unit area through the composite structure. Thermal conductivity of copper, asbestos and fiber glass are 370, 0.4 and 1.5 W/m °C respectively.
Question 4
In a heat exchanger, the hot gases enter with a temperature of 1500 C and leave at 750 C. The cold fluid enters at 250 C and leaves at 1250 C. The capacity ratio of the exchanger is
Question 5
Air can be best heated by steam in heat exchanger of
Question 6
Which of the following element have highest thermal conductivity?
Question 7
The equation of effectiveness 
for a heat exchanger is valid in the case of
for a heat exchanger is valid in the case of Question 8
Consider the diagram given below. Which one of the following is correct?
Question 9
Which one of the following non-dimensional numbers is used for transition from laminar to turbulent flow in free convection?
Question 10
Schmidt number is ratio of which of the following?
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