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GATE 2019: Heat Transfer Quiz 2
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Question 1
What is the minimum length of fin so as to consider it as fin of infinite length.
Question 2
In transient heat conduction process, the cooling effect takes place
Question 3
Determine the surface temperature of the brass plates leaving the oven having thermal diffusivity and thermal conductivity of 33.9×
/s and 110W/mK. The initial temperature is 25℃ and the surrounding temperature is 700℃. Take, h= 90W/
K, Length of brass plates =0.015m, time= 600sec
/s and 110W/mK. The initial temperature is 25℃ and the surrounding temperature is 700℃. Take, h= 90W/K, Length of brass plates =0.015m, time= 600sec Question 4
A long laddle is used to fry potatoes in hot oil kept at a temperature of 200℃ as shown in the figure. The section of the handle of the ladle is 6mm×18mm. The surroundings are at 27℃. The conductivity of the material is 195W/m℃. If the temperature at a distance of 350mm from the oil should not reach 45℃, determine the convective heat transfer coefficient.
Question 5
Two cylindrical shafts A and B at the same initial temperature are simultaneously placed in a furnace. The surfaces of the shafts remain at the furnace gas temperature at all times after they are introduced into the furnace. The temperature variation in the axial direction of the shafts can be assumed to be negligible. The data related to shafts A and B is given in the following Table.
The temperature at the centerline of the shaft A reaches 400℃after two hours. The time required (in hours) for the centerline of the shaft B to attain the temperature of 400℃ is _____ .
The temperature at the centerline of the shaft A reaches 400℃after two hours. The time required (in hours) for the centerline of the shaft B to attain the temperature of 400℃ is _____ .
Question 6
For the three-dimensional object shown in the figure below, five faces are insulated. The sixth face (PQRS), which is not insulated, interacts thermally with the ambient, with a convective heat transfer coefficient of 10 W/m2.K. The ambient temperature is 30 °C. Heat is uniformly generated inside the object at the rate of 100 W/m3. Assuming the face PQRS to be at uniform temperature, its steady state temperature is
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