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AE-JE (ME) || Heat Transfer Quiz - 2

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Question 1

On heat transfer surface, fins are provided ____________.

Question 2

Consider the following statements and choose the correct statements __________?

1) Fins should be attached on the side where heat transfer coefficient is small.

2) Effective new of fins depend on thermal conductivity only.

3) fins must have small thick new for better heat dissipation.

Question 3

Ideal shape of fin is

Question 4

In order to achieve maximum heat dissipation, the fin should be designed in such a way that :

Question 5

Two rods, one of length l and the other of length 2l , are made of the same material and have same diameter. Both ends of the longer rod are maintained at 100 °C. One end of the shorter rod is maintained at 100 °C while the other end is insulated. Both rods are exposed to the same environment at 40 °C. The temperature at the insulated end is measaured to be 55 °C The temperature at the midpoint of the longer rod would be:

Question 6

One end of two long, cylindrical rods of the same diameter but different materials, is attached to a base surface maintained at 100^oC. The surfaces of the rods are exposed to same ambient condition air at 20^oC. By traversing the length of each rod with a thermocouple, it was observed that the temperatures of the rods were equal at the positions