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MCQ: Heat Transfer, GATE PDF Download
A building has to be maintained at 21°C (dry bulb) and 14.5°C. The outside temperature is –23°C (dry bulb) and the internal and external surface heat transfer coefficients are 8 W/m2K and 23 W/m2K respectively. If the building wall has a thermal conductivity of 1.2W/mK, the minimum thickness (in m) of the wall required to prevent condensation is:a)0.471b)0.407c)0.321d)0.125Correct answer is option 'B'. Can you explain this answer?
Ref: https://edurev.in/question/537829/A-building-has-to-be-maintained-at-21C-dry-bulb-and-14-5C-The-outside-temperature-is-23C-dry-bul
DBT = 21°C
WBT = 14.5°C
Dew point temp = 10.17°C
Tout = -23°C
hin = 8 W/m2k
hout = 23 W/m2k
k = 1.2 W/mk
FAQs on MCQ: Heat Transfer, GATE
| 1. What is heat transfer and why is it important in engineering? |  |
Ans. Heat transfer is the process of exchanging thermal energy between objects or systems due to a temperature difference. It is important in engineering as it helps in designing efficient cooling or heating systems, understanding the behavior of materials at different temperatures, and predicting the performance of various industrial processes.
| 2. What are the three modes of heat transfer? | |
Ans. The three modes of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between particles or objects. Convection is the transfer of heat through the movement of fluid (liquid or gas). Radiation is the transfer of heat through electromagnetic waves.
| 3. How does conduction heat transfer work? | |
Ans. Conduction heat transfer occurs when two objects at different temperatures are in direct contact with each other. The heat is transferred from the object with higher temperature to the object with lower temperature through molecular collisions. The rate of conduction heat transfer depends on the thermal conductivity of the materials and the temperature difference between the objects.
| 4. What is the difference between convection and conduction heat transfer? | |
Ans. Conduction heat transfer occurs through direct contact between objects, while convection heat transfer occurs through the movement of fluid. In conduction, heat is transferred by molecular collisions, whereas in convection, heat is transferred through the bulk movement of the fluid. Convection is more effective in transferring heat over long distances compared to conduction.
| 5. How does radiation heat transfer work? | |
Ans. Radiation heat transfer occurs through electromagnetic waves without the need for a medium or direct contact between objects. All objects emit and absorb electromagnetic radiation based on their temperature. The rate of radiation heat transfer depends on the temperature difference between the objects and their emissivity, which is the ability to emit and absorb radiation.
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