Heat transfer by radiation is encountered least in mcq is given below:
|Q. Heat transfer by radiation is encountered least in
(a) boiler furnace
(b) insulated steam pipe
(c) electric bulb
(d) nuclear reactor
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Heat transfer by radiation is one of the three fundamental modes of heat transfer, along with conduction and convection. It involves the transfer of thermal energy through electromagnetic waves without the need for a medium or direct contact between objects.
When considering a nuclear reactor, it is designed to contain and control nuclear reactions for the purpose of generating electricity. In this context, the heat transfer by radiation is encountered least in a nuclear reactor compared to a boiler furnace, insulated steam pipe, and an electric bulb. Reasons given below:
- Nuclear Reactor: In a nuclear reactor, the primary mode of heat transfer is conduction. The reactor core, which contains the nuclear fuel, is surrounded by a coolant, such as water or gas, which absorbs the heat produced by nuclear reactions. The transfer of heat within the reactor primarily occurs through the movement of the coolant, known as convection, and through direct contact between the fuel and the coolant, known as conduction. Since the reactor is designed to confine the heat within the system, the contribution of heat transfer by radiation is minimal.
- Boiler Furnace: In a boiler furnace, heat transfer occurs through a combination of conduction, convection, and radiation. The furnace chamber is designed to burn fuel, such as coal or natural gas, to generate heat. The hot gases produced by combustion transfer heat to the surrounding boiler tubes through convection. Additionally, radiation plays a significant role in heat transfer within the furnace as the high-temperature flames and hot surfaces emit thermal radiation, which is absorbed by the surrounding surfaces.
- Insulated Steam Pipe: In an insulated steam pipe, the primary mode of heat transfer is conduction. Steam, which carries thermal energy, flows through the pipe, and the pipe’s insulation is designed to minimize heat loss to the surroundings. While radiation can contribute to heat transfer, especially if the pipe is exposed to high-temperature environments, the presence of insulation significantly reduces the impact of radiation compared to conduction through the pipe material.
- Electric Bulb: In an electric bulb, heat transfer occurs through conduction, convection, and radiation. The bulb filament, typically made of tungsten, is heated to a high temperature when electricity passes through it, producing visible light and heat. The heat is primarily transferred through radiation, as the filament emits thermal radiation in the form of visible light and infrared radiation. The bulb’s design is optimized to maximize light output while minimizing heat transfer to the surrounding environment.
In summary, heat transfer by radiation is encountered least in a nuclear reactor compared to a boiler furnace, insulated steam pipe, and an electric bulb. This is due to the dominant heat transfer mechanisms in each system, with nuclear reactors relying primarily on conduction, while the other examples involve a more significant contribution from radiation.
I hope this explanation clarifies the concept of heat transfer by radiation in these different scenarios. If you have any further questions, please feel free to ask.
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