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Consider the following statements:
If a surface is pock-marked with a number of cavities, then ascompared to a smooth surface.
1. Radiation will increase
2. Nucleate boiling will increase
3. Conduction will increase
4. Convection will increaseOf these statements:
If a surface is pock-marked with a number of cavities, then ascompared to a smooth surface.
1. Radiation will increase
2. Nucleate boiling will increase
3. Conduction will increase
4. Convection will increaseOf these statements:
- a)1, 2 and 3 are correct
- b)1, 2 and 4 are correct
- c)1, 3 and 4 are correct
- d)2, 3 and 4 are correct
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:If a surface is pock-marked with a n...
Ans. (b) If coefficient of friction is increased radiation will decrease.
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Consider the following statements:If a surface is pock-marked with a n...
Explanation:
The given statement states that if a surface is pock-marked with a number of cavities, then as compared to a smooth surface, certain characteristics will increase. Let's analyze each statement one by one:
1. Radiation will increase:
When a surface is pock-marked with cavities, the overall surface area increases. As the surface area increases, the amount of radiation emitted or absorbed by the surface also increases. This is because radiation is directly proportional to the surface area. Therefore, the statement is correct.
2. Nucleate boiling will increase:
Nucleate boiling occurs when small bubbles form at nucleation sites on a heated surface. These nucleation sites are provided by surface irregularities such as cavities. When a surface is pock-marked with cavities, it provides more nucleation sites, resulting in an increased nucleate boiling phenomenon. Therefore, the statement is correct.
3. Conduction will increase:
Conduction is the transfer of heat through direct contact between two solids. When a surface is pock-marked with cavities, it increases the surface area available for heat transfer. As a result, the conduction of heat from one solid surface to another increases. Therefore, the statement is correct.
4. Convection will increase:
Convection is the transfer of heat through the movement of a fluid (liquid or gas). When a surface is pock-marked with cavities, it creates turbulence in the fluid flow. This turbulence enhances the heat transfer by convection. Therefore, the statement is correct.
Conclusion:
From the analysis of each statement, it can be concluded that statements 1, 2, and 4 are correct. Hence, the correct answer is option 'B' - 1, 2, and 4 are correct.
The given statement states that if a surface is pock-marked with a number of cavities, then as compared to a smooth surface, certain characteristics will increase. Let's analyze each statement one by one:
1. Radiation will increase:
When a surface is pock-marked with cavities, the overall surface area increases. As the surface area increases, the amount of radiation emitted or absorbed by the surface also increases. This is because radiation is directly proportional to the surface area. Therefore, the statement is correct.
2. Nucleate boiling will increase:
Nucleate boiling occurs when small bubbles form at nucleation sites on a heated surface. These nucleation sites are provided by surface irregularities such as cavities. When a surface is pock-marked with cavities, it provides more nucleation sites, resulting in an increased nucleate boiling phenomenon. Therefore, the statement is correct.
3. Conduction will increase:
Conduction is the transfer of heat through direct contact between two solids. When a surface is pock-marked with cavities, it increases the surface area available for heat transfer. As a result, the conduction of heat from one solid surface to another increases. Therefore, the statement is correct.
4. Convection will increase:
Convection is the transfer of heat through the movement of a fluid (liquid or gas). When a surface is pock-marked with cavities, it creates turbulence in the fluid flow. This turbulence enhances the heat transfer by convection. Therefore, the statement is correct.
Conclusion:
From the analysis of each statement, it can be concluded that statements 1, 2, and 4 are correct. Hence, the correct answer is option 'B' - 1, 2, and 4 are correct.
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Consider the following statements:If a surface is pock-marked with a number of cavities, then ascompared to a smooth surface.1. Radiation will increase2. Nucleate boiling will increase3. Conduction will increase4. Convection will increaseOf these statements:a)1, 2 and 3 are correctb)1, 2 and 4 are correctc)1, 3 and 4 are correctd)2, 3 and 4 are correctCorrect answer is option 'B'. Can you explain this answer?
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