Mechanical Engineering Exam > Mechanical Engineering Questions > Biot number signifies[1991]a)The ratio of hea...
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Biot number signifies
[1991]
- a)The ratio of heat conducted to heat convected
- b)The ratio of heat convected to heat conducted
- c)The ratio of external convective resistance to internal conductive resistance
- d)The ratio of internal conductive resistance to external convective resistance
Correct answer is option 'D'. Can you explain this answer?
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Biot number signifies[1991]a)The ratio of heat conducted to heat conve...
The Biot number is a dimensionless number used in heat transfer analysis. It represents the ratio of internal conductive resistance to external convective resistance in a system. In other words, it quantifies the relative importance of conduction and convection in heat transfer.
The Biot number is defined as:
Bi = hL / k
Where:
- Bi is the Biot number
- h is the convective heat transfer coefficient
- L is the characteristic length of the system
- k is the thermal conductivity of the material
Now, let's break down the options and see why option 'D' is the correct answer:
a) The ratio of heat conducted to heat convected
This is not the definition of the Biot number. The Biot number compares the internal conductive resistance to the external convective resistance, not the magnitudes of heat conducted and convected.
b) The ratio of heat convected to heat conducted
This is also not the correct definition. The Biot number does not compare the magnitudes of heat convected and conducted; it compares the resistances associated with convection and conduction.
c) The ratio of external convective resistance to internal conductive resistance
This is not the correct definition either. The Biot number compares the internal conductive resistance to the external convective resistance, not the other way around.
d) The ratio of internal conductive resistance to external convective resistance
This is the correct definition of the Biot number. It compares the resistance to heat transfer due to conduction within a solid (internal conductive resistance) to the resistance to heat transfer due to convection at the solid's surface (external convective resistance). A higher Biot number indicates that conduction is relatively more important, while a lower Biot number indicates that convection dominates the heat transfer process.
To summarize, the Biot number represents the ratio of internal conductive resistance to external convective resistance in a system. Option 'D' is the correct answer.
The Biot number is defined as:
Bi = hL / k
Where:
- Bi is the Biot number
- h is the convective heat transfer coefficient
- L is the characteristic length of the system
- k is the thermal conductivity of the material
Now, let's break down the options and see why option 'D' is the correct answer:
a) The ratio of heat conducted to heat convected
This is not the definition of the Biot number. The Biot number compares the internal conductive resistance to the external convective resistance, not the magnitudes of heat conducted and convected.
b) The ratio of heat convected to heat conducted
This is also not the correct definition. The Biot number does not compare the magnitudes of heat convected and conducted; it compares the resistances associated with convection and conduction.
c) The ratio of external convective resistance to internal conductive resistance
This is not the correct definition either. The Biot number compares the internal conductive resistance to the external convective resistance, not the other way around.
d) The ratio of internal conductive resistance to external convective resistance
This is the correct definition of the Biot number. It compares the resistance to heat transfer due to conduction within a solid (internal conductive resistance) to the resistance to heat transfer due to convection at the solid's surface (external convective resistance). A higher Biot number indicates that conduction is relatively more important, while a lower Biot number indicates that convection dominates the heat transfer process.
To summarize, the Biot number represents the ratio of internal conductive resistance to external convective resistance in a system. Option 'D' is the correct answer.
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Biot number signifies[1991]a)The ratio of heat conducted to heat convectedb)The ratio of heat convected to heat conductedc)The ratio of external convective resistance to internal conductive resistanced)The ratio of internal conductive resistance to external convective resistanceCorrect answer is option 'D'. Can you explain this answer?
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Biot number signifies[1991]a)The ratio of heat conducted to heat convectedb)The ratio of heat convected to heat conductedc)The ratio of external convective resistance to internal conductive resistanced)The ratio of internal conductive resistance to external convective resistanceCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Biot number signifies[1991]a)The ratio of heat conducted to heat convectedb)The ratio of heat convected to heat conductedc)The ratio of external convective resistance to internal conductive resistanced)The ratio of internal conductive resistance to external convective resistanceCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Biot number signifies[1991]a)The ratio of heat conducted to heat convectedb)The ratio of heat convected to heat conductedc)The ratio of external convective resistance to internal conductive resistanced)The ratio of internal conductive resistance to external convective resistanceCorrect answer is option 'D'. Can you explain this answer?.
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