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A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK. If a temperature difference of 60°C is imposed across it, what is the heat flow?
- a)120W
- b)140W
- c)160W
- d)180W
Correct answer is 'A'. Can you explain this answer?
Verified Answer
A plane wall is 25 cm thick with an area of 1 m2, and has a thermal co...
We know, Q = kA(dT/dx)
Where, k = thermal conductivity = 0.5,
A = area = 1 m^2,
dT = temperature difference = 60 deg C,
dx = thickness = 25 cm = 0.25 m
So, Q = 0.5 x 1 x (60/0.25) = 120 W
Hence Option (A) is correct
For Notes on Modes Of Heat Transfer click on the link given below:
Most Upvoted Answer
A plane wall is 25 cm thick with an area of 1 m2, and has a thermal co...
Given Data:
Thickness of wall (L) = 25 cm = 0.25 m
Area of wall (A) = 1 m^2
Thermal conductivity (K) = 0.5 W/mK
Temperature difference (ΔT) = 60°C
Calculation:
Heat flow (Q) can be calculated using the formula:
Q = (K × A × ΔT) / L
Substituting the given values in the formula, we get:
Q = (0.5 × 1 × 60) / 0.25
Q = 120 W
Therefore, the heat flow through the plane wall is 120 W.
Answer: Option (a) 120 W.
Thickness of wall (L) = 25 cm = 0.25 m
Area of wall (A) = 1 m^2
Thermal conductivity (K) = 0.5 W/mK
Temperature difference (ΔT) = 60°C
Calculation:
Heat flow (Q) can be calculated using the formula:
Q = (K × A × ΔT) / L
Substituting the given values in the formula, we get:
Q = (0.5 × 1 × 60) / 0.25
Q = 120 W
Therefore, the heat flow through the plane wall is 120 W.
Answer: Option (a) 120 W.
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Community Answer
A plane wall is 25 cm thick with an area of 1 m2, and has a thermal co...
According to couriers law of thermal conduction
Q=KA(dT/dx)
on placing values you'll get answer
Q=KA(dT/dx)
on placing values you'll get answer
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A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK. If a temperature difference of 60°C is imposed across it, what is the heat flow?a)120Wb)140Wc)160Wd)180WCorrect answer is 'A'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK. If a temperature difference of 60°C is imposed across it, what is the heat flow?a)120Wb)140Wc)160Wd)180WCorrect answer is 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK. If a temperature difference of 60°C is imposed across it, what is the heat flow?a)120Wb)140Wc)160Wd)180WCorrect answer is 'A'. Can you explain this answer?.
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