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A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?
[2011]
- a)The outer radius of the pipe is equal to the critical radius.
- b)The outer radius of the pipe is less than the critical radius.
- c)Adding the insulation will reduce the heat loss.
- d)Adding the insulation will increase the heat loss.
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A pipe of 25 mm outer diameter carries steam. The heat transfer coeffi...
Critical radius of insulation = (k/h)
= 10mm
(router) > rcritical
Thus, adding insulation shall decrease H.T. Rate.
= 10mm(router) > rcritical
Thus, adding insulation shall decrease H.T. Rate.
Most Upvoted Answer
A pipe of 25 mm outer diameter carries steam. The heat transfer coeffi...
Solution:
Given data:
Outer diameter of the pipe, d = 25 mm = 0.025 m
Heat transfer coefficient, h = 5 W/m²K
Thermal conductivity of insulation, k = 0.05 W/mK
Critical radius is the radius at which the heat loss through the cylinder is minimum. It is given by:
rc = k/h
rc = 0.05/5
rc = 0.01 m
Outer radius of the pipe, ro = d/2 = 0.025/2 = 0.0125 m
As ro < rc,="" the="" outer="" radius="" of="" the="" pipe="" is="" less="" than="" the="" critical="" />
Now, on adding insulation, the heat loss from the pipe can be reduced. This is because the insulation reduces the rate of heat transfer from the surface of the pipe to the surroundings. Hence, adding insulation will reduce the heat loss.
Therefore, option (C) is the correct answer.
Summary:
The outer radius of the pipe is less than the critical radius. Adding insulation will reduce the heat loss.
Given data:
Outer diameter of the pipe, d = 25 mm = 0.025 m
Heat transfer coefficient, h = 5 W/m²K
Thermal conductivity of insulation, k = 0.05 W/mK
Critical radius is the radius at which the heat loss through the cylinder is minimum. It is given by:
rc = k/h
rc = 0.05/5
rc = 0.01 m
Outer radius of the pipe, ro = d/2 = 0.025/2 = 0.0125 m
As ro < rc,="" the="" outer="" radius="" of="" the="" pipe="" is="" less="" than="" the="" critical="" />
Now, on adding insulation, the heat loss from the pipe can be reduced. This is because the insulation reduces the rate of heat transfer from the surface of the pipe to the surroundings. Hence, adding insulation will reduce the heat loss.
Therefore, option (C) is the correct answer.
Summary:
The outer radius of the pipe is less than the critical radius. Adding insulation will reduce the heat loss.
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A pipe of 25 mm outer diameter carries steam. The heat transfer coeffi...
Answer is C
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A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer?
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A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. 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 A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. 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 A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer?.
A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. 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 A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. 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 A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer?.
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A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?[2011]a)The outer radius of the pipe is equal to the critical radius.b)The outer radius of the pipe is less than the critical radius.c)Adding the insulation will reduce the heat loss.d)Adding the insulation will increase the heat loss.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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