A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m 2 K . 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?

Correct Answer is : Adding the insulation will reduce the heat loss

The outer radius of the pipe is equal to the critical radius

The outer radius of the pipe is less than the critical radius

Adding the insulation will reduce the heat loss

Adding the insulation will increase the heat loss

GATE Mechanical Engineering(ME) 2011 Solved Paper

Question : 25 of 65

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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?

The outer radius of the pipe is equal to the critical radius
The outer radius of the pipe is less than the critical radius
Adding the insulation will reduce the heat loss
Adding the insulation will increase the heat loss

Validate

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