Multiple choice

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

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

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

  3. Adding the insulation will reduce the heat loss.

  4. Adding the insulation will increase the heat loss.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Keep practicing — related questions