The line at which the tunnel wall breaks from sloping outward can be given as

Related MCQs

• A composite wall is made of two layers of thickness δ1 and δ2 having thermal conductivities k and 2k and equal surface area normal to the direction of heat flow. The outer surface of composite wall are at 100 degree Celsius and 200 degree Celsius. The minimum surface temperature at the junction is 150 degree Celsius. What will be the ratio of wall thickness?
• Which of the following should be considered while aligning a tunnel?
• Among the following, which doesn’t belong to tunnel classification?
• The transfer of heat between a wall and a fluid system in motion is called
• A large heat exchanger transfers a total of 100 MW. Assume the wall separating steam and seawater is 4 mm of steel, conductivity 15 W/m K and that a maximum of 5°C difference between the two fluids is allowed. Find the required minimum area for the heat transfer.
• A composite wall generally consists of
• A composite wall of a furnace has two layers of equal thickness having thermal conductivities in the ratio 2:3. What is the ratio of the temperature drop across the two layers?
• According to the Indian Standards, it is recommended that thermal damping of a wall should not be less than                
• According to Indian Standards, overall thermal transmittance of a wall should not be more than                      kcal/m2 h deg C.
• The particle loses energy when it collides with the wall.