The reciprocal of thermal conductivity is known as                      

Related MCQs

• Which of the following is the correct relationship between thermal resistance and thermal conductivity?
• Presence of moisture in the thermal insulating material increases thermal insulation while the presence of air spaces decreases thermal insulation.
• Thermal conductivity is defined as the heat flow per unit time
• Mark the matter with least value of thermal conductivity
• Which one of the following forms of water have the highest value of thermal conductivity?
• Which of the following is the correct relation between thermal transmittance and thermal time constant?
• Surface resistance is the reciprocal of
• The sun shines on a 150 m2 road surface so it is at 45°C. Below the 5cm thick asphalt(average conductivity of 0.06 W/m K), is a layer of rubbles at 15°C. Find the rate of
• A water-heater is covered with insulation boards over a total surface area of 3 m2. The inside board surface is at 75°C and the outside being at 20°C and the conductivity of material being 0.08 W/m K. Find the thickness of board to limit the heat transfer loss to 200 W ?
• 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.