Find the heat current through the frustum of a cone shown in figure-4.20. Temperature of its two ends are maintained at `T_(1)` and `T_(2)`(T_(2)>T_(1))` respectively and the thermal conductivity of the material is k.

A hollow tube has a length l, inner radius R_(1) and outer radius R_(2) . The material has a thermal conductivity K. Find the heat flowing through the walls of the tube if (a) the flat ends are maintained at temperature T_(1) and T_(2) (T_(2)gtT_(1) (b) the inside of the tube is maintained at temperature T_(1) and the outside is maintained at T_(2) .

A hollow tube has a length l, inner radius R_(1) and outer radius R_(2) . The material has a thermal conductivity K. Find the heat flowing through the walls of the tube if (a) the flat ends are maintained at temperature T_(1) and T_(2) (T_(2)gtT_(1)) (b) the inside of the tube is maintained at temperature T_(1) and the outside is maintained at T_(2) .

A hollow tube has a length l, inner radius R_(1) and outer radius R_(2) . The material has a thermal conductivity K. Find the heat flowing through the walls of the tube if (a) the flat ends are maintained at temperature T_(1) and T_(2) (T_(2)gtT_(1)) (b) the inside of the tube is maintained at temperature T_(1) and the outside is maintained at T_(2) .

A thick cylindrical shell made of material of thermal conductivity k has inner and outer radii r and R respectively and its length is L. When the curved surface of the cylinder are lagged (i.e., given insulation cover) and one end is maintained at temperature T_(1) and the other end is maintained at T_(2)(lt T_(1)) , the heat current along the length of the cylinder is H. In another experiment the two ends are lagged and the inner wall and outer wall are maintained at T_(1) and T_(2) respectively. Find the radial heat flow in this case.

Consider two rods of equal cross - sectionai area A, one of Aluminium and other of iron joined end to end as shown in figure -4.8. Length of the two rods and their thermal coductivities are l_(1) , k_(1) and l_(2),k_(2) respectively . If the ends of the rods are maintained at temperature T_(1) and T_(2),(T_(1)gt T_(2)) find the temperature of the junction in steady state .

Three rods AB, BC and BD having thermal conductivities in the ratio 1:2:3and length in the ratio 2:1:1 are joined as shown in figure . The ends A , C and D are at temperature T_(1), T_(2) and T_(3) respectively . Find the temperature of the junction B . Assume steady state .

A composite cylinder is made of two materials having thermal conductivities K_(1) and K_(2) as shown. Temperature of the two flat faces of cylinder are maintained at T_(1) and T_(2) . For what ratio K_(1)//K_(2) the heat current throught the two materials will be same. Assume steady state and the rod is lagged (insulated from the curved surface).

A slab of cunductivity k is in the shape of trapezoid as shown I figure. If the two end faces be maintained at temperature T_(1)=50^(@)C and T_(2)=25^(@)C , then determine the thermal current through the slab by ignoring any heat loss through the lateral surfaces. .

A slab of cunductivity k is in the shape of trapezoid as shown I figure. If the two end faces be maintained at temperature T_(1)=50^(@)C and T_(2)=25^(@)C , then determine the thermal current through the slab by ignoring any heat loss through the lateral surfaces. .