Thermal Propert...

A, B and C are three identical conductors but made from different materials. They are kept in contact as shown. Their thermal conductivites are k, 2k and k/2. The fee and of A is at 100^oC and the free end of C is 0^oC. During steady state, the temperature of the junction of A and B is nearly

A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K) and sizes (given in terms of length L) as shown in the figure. All slabs are of same width. Heat Q flows only from left to right through the blocks. Then, in steady state

Three identical rods A, B and C are placed end to end. A temperature difference is maintained between the free ends of A and C. The thermal conductivity of B is thrice that of C and half of that of A. The effective thermal conductivity of the system will be (K_A is the thermal conductivity of rod A)

1.56 × 10⁵ J of heat is conducted through is 2 m² wall of 12 cm thick in one hour. Temperature difference between the two sides of the wall is 20°C. The thermal conductivity of the material of the wall is (in Wm^-1 K^-1)

A long metallic bar is carrying heat from one of its ends to the other end under steady-state.The variation of temperature 0 along the length x of the bar from its hot end is best described by which of the following figure?

Two rods of equal lengths and areas of cross-section are kept parallel and hanged between temperatures 20°C and 80°C.The ratio of the effective thermal conductivity to that of the first rod is

For an opaque body, coefficient of transmission is

Two rods of the same length and diameter having thermal conductivities K₁ and K₂ are joined in parallel. The equivalent thermal conductivity of the combination is

Two slabs A and B of equal surface area are placed one over the other such that their surfaces are completely in contact. The thickness of slab A is twice that of B. The coefficient of thermal conductivity of slab A is twice that of B. The first surface of slab A is maintained at 100°C, while the second surface of slab B is maintained at 25°C. The temperature at the contact of their surfaces is

Which of the following circular rods (given radius r and length I), each made of the same material as whose ends are maintained at the same temperature will conduct most heat?