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Three rods of the same dimensions have thermal conductivities 3k,2k and k. They are arranged as shown, with their ends at 100 C, 50 C, and 0 C. The temperature of their junction is
10
Sep
Three rods of the same dimensions have thermal conductivities 3k,2k and k. They are arranged as shown, with their ends at 100 C, 50 C, and 0 C. The temperature of their junction is 2k and k. They are arranged as shown 50 C and 0 C. The temperature of their junction is Three rods [...]
A and B are two points on a uniform metal ring whose centre is C. The angle ACB = θ. A and B are maintained at two different constant temperatures. When θ = 180°, the rate of total heat flow from A to B is 1.2 W. When θ = 90°, this rate will be
10
Sep
A and B are two points on a uniform metal ring whose centre is C. The angle ACB = θ. A and B are maintained at two different constant temperatures. When θ = 180°, the rate of total heat flow from A to B is 1.2 W. When θ = 90°, this rate will be [...]
Three rods A, B and C of the same length and cross- sectional area are joined in series as shown. The temperature at the junction of A and B, in equilibrium, is
10
Sep
Three rods A, B and C of the same length and cross- sectional area are joined in series as shown. The temperature at the junction of A and B, in equilibrium, is B and C of the same length and cross- sectional area are joined in series as shown. The temperature at the junction of [...]
A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature theta along the length x of the bar from its hot end is best described by which of the following figures?
10
Sep
A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature theta along the length x of the bar from its hot end is best described by which of the following figures? The temperature gradient in a rod of 0.5 m long is 80 [...]
A cylinder of radius R made of a material of thermal conductivity K_1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K_2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
10
Sep
A cylinder of radius R made of a material of thermal conductivity K_1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K_2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across [...]
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:
10
Sep
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 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: September 10, 2021 [...]
A slab consists of two layers of different materials of the same thickness and having thermal conductivities K1 and K2. The equivalent thermal conductivity of the slab is
10
Sep
A slab consists of two layers of different materials of the same thickness and having thermal conductivities K1 and K2. The equivalent thermal conductivity of the slab is A slab consists of two layers of different materials of the same thickness and having thermal conductivities K1 and K2. The equivalent thermal conductivity of the slab [...]
A glass window conducts out a certain quantity of heat per second when the inside temperature is 10 C and the outside temperature is – 10 C. The same quantity of heat will be conducted in through the window per second when the inside temperature is – 43C and the outside temperature is
10
Sep
A glass window conducts out a certain quantity of heat per second when the inside temperature is 10 C and the outside temperature is – 10 C. The same quantity of heat will be conducted in through the window per second when the inside temperature is – 43C and the outside temperature is The temperature [...]
One end of a thermally insulated copper rod of length 1 m long and of 10 cm^(2) in X-section is immersed in boiling water (100 C) and the other in ice (0 C) . If K_(Cu) = 0.92 cal/cm/s/C and L_(ice) = 80 cal/g, the ice that will melt per minute is
10
Sep
One end of a thermally insulated copper rod of length 1 m long and of 10 cm^(2) in X-section is immersed in boiling water (100 C) and the other in ice (0 C) . If K_(Cu) = 0.92 cal/cm/s/C and L_(ice) = 80 cal/g, the ice that will melt per minute is The temperature gradient [...]
Two vessels A and B of different materials are similar in shape and size. The same quantity of ice filled in them gets melted in time t1 and t2 respectively. The ratio of thermal conductivities of A and B is
10
Sep
Two vessels A and B of different materials are similar in shape and size. The same quantity of ice filled in them gets melted in time t1 and t2 respectively. The ratio of thermal conductivities of A and B is The temperature gradient in a rod of 0.5 m long is 80 C/m. If the [...]