Part 1
A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends of wall is 36 C. Then the difference of temperature at the two surfaces of A will be
10
Sep
A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends of wall is 36 C. Then the difference of temperature [...]
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A wall is made up of two layers A and B. The thickness of the two layers is the same ,
then the ratio of heats conducted by them in a given time will be : ,
Two rods of the same material have diameters in the ratio 1:2 and the lengths in the ratio of 2:1. If the temperature difference between their ends is the same ,
Three rods of same dimensions are arranged as shown in figure. They have thermal conductivities K1 , K2 and K3 . The points P and Q are maintained at different temperatures for the heat to flow at the same rate along PRQ and PQ. Which of the following option is correct?
10
Sep
Three rods of same dimensions are arranged as shown in figure. They have thermal conductivities K1 , K2 and K3 . The points P and Q are maintained at different temperatures for the heat to flow at the same rate along PRQ and PQ. Which of the following option is correct? K2 and [...]
Consider the situation as shown in fig. Calculate the amount of heat flowing per second through a cross section of the bent part, if the total heat taken out per second from the end at 100 C is 130 J.
10
Sep
Consider the situation as shown in fig. Calculate the amount of heat flowing per second through a cross section of the bent part, if the total heat taken out per second from the end at 100 C is 130 J. Consider the situation as shown in fig. Calculate the amount of heat flowing per second [...]
A rod of thermal resistance 5 K/W is joined at middle of an identical rod AB as shows. The temperature of C and heat current in CD will be
10
Sep
A rod of thermal resistance 5 K/W is joined at middle of an identical rod AB as shows. The temperature of C and heat current in CD will be A rod of thermal resistance 5 K/W is joined at middle of an identical rod AB as shows. The temperature of C and heat current in [...]
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 [...]