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GATE ME: Heat Transfer Champion Quiz 1

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Question 1

As the temperature increases, the thermal conductivity of a gas

Question 2

In a case of one dimensional heat conduction in a medium with constant properties, T is the temperature at position x, at time t. then $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2005_files\image029.png$ is proportional to

Question 3

In Steady State heat tranfer

Question 4

Consider one-dimensional steady state heat conduction, without heat generation, in a plane wall; with boundary conditions as shown in the figure below. The conductivity of the wall is given by k = k₀ + bT; where k₀ and b are positive constants, and T is temperature.

As x increases, the temperature gradient (dT/dx)will

Question 5

Steady one-dimensional heat conduction takes place across the faces 1 and 3 of a composite slab consisting of slabs A and B in perfect contact as shown in the figure, where k_A, k_B denote the respective thermal conductivities. Using the data as given in the figure, the interface temperature T₂ (in ^oC. is ____

Question 6

A mild steel tank of wall thickness 12 mm contains water at 100 °C. The atmospheric temperature is 20 °C. The thermal conductivity of mild steel is 50 W/mK, and the heat transfer co-efficients for inside and outside the tank are 2850 and 10 W/m² K, respectively. Calculate the rate of heat loss per m of tank surface .

Question 7

A plane wall is 25 cm thick with an area of 1 m², and has a thermal conductivity of 0.5 W/mK.If a temperature difference of 60⁰ C is imposed across it, what is the heat flow?

Question 8

A sphere, a cube and a thin circular plate, all made of same material and having same mass are initially heated to a temperature of 250⁰ C and then left in air at room temperature for cooling. Then which one of the following is correct?

Question 9

If thermal conductivity of a material varies as

, temperature at the center of a 10 cm thick wall of material will be

Question 10

What will be the heat transfer rate through the slab as shown, if Q, T1 and T2 are given?

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ESE & GATE ME Heat Transfer

Oct 6ESE & GATE ME