GATE ME topic:heat-transfer PYQs & Answers — Page 6

Questions 51–60 of 62. Imported answers require independent review unless marked reviewed.

Topic practice 62 questionsPage 6 of 7

Three slabs are joined together as shown in the figure. There is no thermal contact resistance at the interfaces. The center slab experiences a non-uniform internal heat generation with an average value equal to 1000 Wm

, while the left and right slabs have no internal heat generation. All slabs have thickness equal to 1 m and thermal conductivity of each slab is equal to 5 Wm

. The two extreme faces are exposed to fluid with heat transfer coefficient 100 Wm

and bulk temperature 30 °C as shown. The heat transfer in the slabs is assumed to be one dimensional and steady, and all properties are constant. If the left extreme face temperature

is measured to be 10 °C, the right extreme face temperature

is ______ °C.

Diagram for Mechanical Engineering question 47

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The peak wavelength of radiation emitted by a black body at a temperature of 200 K is 1.45

m. If the peak wavelength of emitted radiation changes to 2.90

m, then the temperature (in K) of the black body is

Your answerChoose one option.

500

1000

400

800

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A 0.2 m thick infinite black plate having a thermal conductivity of 3.96 W/m-K is exposed to infinite black surfaces at 300 K and 400 K as shown in the figure. At steady state, the surface temperature of the plate facing the cold side is 350 K. The value of Stefan-Boltzmann constant,

, is

W/m

. Assuming 1-D heat conduction, the magnitude of heat flux through the plate (in W/m

) is ________ (correct to two decimal places).

Diagram for Mechanical Engineering question 41

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A plane slab of thickness L and thermal conductivity k is heated with a fluid on one side (P), and the other side (Q) is maintained at a constant temperature, T

of 25°C, as shown in the figure. The fluid is at 45°C and the surface heat transfer coefficient, h, is 10 W/m

K. The steady state temperature, T

, (in °C) of the side which is exposed to the fluid is ______ (correct to two decimal places).

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Steam in the condenser of a thermal power plant is to be condensed at a temperature of 30°C with cooling water which enters the tubes of the condenser at 14°C and exits at 22°C. The total surface area of the tubes is 50 m², and the overall heat transfer coefficient is 200 W/m² K. The heat transfer (in MW) to the condenser is ______ (correct to two decimal places).

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Saturated steam at 100°C condenses on the outside of a tube. Cold fluid enters the tube at 20 °C and exits at 50 °C. The value of the Log Mean Temperature Difference (LMTD) is ______ °C.

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The heat loss from a fin is 6 W. The effectiveness and efficiency of the fin are 3 and 0.75, respectively. The heat loss (in W) from the fin, keeping the entire fin surface at base temperature, is ____________

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The emissive power of a blackbody is

. If its absolute temperature is doubled, the emissive power becomes

Your answerChoose one option.

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Two black surfaces, AB and BC, of lengths 5 m and 6 m, respectively, are oriented as shown. Both surfaces extend infinitely into the third dimension. Given that view factor

and Stefan Boltzmann constant,

W/(m

), the heat transfer rate from Surface 2 to the surrounding environment is ________ kW.

Diagram for Mechanical Engineering question 37

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Heat is generated uniformly in a long solid cylindrical rod (diameter = 10 mm) at the rate of

W/m³. The thermal conductivity of the rod material is 25 W/m.K. Under steady state conditions, the temperature difference between the centre and the surface of the rod is __________ °C.

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GATE ME topic:heat-transfer PYQs

Question 47

Question 9

Question 41

Question 47

Question 54

Question 10

Question 18

Question 19

Question 37

Question 38