Heat-transfer Questions Set 17:
Which parameter is not present in the unit of thermal conductivity?
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Which of the following are mechanisms of heat transfer?
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The process of heat transfer by molecular collision is known as:
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Which of the following is correct for a black body?
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Which of the following does the convective heat transfer coefficient not depend on?
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The heat transfer from the finned surface is 0.0023 W and the heat transfer from the un-finned surface is 0.32 W. Determine the total heat transferred.
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If there are three resistors connected in parallel - R1 = 0.25 K/W, R2 = 0.45 K/W, R3 = 0.65 K/W, what is the total thermal resistance offered by the three resistors?
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Of the radiant energy 350 W/m² incident upon a surface, 250 W/m² is absorbed, 60 W/m² is reflected, and the remainder is transmitted through the surface. Calculate the value for the reflectivity of the surface material.
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Three fins of equal length and diameter, made of aluminum, brass, and cast iron, are heated to 200 degrees Celsius at one end. If the fins dissipate heat to the surrounding air at 25 degrees Celsius, the temperature at the free end will be least in the:
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A tube with an inside diameter of 3 cm and a length of 30 cm has a heating wire installed along its axis. The wire has a diameter of 2 mm and carries a current of 0.6 Amperes when subjected to a potential difference of 5 Volts. The wire surface temperature and tube wall temperature are measured by thermocouples as 180°C and 130°C respectively. What is the thermal conductivity of the medium filled in the tube?
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