Surface quality is affected due to Resistance strength of contact surfaces O Friction resistance of contact surfaces Strength of joint contact surfaces O Wear resistance of contact surfaces
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- What happens to heat transfer per unit time in conduction heat transfer as thermal conductivity decreases?The rate of heat conduction through a plane wall is proportional to the average thermal conductivity, the wall area, and the temperature difference, but is inversely proportional to the ---------------.Determine the resistance of an aluminium coil of 183 cm as diameter consists of 14500 turns and the mean length per turn is 4883 cm. Take the electrical conductivity of the aluminium coil as 0.37 MS/m. Solution: Area of Cross-section of the Coil (in m?) Total Length (in m) The Resistance of the Coil (in N)
- In a glass plant in Cavite, a furnace has fire-brick walls made up of the following two materials in series : Non-corrosive brick as inner layer (material 1) Clay brick as outer layer (material 2) Thickness 4.5 inches 8 inches Thermal conductivity k1 k2 The temperature inside the furnace (inside wall surface of the non-corrosive brick) is found to be 1105 oF while the outside temperature (outside wall surface of clay brick) is 365 oF. This is not the desired temperature inside the furnace so engineers thought of lagging the furnace walls with another material to reduce heat loss. The additional lagging material consists of magnesia layer which is 2 inches thick and has a thermal conductivity of 0.04 Btu /h.ft.oF. During a test run on the furnace with the magnesia lagging material now, new temperature readings were recorded : Point of measurement Temperature reading Inside furnace (inside wall surface of non-corrosive brick 1355 oF Interface between…Determine the resistance of an aluminium coil of 183 cm as diameter consists of 14500 turns and the mean length per turn is 4883 cm. Take the electrical conductivity of the aluminium coil as 0.37 MS/m. Solution: Area of Cross-section of the Coil (in m²) Total Length (in m) The Resistance of the Coil (in 2) o searchThe annual fixed costs for insulating a certain steam pipe installation can be expressed as Cf = 30S + 40 dollar per year where S is thickness of insulation in inches, and the annual cost of energy lost (annual direct costs) from the installation may be expressed in terms of the insulation thickness as Cp = 100/S $ per year. Determine the optimum annual insulation thickness cost.
- Energy transfer by conduction is primarily restricted to liquids fluids gases solids Which is correct?We performed the experiment to measure the thermal conductivity of 2 materials (Brass & Steel) in the laboratory and measured the following tabulated values: Material 1 - BRASS (Diameter = 25mm) Power Temperature (°C) Q' (W) 1 4 5 6 7 2 3 8. 9 14.7 79.1 77.6 75.9 50.2 46.4 42.4 36.1 34,4 33.5 Material 2 - STEEL (Diameter = 25mm) Power Temperature (°C) Q' (W) 1 2 3 7 8 9 14.25 88.5 87.4 84.9 34.1 33.4 32.4GChoose the right answer 1. The temperature profile for steady hest conduction through a plane wall of constant thermal conductivity is a. logarithmic b. parabolic 2. A brick wall (k-0.75 W/mK ) transmits $02 of heat loss through another wall (k-0.25 W/mK, x-100 mm). If the temperature difference across both walls is the same, the thickness of the brick wall would be a.150 mm c. linear 6T b. 240 mm c. 300 mm d. 375 mm 3. The maximum temperature at the center of the solid sphere of radius R having heat generation q (W/m') is given by g'R +9R b. T, + 4k T+9R 6k d. T+9R 8k a. 2k C. 4. The internal thermal resistance of a solid can be ignored if the Biot number is less than a. 1 b. 0.5 c. 0.1 d. Fourier number 5. The ratio of heat transfer of a fin to the heat transfer without fin is referred to as a. fin resistance b. fin efficieney efin effectiveness d. fin conductance.
- A manufacturer of loose-fill cellulose insulating material provides a table showing the relationship between the thickness of the material and its R-value. The manufacturer’s data is shown in the accompanying table. R -value (m2 ⋅K/W) Thickness (mm) R -40 275 R -32 225 R -24 162 R- 19 132 R -13 88 Calculate the thermal conductivity of the insulating material. Also, determine how thick the insulation should be to provide R-values of a. R-30 b. R-20 11.9ösly äbä With rise in temperature , the conductivity of the metals depending on temperature remains constant decreases Increases نقطة واحدة When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by conduction and convection radiation conduction convection نقطة واحدة Thermal diffusivity of a : substance is-A per fectly sealed room metors height 10 meters wide, 12 meter? long and 3 Is composed of 49 shudonts and I pro fessor- The piesore and temperature of I atm and o deg C. respechiuely. If a person occopics an averange room has an initial Volume of D-20 ecubic meter and gjuel off 678 kj per nour of heat, what woud be the temperatore of the room af ter 10 mins ! Usc moleculor mass of air M equal to 28.9 kg/mol, specific heat of cir af constant volume Cv cqual to 0.718b HT/kq-k Cand gav constant R eaual to 0.117 k5/kg-u