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Home Question Bank Engineering Archive 2025 January 20

Engineering Questions from Jan 20,2025

Browse the Engineering Q&A Archive for Jan 20,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Target Writing Level: Advanced Write a claim, evidence, reasoning statement to answer the question below based on the measurements and observations recorded during testing. Data regaruing the materials and recorded temperatures is given below. Question: Does the prototype oven successfully accomplish the goal and fit within the constraints of the engineering challenge? The constraints include a cost of less than \$10, most or all materials to be reusable or recyclable and for the water temperature to increase by at least 10 ©C. ec. Which of the following is NOT listed as a parameter of this engineering design challenge? The materials must be reusable or recyclable. The materials must include aluminum foil. The temperature must increase by at least \( 10^{\circ} \mathrm{C} \). All materials must cost less than \( \$ 10 \). What is the purpose of this engineering design challenge? To design a cleaner burning woodigrill. To design a more efficient natural gas stove. To design a more sustainable and environmentally friendly cooking method. The allowable shear stress of a weld is \( 25 \% \) of the nominal lensile strength of the weld metal if the nominal lensile strength is 66 ,000 psi, what is the allowable shear stress? The base of the flange shown in the drawing is actually 16 in . Its drawing width is 5 in . (a) What will be the actual dimension A if A is 3.75 in . on the drawing? (b) Find the scale factor of the drawing. A 30 -tooth gear on a motor shaft drives a larger gear having 66 teeth. If the motor shaft rotates at 1100 rpm , what is the speed of the larger gear? 36.A truss hinged at one end, supported on rollers at the other, is subjected to the horizontals load only. It's reaction at the hinged end will be A) horizontal B) vertical C) resultant of horizontal and vertical \( 9-50 \) A \( 10-\mathrm{m} \)-long section of a \( 6-\mathrm{cm} \)-diameter horizontal hot- water pipe passes through a large room whose temperature is \( 27^{\circ} \mathrm{C} \). If the temperature and the emissivity of the outer surface of the pipe are \( 73^{\circ} \mathrm{C} \) and 0.8 , respectively, determine the rate of heat loss from the pipe by \( (a) \) natural convection and \( (b) \) radiation. \( 9-12 \) A \( 10 \mathrm{~cm} \times 10 \mathrm{~cm} \) plate has a constant surface tempera- ture of \( 150^{\circ} \mathrm{C} \). Determine the Grashof number if the chip is placed in the following fluids: air \( \left(1 \mathrm{~atm}, 30^{\circ} \mathrm{C}\right) \), liquid water \( \left(30^{\circ} \mathrm{C}\right) \), engine oil \( \left(10^{\circ} \mathrm{C}\right) \). Discuss how the Grashof number affects the natural convection flow. An electrical circuit has a insulation made of XLPE. What is the correction factor for ambient temperature (Ca) when it is laid in conduit through an area with ambient temperature at \( 40^{\circ} \mathrm{C} \) ?
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