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Home Question Bank Engineering Archive 2025 January 11

Engineering Questions from Jan 11,2025

Browse the Engineering Q&A Archive for Jan 11,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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The allowable shear stress of a weld is \( 25 \% \) of the nominal tensile strength of the weld metal. If the nominal tensile strength is 62,000 psi, what is the allowable shear stress? The allowable shear stress is \( \square \) psi. (Simplity your answer.) If the alternator-to-engine drive ratio is 2.55 to 1 , what rpm will the alternator have when the engine is idling at 400 rpm ? Hint. Use a direct proportion. The alternator will have \( \square \mathrm{rpm} \) when the engine is idling at 400 rpm . (Type a whole number or a decimal.) In the opposite figure : The sum of the moments of the two forces about D is ... N.m \( \begin{array}{ll}\text { a) } 30 & \text { b) } 50 \\ \text { c) } 60 & \text { d) } 40\end{array} \) A line shaft rotating at 250 rpm is connected to a grinding wheel by the pulley assembly shown. If the grinder shaft must turn at 1050 rpm , what size pulley should be attached to the line shaft? If the grinder shaft must turn at 1050 rpm, a 1.43 in. pulley should be attached to the line shaft. Aline shaft rotating at 250 rpm is connected to a grinding wheel by the pulley assembly shown. If the grinder shaft must turn at 1050 rpm , what size pulley should be attached to the line shaft? If the grinder shaft must turn at 1050 rpm, a \( \square \) in. pulley should be attached to the line shaft. 66 Um gás contido em um sistema pistão-cilindro é submetido a um processo com a relação entre pressão e volume especifico \( p \mathrm{y}^{1,2}= \) constante. A massa do gás é \( 0,4 \mathrm{lb}(0,18 \mathrm{~kg}) \) e os seguintes dados são conhecidos: \( p_{1}=160 \mathrm{lbf} / \mathrm{m}^{2}(113,16 \mathrm{kPa}), V_{1}= \) \( 1 \mathrm{ft}^{3}(28,32 \mathrm{~L}), p_{2}=390 \mathrm{lbf} / \mathrm{in}^{2}(2688,96 \mathrm{kPa}) \). Durante o processo, a transferência de calor do gás é \( 2,1 \mathrm{Btu}(2,22 \mathrm{~kJ}) \). Desconsidere as variações de energia cinética e potencial e determine a variação de energia interna especifica do gás, em Btu/lb. Um gás contido em um sistema pistão-cilindro é submetido a um processo com a relação entre pressão e volume específ \( p \mathrm{y}^{1,2}= \) constante. A massa do gás é \( 0,4 \mathrm{lb}(0,18 \mathrm{~kg}) \) e os seguintes dados são conhecidos: \( p_{1}=160 \mathrm{lbf} / \mathrm{in}^{2}(113,16 \mathrm{kPa}), \mathrm{V} \) \( 1 \mathrm{ft}^{3}(28,32 \mathrm{~L}), p_{2}=390 \mathrm{lbf} / \mathrm{in}^{2}(2688,96 \mathrm{kPa}) \). Durante o processo, a transferência de calor do gás é \( 2,1 \mathrm{Btu}(2,22 \mathrm{l} \) Desconsidere as variações de energia cinética e potencial e determine a variação de energia interna específica do gás, \( \mathrm{Btu} / \mathrm{lb} \).
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