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Home Question Bank Engineering Archive 2025 January 13

Engineering Questions from Jan 13,2025

Browse the Engineering Q&A Archive for Jan 13,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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If the alternator-to-engine drive ratio is 2.65 to 1 , what rpm will the alternator have when the engine is idling at 300 rpm ? Hint: Use a direct proportion. The alternator will have \( \square \mathrm{rpm} \) when the engine is idling at 300 rpm . (Type a whole number or a decimal.) U6 Das Messsignal der EMSR-Stelle 402 wird in ein Einheitssignal ( 0 mA bis 20 mA ) umgewandelt. Berechnen Sie das Einheitssignal \( I_{\mathrm{E}} \) des Transmitters (in mA ) bei einer Temperatur von \( \vartheta=165{ }^{\circ} \mathrm{C} \), wenn der Mess- bereich \( \vartheta_{1}=20,0^{\circ} \mathrm{C} \) bis \( \vartheta_{2}=300^{\circ} \mathrm{C} \) beträgt. ( 10 Pkte.) Question 5 ( \( \mathbf{2 5} \) point) Refrigerant 134 a enters a compressor and a negligible velocity. The refrigerant enters the compressor as a saturated vapor at \( 12^{\circ} \mathrm{C} \) and leaves the compressor at 1400 kPa with an enthalpy of \( 281.4 \mathrm{~kJ} / \mathrm{kg} \) and a velocity of \( 50 \mathrm{~m} / \mathrm{s} \). The rate of work done on the refrigerant is measured to be \( 27.3 \mathrm{~kJ} / \mathrm{kg} \). If the diameter at the exit is equal to 4.6 cm , determine the rate of heat transfer associated with this process, in kW . Note: Don't do interpolation, take the closest value Question 1 (10 point) A 350000 L rigid tank is filled with saturated liquid-vapor mixture of water at 250 kPa . If 35 percent of the mass is liquid and 65 percent of the mass is vapor, what is the total mass in the tank? Question \( 2\left(20\right. \) point) Two air flows are combined to a single flow. One flow is \( 1 \mathrm{~m}^{3} / \mathrm{s} \mathrm{at} 200^{\circ} \mathrm{C} \), and the other is \( 2 \mathrm{~m}^{3} / \mathrm{s} \) at \( 200^{\circ} \mathrm{C} \), both at 100 kPa . They mix without any heat transfer to produce an exit flow at 100 kPa . Neglect kinetic energies and find the volume flow rate at the exit. Assuming constant specific heat Q4. Question: A soil sample has: - Total weight \( (\mathrm{W})=5 \mathrm{~kg} \) - Volume \( (\mathrm{V})=0.003 \mathrm{~m}^{3} \) - Volume of voids \( (\mathrm{Vv})=0.0008 \mathrm{~m}^{3} \) - Weight of water \( (\mathrm{Mw})=0.6 \mathrm{~kg} \) - Dry weight \( (\mathrm{Ms})=4.4 \mathrm{~kg} \) Tasks: 1. Calculate the density. 2. Calculate the unit weight. 3. Calculate the porosity. 4. Calculate the void ratio. Q1. Discuss in details soil sampling Q2. Explain in details the procedures of conducting the following test: a) Sieve analysis test b) Moisture content test c) Compaction test d) Hydrometer test e) Atterberg limit test Q3. Explain in details the reasons of conducting soil test Q6. A soil sample has the following properties: - Mass of soil sample (M): 4.5 kg - Total volume (V): \( 0.0025 \mathrm{~m}^{3} \) - Volume of solids \( (\mathrm{Vs}): 0.0019 \mathrm{~m}^{3} \) - Mass of water (Mw): 0.7 kg Tasks: 1. Calculate the density. 2. Calculate the unit weight. 3. Calculate the porosity (n). 4. Calculate the void ratio (e). Q5. A construction site has a soil sample with the following details: - Wet weight of the sample (Wwet): 6.2 kg - Dry weight (Wdry): 5.3 kg - Total volume \( (\mathrm{V}): 0.004 \mathrm{~m}^{3} \) - Volume of solids \( (\mathrm{Vs}): 0.003 \mathrm{~m}^{3} \) Tasks: 1. Calculate the density of the wet sample. 2. Calculate the unit weight of the wet sample. 3. Calculate the porosity \( (\mathrm{n}) \). Q5. A construction site has a soil sample with the following details: - Wet weight of the sample (Wwet): 6.2 kg - Dry weight (Wdry): 5.3 kg - Votal volume (V): \( 0.004 \mathrm{~m}^{3} \) Tasks: 1. Calculate the density of the wetids (Vs): \( 0.003 \mathrm{~m}^{3} \) 2. Calculate the unit weight of the wet sample. 3. Calculate the porosity (n). ¿Qué método se utiliza para determirfar la distribución del esfuerzo resultante?
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