Engineering Questions from Jan 10,2025

Browse the Engineering Q&A Archive for Jan 10,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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77 Um gás em um conjunto cilindro-pistão percorre um ciclo termodinâmico composto por três processos em série, iniciand no estado 1 , em que \( p_{1}=1 \mathrm{bar}, V_{1}=1,5 \mathrm{~m}^{3} \), como a seguir: rocesso 1-2:Compressão com \( p V= \) constante, \( W_{12}=-104 \mathrm{~kJ}, U_{1}=512 \mathrm{~kJ}, U_{2}=690 \mathrm{~kJ} \). rocesso 2-3: \( W_{23}=0, Q_{23}=150 \mathrm{~kJ} \). rocesso 3-1: \( W_{31}=+50 \mathrm{kJ} \). Não há variações na energia cinética ou potencial. (a) Determine \( Q_{12}, Q_{31} \), e \( U_{3} \), todos em kJ . (b) Esse ciclo pode ser de potência? Explique. 9 Multiple Choice 1 point What must happen prior to commencing work on a pneumatic system? ensure system is de-energized, locked out and tagged ensure system is energized, in order to diagnose leaks ensure the system remains on-line for production shut the entire building down to prevent back feed of compressed air 6. Multiple Choice 1 point A pneumatic air line should always have what component plumbed in-line to prevent full flow condition, if a hose break should occur? Air-Fuse Check Valve FRL Directional Control Valve Multiple Choice 1 point Once you have pneumatically isolated a jammed actuator, what is the next step to "ZERO ENERGY STATE Bleed air from jammed component Remove jammed component Fix jammed component in place Increase working pressure to push through jam A rectangular concrete channel 6 m wide, on a \( 2.5 \% \) slope, is discharging \( 11.3 \mathrm{~m}^{3} / \mathrm{s} \) into a stilling basin. The basin, also 6 m wide, has a water depth of 2.4 m determined from the downstream channel condition. \( \checkmark \) Design the stilling basin (determine width and type of structure). 5. A vertical point load of 250 kN is applied at the surface of a homogeneous, elastic soil mass. The point load is located at a depth of 6 meters. Calculate the vertical stress at a depth of 6 meters directly beneath the point load and at a horizontal distance of 4 meters away from the point load. 4. A soi-layer is fully saturated with a unit weight of \( 20 \mathrm{kN} / \mathrm{m}^{3} \) and a water table located 1 m below the surface. Calculate the total stress ( \( \sigma \) ), pore water pressure (u), and effective stress ( \( \sigma^{\prime} \) ) at depths of: a) 1 m b) 3 m c) 5 m (i) Design a non-inverting amplifier having a gain of 50 . Draw the circuit [ 4 pts .] and indicate the value of any components used [ 4 pts .]. (Use resistor values between \( 1 \mathrm{k} \Omega \) and \( 500 \mathrm{k} \Omega \).) An 16 An electric motor operates at 1000 rpm and displaces a piston of a hydraulic pump by \( 200 \mathrm{~cm}^{3} \) per revolution. Oil then starts flowing from a hydraulic pump through a pipe of diameter 25 mm . Oil has a kinematic viscosity of 70 cSt at \( 40^{\circ} \mathrm{C} \). a) Calculate the flow rate \( Q \) in \( \mathrm{m}^{3} / \mathrm{s} \). ( 1 mark) b) Calculate the oil velocity ( \( \mathrm{m} / \mathrm{s} \) ) in the pipe and decide where it is flowing (intake/return/ pressure). ( 2 marks) c) Calculate the Reynold's number and decide the type of flow in the pipe. ( 2 marks) An electric motor operates at 1000 rpm and displaces a piston of a hydraulic pump by \( 200 \mathrm{~cm}^{3} \) per revolution. Oil then starts flowing from a hydraulic pump through a pipe of diameter 25 mm . Oil has a kinematic viscosity of 70 cSt at \( 40^{\circ} \mathrm{C} \). a) Calculate the flow rate \( Q \mathrm{in} \mathrm{m}^{3} / \mathrm{s} \). ( 1 mark ) b) Calculate the oil velocity ( \( \mathrm{m} / \mathrm{s} \) ) in the pipe and decide where it is flowing (intake/ return/ pressure). ( 2 marks ) c) Calculate the Reynold's number and decide the type of flow in the pipe. ( 2 marks)
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