Mechanical Engineering question and answers for July 30, 2023
- Q A low-carbon steel plate is 270 mm wide and 25 mm thick. It isreduced in one pass in a two‑high rolling mill to a thickness of 20mm. Roll radius =...
- Q A steel alloy specimen having a rectangular cross section ofdimensions 19.1 mm × 3.0 mm (0.7520 in. × 0.1181 in.) has thestress-strain behavior shown in the Animated Figure 6.22. If...
- Q Solve the following set of equations with LU factorization withpivoting:3x1 -2x2 + x3 = -102x1 + 6x2- 4x3 = 44-8x1 -2x2 + 5x3 = -26Please show all steps
- Q Aluminum fins of triangular profile are attached to a plane wallwhose surface temperature is 100°C. The fin base thickness is 2.0mm, and its length is 10 mm. The system is...
- Q A brick wall 25cm thick, initially at 80°C has a medium at 15°Csuddenly placed in conatct with both of its surfaces through a heattransfer coefficient of 90W/m2°C. Find the temperature...
- Q The San Bruno pipeline explosion (the case in our first lecture)occurred at 6:11 pm PDT on September 9, 2010, in San Bruno,California, a suburb of San Francisco, when a 30-inch...
- Q Determine the rate of convection heat loss from both the top andthe bottom of a flat plate at Ts = 80°C with airin parallel flow at T? = 25°C, u?...
- Q Approximately spherical particles of diameter 150? and density2650 kg/m3 settle through a liquid of density 1097 kg/m3 anddynamic viscosity 3.8 mPa s. The volume fraction of particles is30% in a...
- Q 10 kg of steam is contained at 10 bar in a rigid vessel ofvolume 2.275 m3. The vessel is cooled until the pressurein the vessel is 7 bar. Calculate the...
- Q A spring with a mass of 1 kg has damping constant 10 kg/s and aspring constant 41 kg/s2 . If the spring begins at equilibriumposition and is given a velocity...
- Q 500 g of saturated liquid water is contained in apiston-cylinder arrangement. The inside diameter of the cylinder is100 mm. The water is heated at a constant pressure of 150 kPa...
- Q Octane is to be pumped in a piping system that is routed fromstorage tanks to the main pump by a number of smaller pumps. Onesuch arrangement is shown below. This...
- Q how to do the mechanical design of gas liquid ( flash)separator??what are the equations used for its mechanical design???
- Q Nitrogen is stored in a large chamber under conditions of 450 Kand 1.5x10^5 N/m^2. The gas leaves the chamber through aconverging-only nozzle whose outlet area is 30 cm^2. The ambientroom...
- Q A six-cylinder engine uses pushrods to actuate the valves. Thepushrods are 8.0 mm in diameter and are 650 mm long. Suppose thetemperature can change from -40oC to 116 oC.If the...
- Q CommasInsert commas where necessary in the following sentences.Some sentences, however, may not require commas.1. Well how are we going to handle this?2. To avoid any misunderstandings it is important to...
- Q An air-conditioned zone is at 72°F and 40% relative humidity.The total heating load of the space is 300,000 Btu/hr, out of which60,000 Btu/hr is latent heating load. To maintain an...
- Q Plot several streamlines (including the stagnation and a fewinternal and external streamlines) of a 2-D semi-infinite body in afree stream of U = 0.35 m/s, and the asymptotic radius of...
- Q Is the relation \"delta h(enthalpy) = m * Cp,avg * delta T\"restricted to constant pressure process only, or can it be used forany kind of process of an ideal gas?...
- Q Is the relation \"delta h(enthalpy) = m * Cp,avg * delta T\"restricted to constant pressure process only, or can it be used forany kind of process of an ideal gas?...
- Q What is the difference between a series circuit and a parallelcircuit? which circuit is better? Think about where he circuitcould be used in an automotive/chat application.
- Q sort out the post-tensioning systems （recent systems）no more than 500 words
- Q a MATLAB script that: • Prompts the user for - a lower-bound forthe plot interval and stores it in a variable named Lbound - anupper-bound for the plot interval and...
- Q A brief overview of Prestressed concrete investment in Korea andpercentage of applicationno more than 500words
- Q A brief overview of Prestressed concrete investment in NorthAmerica and percentage of applicationno more than 500words
- Q An expansion valve in a refrigeration cycle throttles R134a from1.2MPa saturated liquid to 0.32MPa. What is the specific volume atthe exit of the expansion valve in unit of m3/kg. Round...
- Q Design a speed-increasing gear train with a speedratio of SPR defined below:Speed ration = 13The gear train does not need to be reverted. Specifythe appropriate numbers of teeth to minimize...
- Q An ideal vapor compression refrigeration cycle using r134a asthe refrigerant is being used to cool a house. It provides 3refrigeration tons ≈ 10.5kW of cooling (heat removal from the houseair)....
- Q Consider the flow of a liquid metal past a flat plate (Pr<< 1). We have shown that for a constant wall teemperature,T_o, the Nusselt number is given by Nu =...
- Q Explain how confinement affects detonation properties,specifically in non-ideal high explosives.(Using Annual Review ofFluid MechanicsHigh Explosive Detonation–Confiner Interactions for reference).
- Q Ina metallurgy TTT diagram plain carbon steel, pearlite 50% isreached. Is this eutectoid, hypo, or hyper and why. Also what isits composition and designation of the alloy.
- Q examine the structure of the materials management processes forthese types of items. Specifically, address the following:What are some necessary considerations when designing amaterials management process for bulk and long-lead time...
- Q Steam enters an adiabatic turbine at 500C and 4.0MPa and 80m/s.The steam leaves the turbine as saturated liquid-vapor mixture at30kPa, quality of 92% and 50m/s. The mass flow rate of...
- Q A tube with a diameter of 6.45 mm was placed in a liquid with a density of 998 kg / m3 and it was observed that the liquid increased by...
- Q Steam is compressed by an adiabatic compressor from 3 bar and160°C to 10 bar and 350°C at a rate of 1.30 kg/s. The power inputto the compressor is626 kW481.6 kW370.5...
- Q You drop a 2 kg rock from the edge of a cliff. How much kineticenergy does the rock have when it has dropped 5 meters down? Whatspeed does it have?...
- Q The following true stresses produce the corresponding trueplastic strains for a brass alloy:True Stress (psi)True Strain509000.10613000.21What true stress is necessary to produce a true plastic strainof 0.25?
- Q 11. Draw a schematic of a swash plate axial piston pump withinclined pistons. Explain briefly its function and give anexpression for its geometric volume.
- Q A 60 kg Drum of diameter 40 cm containing waste material ofdensity 1100 kg/m^3 is being lifted by a steel cable of diameter 30mm. When the drum is hoisted 10m...
- Q G6C5_EOC32 including the followingclarifications/additions/modifications: [10] - Interpret “Make twoplots on one page.†to mean in the same Figure Window. - Includegrid lines in both plots to make it easier to...
- Q For the case of uniform body forces, show that the plane stressequilibrium equations imply that2∂ 2 τxy/∂x∂y = −∂2σx/∂x2 − ∂2σy/∂y2
- Q how is the angle between power strokes determine
- Q Estimate a real root of the polynomialf(x) = 5x4-2x3-25x2-6x+45 betweenx=1 and x=2 (using bisection, Standard Newton-Raphson, Secant, andmodified Newton-Raphson, and modified Secant methods). Show thedetailed calculations for 5 iterations (for...
- Q A normal shock moves at a constant velocity of 500 m/s intostill air (100 kPa, 0â—¦C). Determine the static and stagnationconditions present in the air after the passage of the...
- Q Show step by step the answer and writeclearlyConsider a steam power plant operating on the ideal reheatRankine cycle.The steam enters the high-pressure stage turbine at 15 MPa and600 oC andthe...
- Q 28. Fluid Momentum problems are solved with the aid of twodiagrams of such problems. Explain, list or define items whichwould be included on each of the two diagrams required, anddescribe...
- Q 1. If an ideal solution of the flow field through a nozzle isshown with a depiction of vectors distributed at points throughoutthe nozzle that illustrate the magnitude and direction of...
- Q consider a fuel cell operating at 800 degrees Celcius, and 1atm. In the cathode, humidified air is supplied with the molefraction of water vapor equal to 0.1. If the fuel...
- Q Solve by hand /No DynacamDesign a single dwell cam to move a follower, dwell for 120 deg,rise from 0 to 3 inches in 100 deg and fall 3 inches in...
- Q Another less efficient way to estimate pi is the Gregory-Leibnizseries: pi = 4/1 -4/3 + 4/5 -4/7 + 4/9... . Use a while loop toapproximate pi using this technique (5...
- Q Another less efficient way to estimate pi is the Gregory-Leibnizseries: pi = 4/1 -4/3 + 4/5 -4/7 + 4/9... . Use a while loop toapproximate pi using this technique (5...
- Q Open ended questionDesign a power plant for a city. Design and list steady-stateflow devices required to convert energy from natural gas intoelectricity. Set up conservation of mass and the first...
- Q Whyshould the valve cover and heads surface be cleaned before youinstall the engine cover
- Q Name two sources of renewable energy that you know and one wayof harvesting and storing energy from one of them. Make a sketch ofthe process and label the components that...
- Q Name two sources of renewable energy that you know and one wayof harvesting and storing energy from one of them. Make a sketch ofthe process and label the components that...
- Q As part of a heat treatment process, cylindrical, 304 stainlesssteel rods of 100-mm diameter are cooled from an initialtemperature of 500ºC by suspending them in an oil bath at 25ºC....
- Q Estimate the percentage of specular component of total solarradiation onto flat surfaces. Consider the following flat surfaces:(a) surface roughness of 0.1 µm; (b) surface roughness of 1.0 µm;and (c) surface...
- Q Elementary Partial Differential EquationsHeat flow in a circular cylinder.Consider a strand of heat-conducting material, homoge- neouswith heat capacity c, thermal conductivity κ, and surface heattransfer coefficient μ. The strand is...
- Q Explain different types of welding?
- Q A closed, rigid tank fitted with a paddle wheel contains 2.2 kgof air, initially at 200oC, 1 bar. During an interval of 20minutes, the paddle wheel transfers energy to the...
- Q Steam at 50 Bar and 500oC is expanded isentropically through asingle stage turbine to a condenser operating at 1 bar.Assuming the steam at turbine exit is Dry Saturated Steam andthe...
- Q  1.      True or false: heating air de-humidifies it.2.      What capacity (power) electric heater would be needed to raise the temperature of 300 cubic feet of concrete from 65° F to 150° F...
- Q 1. How much oil (in tonnes) would be required in an oil-firedpower plant to generate the equivalent amount of electrical energyas the hydropower generates in a year? The energy content...
- Q ‘A walk in thermodynamics’: starting with a subject of yourchoice in Wikipedia, try and follow some links to get to a subjectwe have studied in thermodynamics. Write down which topics...
- Q A gasoline engine is modified to run on hydrogen. Assuminghydrogen releases heat at the rate of 120 MJ/Kg when burnt, a.Write the chemical reaction involved in burning of hydrogen in...
- Q A cylinder of an unknown length made of copper is used beingused to support a roof is deformed elastically in tension by aforce. The diameter of the cylinder is 25...
- Q What are the air-standard assumptions and the cold air-standardassumptions in analysing engine cycles? How an actual combustionprocess is being simplified in ideal engine cycles?
- Q Suggest and briefly explain one practical method tosignificantly increase the production rate of a Die Casting processwithout the need to buy additional capitalequipment.
- Q A person can never be morally responsible for causing a badoutcome that they did not want to happen (even if they thought itmight happen).Select one:TrueFalse
- Q An 8-m-long, uninsulated square duct of cross section 0.2 m X0.2 m and relative roughness 10-3 passes through the attic space ofa house. Hot air enters the duct at 1...
- Q A single stage simple vapr compression refrigeration cycle usingR12 refrigerant is operating at a condenser temperature of 40degrees C and an evaporator temperature of -5 degrees C. If thecompressor is...
- Q A closed piston-cylinder system undergoes a cycle:​Process 1 to 2 is an expansion process where heat is added. Thetemperature remains constant.Process 2 to 3 is a constant volume heat addition...
- Q Engineering Mechanics (8th Edition) Chapter 3, Problem 212PÂ
- Q Saturated liquid water at 1 MPa enters a D = 5 cm pipe at a rateof m(dot) = 2 kg/s. Heat is transferred to the water at a rate ofQ(dot)...
- Q One kg of water in a piston-cylinder assembly,initially at 1.5 bar and 200 C, cools at constant pressure with nointernal irreversibilities to a final state where the water is asaturated...
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