Mechanical Engineering question and answers for July 21, 2023
- Q Explain the difference between heat treatable aluminum alloysand work hardenable aluminum alloys. Which is more easily coldworked? Why?
- Q One kilogram of Refrigerant 134a vapor initially at 2 bar and20°C fills a rigid vessel. The vapor is cooled until thetemperature becomes -24°C. There is no work during theprocess.Let To...
- Q Calculate the number of cycles to failure (Nf) of an aluminumalloy exposed to reverse tensile-compressive loading (N) with astress amplitude of 150MPa.  A = 2x10^-12.  n= 2.5m.If initially the length...
- Q What are the unique PLM needs for a small and mediumcompany? 1000-1500 words
- Q 3 Kg mass of water is heated to atemperature of 99.5 C at 1 bar of pressure. It is slowly pouredinto a heavily insulated beaker containing 7.5 Kg of water...
- Q 1) Explain how different engine operating conditions affectcombustion ( ignition delay, temperatures, air fuel ratio, speed,heat transfer)?2) What are the 3 sources of NOX formation, which is the leastrelevant, which...
- Q A design related question.1)design a walk in refrigerator and freezer with 10ton and 30 ton cooling capacity respectively.2) freezer must be maintained between (24 to 15 deg celcius) andrefrigerator between...
- Q Many sports cars are convertibles. The air flow over such a caris significantly different depending on whether the convertible topis up or down. The engine of the 1000-kg car delivers...
- Q What are austenitic steels? Write about their a) alloyprinciples b) effects of alloys (mechanical and radiationproperties)Provide references, please.
- Q Intwoer crane , Explain the possiibility on the identifiedmechanism
- Q A project requires weighing and dispensing of multiple hi-potent(ECL>3) pharmaceutical compounds in powder form for ablockbuster, commercially marketed drug, it’s a sterile processingplant. Provide your conceptual HVAC design description that...
- Q A combined cycle power system uses a simple gas-turbine Braytoncycle in conjunction with a simple Rankine cycle to produce a totalpower of 100 MW. In such configuration, the exhaust stream...
- Q For AISI 1050 Steel at 10 cm in diameter, use case hardeningmethods to produce a surface hardness of at least 60 HRC. Describethe method that will create a thin, carbon...
- Q Describe the potential land impacts of wind turbineinstallation.
- Q What are the major electromagnetic interference effect of windpower systems?
- Q What are considerations to reduce the visual impacts of windturbine installation?
- Q What are the methods to access the bird risk with wind turbinepower system?
- Q An air–fuel mixture enters a constant area combustion chamber ata velocity of 100 m/s a pressure of 70 kPa and a temperature of150°C. Assuming that the fuel–air ratio is 0.04,...
- Q Air enters a constant diameter pipe at a pressure of 200 kPa. Atthe exit of the pipe the pressure is 120 kPa, the Mach number is0.75, and the stagnation temperature...
- Q The power source in a particular welding setup generates 3119watts that can be transferred to the work surface with a heattransfer factor of 0.65. The metal to be welded is...
- Q Air flows through a 0.25-m-diameter duct. At the inlet thevelocity is 300 m/s, and the stagnation temperature is 90°C. If theMach number at the exit is 0.3, determine the direction...
- Q A journal and bearing are to be designed for a shaft that turnsat 250 rpm. SupposeISO VG100 (SAE Engine 30) is to be used as lubricant and thebearing length is...
- Q ( Project question ) What do you understand by strain gauge,high light major principle and working differences betweenresistance transducer and piezoelectric transducer strain gauge.please make the font of writing clear...
- Q Please prove that in homogeneous nucleation of solidificationthe critical radius and activation energy are ?? ? = (? 2??????????? ) ( 1 ??? ) and ??? ? = ( 16????...
- Q Thermodynamics1. Correct Answer: 32.29 ± 4%A 1.4 m3 tank fills through inlet A while supplying waterthrough outlets B and C at the rates given below. Determine howlong (minutes) it will...
- Q This is problem 7-6 from El-Wakil’s Powerplant Technology book-- a wet cooling tower receives 1.5x106lbm/min of condenser water at 96 degFahrenheit, and1.25x106 lbm/min of air at 1 standardatmosphere, 62 degFahrenheit,...
- Q This is problem 7-5 from El-Wakil’s Powerplant Technology book-- an included-draft cooling tower cools 90,000 gallons per minuteof water from 84 to 68 degFahrenheit. Air at 29.75 inHg absolutepressure, 70...
- Q Compare the three types of lubrication systems for plainbearings using sketches and Bearing Parameter/ Stribeck Curve.
- Q What are Fixed side and Floating side bearing arrangement?Explain their applications with sketches.
- Q An airfoil profile to be used on a wind turbine blade is testedin a wind tunnel. The prototype (full-scale) airfoil section has achord length of 2m and moves at 50...
- Q Along, square, electrical heating element standing on a cornerwith one side of the square heating element being 25mm, thermalconductivity k = 240 W/m ? K, density ñ = 2700 kg/m3,...
- Q what are the differences of all these cooling load calculationmethods? What are the full name of these methods and the strengthand limitation of these approaches?a)HB methodb)CLTD methodc)RTS method
- Q At an altitude where the air is at 35 kPa and -40°C a turbojetaircraft flies with a velocity of 260 m/s. Compressor has apressure ratio of 10, and the temperature...
- Q Answer the following questions:1. What is PFCU functions and State the advantage andDisadvantages of PFCU?2. What do you understand about fly by wire?Answer the questions in paragraph form.Copied answer will...
- Q A manufacturer wishes to choose between two ceramics for acertain application. Data for the two ceramics tested underidentical conditions were as follows:CeramicMean Fracture StressWeibull ModulusA500 MPa12B600 MPa8The service conditions are...
- Q Use the Navier-Stokes equations to show how pressure varies withx, y and z in a hydrostatic fluid.
- Q A velocity field is described by the following equations: ?? =10y/(x^2 +y^2) , ?? = -10x/(x^2+y^2) , and w=0 (a) Is this flowcompressible or incompressible? (b) Find the pressure gradient.Assume...
- Q For the case of incompressible flow, write all 3 components ofthe Navier-Stokes equations and the complete form of thedifferential continuity equation.
- Q 8.8. Consider blood flow in a vessel (i.e., a pipe with a porouswall that is permeable to blood). The radius and length of thevessel are R and L, respectively. In...
- Q Water at 300kPa and 20oC is heated in a chamber bymixing it with superheated steam at 300kPa and 300oC.The cold water enters the chamber at a rate of 1.9 kg/s....
- Q A jet engine flies at 205 m/s at an altitude where thepressure is 0.466atm and the temp is 249K. The pressure recoveryfactor across the intake is 1.0 and the compressor...
- Q How are the requirements for a design project developed?
- Q Is it possible to design products without any demand? Explainyour answer with the likely consequences.
- Q A vapor-compression heat pump with a heating capacity of 500kJ/min is driven by a power cycle with a thermal efficiency of 30%.For the heat pump, Refrigerant 134a is compressed from...
- Q One kg of Methance (CH4) is burned with 200% theoretical air.What is the air fuel ratio on a mass basis?
- Q Consider a simple Brayton cycle using air as the working fluidwith properties assumed constant and evaluated at room temperature(300 K). Conditions at the compressor inlet are T1 = 25°C and...
- Q 1. The recorded wind speeds of a wind site are one-third ofthe year is at 15 mph, one-sixthof the year is at 25 mph and the one-half of the year...
- Q A 3-phase, 5 kVA, 208 V, four-pole, 60 Hz, Y-connectedsynchronous machine has negligible statorwinding resistance and a synchronous reactance of 8per phase at rated terminal voltage. Themachine is operated as...
- Q what is the enthalpy of formation for c4h8??????????????
- Q # Heat Transfer,Why the ratio of (thermal resistance of conduction)/(thermal resistance of convection) must be less than .1 for a system to lumped.Â
- Q A converging nozzle feeds an insulated square duct (L = 224 ft,W = H = 8.0 in, f = 0.02) with air flowing steadily at 7200lbm/min. The inlet stagnation temperature...
- Q Why is there this grinding teeth in automatic carsystem? Is it bad fuel, choice of oil, engine and gear meetingpoint, bad/faulty gear/transmission system
- Q As speed increases in an engine with throttle body fuelinjection, does the temperature of the air-fuel mixture at theintake manifold exit increase or decrease? Explain what parametersaffect your answer.
- Q A technician has learned all techniques and skills for materialprocessing. But he has never learned material science. Now he wantsto find a material that its weight is as light as...
- Q Canyou explain how to calculate volumetric flow rate of a mixture oftwo fluids (50 % water and 50% glycerol by volume) flowing througha pipe, when temperature is given, diameter is...
- Q 2. Needs Assessment for Coastal Tool RentalKathleen Marsh is a recent community college graduate who plansto open an equipment and tool rental store in the next few months.The store will...
- Q Calculate the 0-100 km/h (0-62 mph) acceleration time for avehicle of effective mass(m) 1000 kg (2205 lb), rolling resistance (R) 225 N for arange of drag coefficients Cd = 0.24,...
- Q The purpose of this problem is to use graphic user interface(GUI) to interactively store grades in a text file, rather thanadding them manually to a script. Follow these steps to...
- Q It is observed that polycrystalline chromium has a highertensile strength than single crystalline chromium. Propose a reasonfor this difference in tensile strength
- Q 3.A simple Rankine cycle uses water as the working fluid. Theboiler operates at 6000 kPa and the condenser at 50 kPa. At theentrance to the turbine, the temperature is 450°C....
- Q Alloy NameTSGS?y MPaSE GPaSKICÂ Â Â MPa(m)0.5Al-7075T62.8117925.59.254340 steelOQT7.8514826.17.64Mg-ZK61AT61.8310624.68.19Ti-8Al-1Mo-1VSTA4.3713014.618.76Problem 9In a design where weight is a critical factor, such as in aspace shuttle frame, and specific yield strength, specific elasticmodulus, and specific fracture toughness...
- Q The uniform pole of length 5 m and mass M = 94.2 kg is placedagainst the supporting surfaces shown. If the coefficient of staticfriction at both A and B is...
- Q Use knowledge of engineering science and mathematics to predict some key performance metrics of the caravan (weight, cost of manufarure, acceleration etc)
- Q write down the slater determinant For the ground state of Beryllium(4 electrons )and indicate which states are allowed or not? Explainon of the terms ? does the wave function that...
- Q A refrigerator using R-12 as the working fluid keeps therefrigerated space at ?16? in an environment at 27?. You are askedto upgrade this refrigerator by replacing R-12 with theozone-friendly R-134a....
- Q Write a Matlab script that computes the element level stiffnessmatrix and force vector for linear elasticity.
- Q A refrigerator using R-12 as the working fluid keeps therefrigerated space at ?16? in an environment at 27?. You are askedto upgrade this refrigerator by replacing R-12 with theozone-friendly R-134a....
- Q Explain the function of the following components with referenceto sheet metal (progressive) dies.a) Pilot, and b) Back Gage
- Q In the boiler of a power plant are tubes through which waterflows as it is brought from 0.8 MPa, 150°C to 240°C at essentiallyconstant pressure. The total mass flow rate...
- Q General Motor Programs solve an issue/flaw of Motor ControlTheory. Which one is it? Explain how/why they solve this issue?
- Q Ina certain space to be air conditioned the sensible and latent heatloads are 20.60 kW and 6.78 kW, respectively. Outside air is at 33degrees dry bulb and 24 degrees wet...
- Q If the values for reduced pressure and compressibility factorfor ethylene are 2 and 0.6 respectively, compute thetemperature.
- Q How many sections do we usually divide the interval in whenusing Trapezoidal rule?
- Q what can cause water pipes to vibrate and makenoise
- Q Precision Machining Technology (2nd Edition)Chapter 8SU6, Problem 10RQBriefly explain the difference between rigid and nonrigidtapping.Thanks!
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