Mechanical Engineering question and answers for July 23, 2023
- Q The measurement of heat loss through egg shell and the thermalenergy contained in a boiled egg.Deriving the convection heat transfer coefficient between theegg shell and ambient air might be the...
- Q A rocket motor burns LH2 and LOX. The combustion chamberpressure and temperature are 25 atmospheres and 3517 K,respectively. The area of the nozzle throat is 0.1 m^2. The nozzleexit area...
- Q 3.) Product with Cp = 0.75 Btu/lb°F is flowing at a rate of 3300lb/h and has to be cooled from 221°F to 160°F. ? Cooling water at60°F at a mass...
- Q Q: If a plastic can be recycled, what is its functionality?
- Q Q: Does chainfolding occur in polystyrene? Please explain.
- Q Consider two-dimensional incompressible plane viscous flowbetween parallel plates a distance 2h apart, with the origin alongthe centerline. The plates are very wide and very long, so that theflow is essentially...
- Q A four-cylinder four-stroke engine is operating at a bmep of 2bar. The pressure at inlet valve closure is 0.37 bar, and the fmepis 0.8 bar. Assuming that the engine gross...
- Q Two possible overhead valve combustion chambers are beingconsidered, the first has two valves and the second design has fourvalves per cylinder. The diameter of the inlet valve is 23 mm...
- Q Describe the differences in valve timing on a naturallyaspirated diesel engine, a turbocharged diesel engine, and ahigh-performance petrol engine.
- Q The spiral of Archimedes is a curve described in polarcoordinates by the equation ?? = ???? where ?? is the distance of apoint from the origin, and ?? is the...
- Q What is a compressed Air Turbine? What’s it used for ? Benefits?How is a mechanical break used with it ?
- Q what is the slip plane for the lomer Cottrell barrier formed bycombining the (a/2)[-110] on (111) with the (a/2)[101] on(1-1-1)
- Q explain the differences between E and S glasses
- Q List as many health and safety protocols ie EN .... any legislationregarding designing a locomotive (ie the drive systems used )
- Q 13.0 (20 pts)Â Â Â An electroplating process willbe used to coat the exterior surface of a 160 mm diameter x 1.5meter long cylinder with silver. Determine the time in minutes toelectroplate...
- Q A W8 3 31 rolled-steel shape is used for a column of 21-ft effectivelength. Using allowable stress design, determine the allowablecentric load if the yield strength of the grade of...
- Q Using the Faraday equation. What current and time are needed toplate a 1 mm thick layer of copper onto an object with a surfacearea of 0.1m2 ? The density of...
- Q What are the synthesis methods for carbon nanotubes? What is the general growth mechanism for CNTs? List at least 2 potential applications for CNTs. What are the synthesis methods for...
- Q two large aluminum plates (k =240W/m.K) each 1cm thickwith 10micrometer surface roughness are placed in contact under apressure of 1bar in air (k=0.026W/m.K). The temperature at theinside and outside surfaces...
- Q In a heat treatment of a specific excavator bucket tooth of 15kgmass, the tooth is heated to 8850C and to achieve therequired level of physical properties it needs to be...
- Q Advantages, disadvantages and typical applications forthe Acoustic Emission Testing.
- Q what is the impact that the technology did?the technology is the auto focus cameras on the phone or cameraswhich is a mechatronics system(can you type it please it is hard...
- Q Fluid enters a tube with a flow rate of 0.021 kg/s and an inlettemperature of 20°C. The tube, which has a length of 6.280 m anddiameter of 15 mm, has...
- Q explain the design , construction and working of aparallel and counter flow shell and tube types of heat echangers?also draw figures
- Q The Acme Widget Company has generally followed a relativeconservative business model and has done well. Their sales havebeen relatively stable over the past decade and represent about 40%of the powered...
- Q Discuss how turbulence influence the heat transfer process inconvection pipe flow
- Q Discuss the meaning/importance in 2-3 sentences per term(directly copying verbatim answers from thesaurus will carry NOpoints)(1) Beach or clamshell marks; (2) Chevron pattern; (3) Creep;(4) Endurance limit; (5) Factor of...
- Q Explain the importance of the failure and fatigue analysis, andhow these two are conducted in the industries.What are the problems and uncertainities in doing theseanalysis?Minimum Words required: 3000Please dont just...
- Q Write a literature review on• the catastrophic effect of failure and fatigue onstructureDont just copy paste from net please
- Q 1222Air enters a heating section at 100 kPa, 9oC, 45%relative humidity at rate of 10m3/min, and it leaves at22oC. Determine (a) the rate of heat transfer(Q?) in the heating section...
- Q 91. What are the essential differences between arc welding andresistance welding ?2. Essential differences between brazing and fusion welding?3. Explain the basic principles of arc welding processes4. Why arc welding...
- Q Briefly describe how a Design of Experiments methodology can beused when testing a new pump design that has three variables(number of impeller blades, channel depth, outlet diameter). Whywould a factorial...
- Q if the pilot light on a gas water heater will not staylit... what seem to be the problem?
- Q The following information is for a proposed project that willprovide the capability to produce a specialized product estimatedto have a short market (sales) life before new technology, known tobe in...
- Q From an iron-carbon phase diagram, plotted in terms of weightpercent carbon:A) What is the composition in weight percent of the iron-carbonalloy that has the lowest melting temperature? What is this...
- Q Consider a vapor power cycle as shown below. Steam enters thefirst turbine stage at 12 MP a, 480 oC, and expands to 2 MP a. Somesteam is extracted at 2...
- Q Sketch and label the parts of a standard roller chain.
- Q 1. Two samples of a low hardness steel were tested using aRockwell C hardness tester and the Rockwell B scale at the same labon the same day. The difference between...
- Q The dry and wet-bulb temperatures of atmospheric air at 95 kPaare 25C and 20C, respectively. Determine (a) the specific humidity,(b) the relative humidity), and (c) the enthalpy of the air...
- Q Design a straight ended helical torsion spring for a static load200 N-m at a deflection of 45 deg with a safety factor of 1.8.Specify all parameters necessart to manufacture the...
- Q The data listed below are claimed for a powercycleoperatingbetween reservoirs at 527_C and 127_C. For eachcase,determine if any principles of thermodynamics would beviolated.(a) QH = 700 kJ, Wcycle = 400...
- Q 1. What would be the maximum concentration of Toluene (PEL 200ppm) that an atmosphere could contain if your air purifyingrespirator has been tested with the following results: maskconcentration of nontoxic...
- Q Problem 3: Fit the following data with a parabola. Use bothNewtonian and Lagrangian interpolating polynomials. x 0.75 2 3 4 68 8.5 y 1.2 1.95 2 2.4 2.4 2.7 2.6
- Q 1. If 0.05kg of a gas occupying a volume of 0.03m3 at1.025 bar is compressed reversibly until the pressure is 6.15 bar.Calculate the final temperature, the work done on the...
- Q -What type(s) of effects are the radiation protection standardstrying to prevent?type the answer please
- Q A certain amount of viscous fluid is placed onto a flat surface.Determine the pi terms that describe the fluid spreading out overthe plate as time progresses. For example, these pi...
- Q When a safeguard is said to be \"muted\", what does thatmeans?
- Q Discuss the testing procedures for a fibre composite material,showing all parties involved, from the beginning until obtainingfinal test report. Discuss also the importance and need ofobtaining such test results and...
- Q Air (cp = 1.0 kJ/kgK) enters an air conditioning system at 40Cwith a mass flow rate of 1.5 kg/s. The air is cooled by exchangingheat with a stream of R-134a...
- Q 3. A CNC Lathe is controlled by a 151 step motor which is usedto drive a lead screw with 0.25 inch pitch.(i) What is the precision or minimum distance a...
- Q 8. Consider an airplane whose takeoff speed is 220 km/h and thattakes 15 s to take off at sea level. For an airport at an elevationof 1600 m (such as...
- Q 5|P a g e5.Define inorganic glass ?Explain main glass formers, conditional glass formers,intermediate oxides, and network modifiers? In a viscosityversus temperature profile,can you please define strain point, annealing point, glasstransition...
- Q 3. A jet aircraft has a drag polar CD = CD,0 + CL 2 /(?e?) =0.02 + 0.04 CL 2 and wing area 500 m2 . Its initial weight is3,000,000...
- Q 5. Consider an airplane with wingspan 40 ft, wing area 250 ft2 ,and weight 12,000 lb. Assume that the Oswald efficiency factor is0.9. The airplane is flying at a velocity...
- Q This is a numerical methods question using MATLAB.Which of the following code snippets finds the forwarddifference estimate of the derivative at each of the x values.Assume x and y have...
- Q A wall is constructed of two layers of 2-cm-thick sheetrock (k =0.17 W/m·K) separated by 16 cm by wood studs (k = 0.11 W/m·K) whosewidth is 5 cm. The studs...
- Q Q] The historical actual sales of an item purchased by a factoryis given below. What would have been the forecast had the managera) used 3 period moving average to make...
- Q For a bolted assembly with six bolts, the stiffness of each boltis kb = 4 Mlbf/in and the stiffness of the members is km = 16Mlbf/in per bolt. A fluctuating...
- Q If the valve face and valve seat do not contact each otherevenly after reconditioning---. a. regrind the value with the samestone b regrind the seats with stones of different angles...
- Q 6-A frame UF was moved along its ownn-axis a distance of 5 units, then rotated about itso-axis an angle of 600 , followed by a rotationof 600 about the z-axis,...
- Q You decide to design a heating element using a piece of polishedcopper wire, 10mm in diameter with an emissivity of 0.08. It willmaintain a constant surface temperature of 325°C when...
- Q Calculate the takt given the following information: ? Two shiftsat 8 hours each shift ? Two 10-minute breaks per shift ? 25 minutelunchtime per shift ? There are a total...
- Q Common practice in chemical processing plants is to clad pipeinsulation with a durable, thick aluminum foil. The functions ofthe foil are to confine the batt insulation and to reduce heattransfer...
- Q identify the stages in the appropriate order in theprecipitation hardening of an aluminum alloy
- Q Question 1c (0.5 pts): In a study published in 2016, a team ofresearchers found that tensile strain caused the valence band of anorganic semiconductor to narrow and fall to lower...
- Q As an engineer how will you design a roomtaking into account thermodynamics and heattransfer?
- Q For a catapult project I must make a MATLAB code that shouldmake use of the projectile motion equations so for a given inputrange R (horizontal distance from the catapult to...
- Q 5. Explain how density is affected by crystal shape, i.e., BCCor FCC.6. Why would you temper material such as steel? If not tempered,how does that influence its likely failure, what...
- Q 1. Why are components made from steel or aluminum alloy used onaircraft?2. For each of the following suggest a part on an aircraft thatneeds that particular material property: hardness, strength,elasticity,...
- Q ThermodynamicsThe centrifugal compressor in a refrigeration system operatingat steady state conditions, compresses adiabatically 0.1 lbm/s ofsaturated R-134a vapor at 0°F to 200 psia. Answer thefollowing.a. Create a schematic representation of...
- Q Analytical Solution stepsFor a flat plate solar collector, with water as the workingfluid, consider a design for heating water from 22°C to 60°C. Thetemperature of the air and the surroundings...
- Q Consider an ideal Rankine cycle using water with a high-pressureside of the cycle at a supercritical pressure. Such acycle has a potential advantage of minimizing local temperaturedifferences between the fluids...
- Q A man is pulling a 120 lb wooden box by a rope with a force of80 lb along a wooden floor. The rope is 45 degrees from thehorizontal. The coefficient...
- Q Q5. State whether the following are true orfalse with brief justifications:(i) The maximum thermal efficiency for any power cycle operatingbetween two thermal reservoirs at temperaturesT1 andT2(T1 >T2) is 1-T2/T1.(ii) Transferring...
- Q What A laminated steel (E = 200 GPa and ? = 0.3) cylinderconsists of a jacket with an inside diameter of 200 mm and anoutside diameter of 300 mm shrunk...
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