Mechanical Engineering question and answers for July 27, 2023
- Q The capacity of a propane vapor-compression refrigeration systemis 8 tons. Saturated vapor at 0°F enters the compressor, andsuperheated vapor leaves at 120°F, 180 lbf/in.2 Heattransfer from the compressor to its...
- Q A fixed-mass system contains water (H20) in a rigid(fixed-volume) container. The mass of the water is mass, m=1.805719781 kgs. A process occurs having the following initial andfinal thermodynamic properties.Initial Pressure:...
- Q ) One of the major functions of cooling tower is to cool hot butdry gas flow via spray vaporization under a counter-flowmode.  a);List governing mechanisms (e.g., mass, momentum and heattransfer) and...
- Q The intial conditions for an air-standard Otto cycle operatingwith a compresssion ratio of 8:1 are 14.7 psia and 60degF. At thebeginning of the compression stroke, the cylinder volume of 270in^3...
- Q Mahjong, Inc., has identified the following two mutuallyexclusive projects:YearCash Flow(A)Cash Flow(B)0–$37,400      –$37,400      119,750      7,300      215,270      13,800      312,750      20,270      49,750      24,270     Required:(a)What is the IRR for ProjectA?(Click to select)23.45%22.77%23.91%22.09%21.63%  (b)What is the IRR for ProjectB?(Click to select)21.31%21.97%23.07%22.63%20.87%  (c)If the required return is 10percent,...
- Q The air mass flow rate of a jet engine is 10 kg/s. Thestagnation enthalpy at the exit of the turbine is 918 kJ/kg and theexcess air is 4.5.(a) What should...
- Q A tube is placed vertically in a beaker of salt water with aspecific gravity of 1.15. The interfacial tension between the airand the water is 32 mN/m and the contact...
- Q An epedemic is spreading form human to human. A hospital countson the start of the epidemic 100 infected patients visiting on oneday. One day later the number of patients coming...
- Q An industrial coal-fired boiler for process steam is equippedwith a 10-year-old electrostatic precipitator (ESP). Changes incoal quality have caused stack emissions to be in noncompliancewith federal standards for particulate. Two...
- Q A cross bar of a planer weighing 9 kN is raised and lowered bymeans of two square threaded screwsof 40 mm outside diameter and 6 mm pitch. The screw is...
- Q Charlie Chaplin’s Modern Times offers a parody of the assemblyline grounded in real events. identify two scenes from the movie(you can either describe them briefly or use screen shots) thatcapture...
- Q A thin tungsten wire (i.e. a filament) is heated to a giventemperature T. In the visible range (i.e. wave length between0.39µm and 0.77µm), Determine the following for the four caseslisted...
- Q Consider a Carnot-cycle heat pump with R-410a as the workingfluid. Heat is rejected from the R410a at 35 oC, during whichprocess the R-410a changes from saturated vapor to saturatedliquid. The...
- Q A system for the storage of thermal energy is to be designedusing an underground tank of water. The tank is buried at a depthof 3 m and is a cube...
- Q 1. Is the strength of a beam under a static load necessarilyrelated its stiffness?2. Distinguish between primary failure and secondaryfailure.
- Q NOTE: What would the anwser be if it was a square plate with acircular hole?The metallic, circular plate of diameter D and thickness t, hasa concentric hole of diameter h...
- Q Water is contained in a closed, rigid, 0.2 m3 tank atan initial pressure of 5 bar and a quality of 50%. Heat transferoccurs until the tank contains only saturated vapor....
- Q 1. _____ lead to distortion surrounding the welded joints.(a) Residual stresses (b) Cracks (c) Overlap (d) Incompletefusion2. Which of the following is NOT an issue in welded joints?(a) Porosity (b)...
- Q What is transient heat transfer? why it is important?
- Q Please type the answerQ) For the short to medium- term (10 to 50 years). State aminimum of five realistic steps (not subsidies) that can beimplemented to achieve a sustainable energy...
- Q Please type the answerQ) For the short to medium- term (10 to 50 years). State aminimum of five realistic steps (not subsidies) that can beimplemented to achieve a sustainable energy...
- Q An interesting flow results from superposition of a point sourcewith strength m located at the origin and a uniform flow ofstrength U. Find the complex potential for this flow combinationand...
- Q A refrigerant (R-134 A) at 0.8 MPa and 30 deg Celcius isthrottled in a steady flow to a lower pressure and a temperature of-10 deg Celcius. What is the specific...
- Q An oil cooler is in the form of a single shell 4 tube heatexchanger in which oil passes through the tubes and cool waterpasses through the shell. Water comes in...
- Q how can i redesign a simple bench vise inorder to decraese thetotal assembly time in solid works
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