Mechanical Engineering question and answers for July 22, 2023
- Q A system that operates in a reversible cycle receives energy byheat transfer from a 15.7oC reservoir at a rate of 26.9 kW, anddelivers energy by heat transfer to a 49.8oC...
- Q An insulated tank containing 0.5m3 of R-134 at 500 kPa and 90%quality is connected to an initially evacuated insulatedpiston-cylinder device. The force balance on the piston is suchthat a pressure...
- Q Metal hydrides are metal alloys that can store significantquantities of hydrogen in their atomic lattice. For this reason,they are considered potentially attractive for the on-board storageof hydrogen for hydrogen fuel...
- Q a. Why are commercial or any aircraft that fly at altitude,pressurized?b. What is Pascal’s pressure assumption?c. What are typical pressures used within commercialaircraft?d. Explain air pressure and why it is...
- Q A gas turbine operates as a cold-air standard Brayton cycle. Airenetrs the compressor at 300K and 100kPa and is compressed to700kPa. During the heat addition process in the combustor, thetemperature...
- Q A counter-flow double-pipe heat exchanger is heating water from20 to 80 C at a rate of 1.2 kg/s. The heating is provided by waterat 160 C and a rate of...
- Q List the Social and Economic issues of with respect to powerplant
- Q Derive the Friction Hill equation for open die forging of acylindrical workpiece
- Q How carbon affect hardness?? and Discuss the hardenability ofeach material.1018 steel, 4140 steel, 1045 steel and 8620 steel
- Q A new semi-automatic machine costs $ 80,000 and is expected togenerate revenues of $ 40,000 per year for 6 years. It will cost $25,000 per year to operate the machine....
- Q Beer is to be pumped from a fermenting vessel to a racking tankat a velocity of 1.5 m/s through a 100 mm ID pipe, having anabsolute roughness of 0.05 mm....
- Q A 20 degree Brix apple juice is being pumped from an open tankthrough a 1-in nominal diameter sanitary pipe into a second tank ata higher level. The mass flow rate...
- Q Air is compressed from 100 Kpa and 22 C to an outlet pressure 8times greater. The compressor is not well insulated and loses heatat a rate of 120 kJ/kg. It...
- Q . For each of edge, screw, and mixeddislocations:Â Â Â Â Â Â Â (a) describe and make adrawing of the dislocation;Â Â Â Â Â Â Â (b) note the location ofthe dislocation line;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (c) indicate the direction along which the dislocation...
- Q Several types of thermoplastic elastomers were described inlecture and the textbook. Briefly describe the two phase model thatexplains the behavior of these polymers.
- Q Describe a biomedical application of poly-methyl-methacrylate(PMMA) or PMMA containing polymers, copolymers or blends.
- Q Describe and discuss:The method required to specify inlet and outlet conditions forsubsonic and supersonic flows.The reasons for having different source and dissipation terms inregions close to the wall and away...
- Q Discuss:How discrete momentum coefficients need particular modeling forthe turbulent flowsThe main reasons for limitations associated with algebraicturbulence models for recirculating flowsThe differences between RANS and LES turbulence models.
- Q Describe:-The reasons why the turbulent kinetic energy dissipation rateterms require particular modeling close to the wall.-The required boundary conditions for the turbulent kineticenergy equation-The detailed required boundary conditions for the...
- Q A circular solid shaft rotating at n=1000n=1000 rpm suports abending moment M=200M=200 klbf*in. Compute the life NN for shaftshaving four different diametersd1=2.6,d2=2.32,d3=1.93d1=2.6,d2=2.32,d3=1.93, and d4=4.16d4=4.16inches. Material properties: SUT=200SUT=200 kpsi, Se=50Se=50 kpsi,f=0.8,Nt=103,Ne=106f=0.8,Nt=103,Ne=106.
- Q An adiabatic steam turbine receives 50 kg/s of superheated steamat 5 MPa and 500oC. Steam exits the turbine with a pressure of 100kPa. Determine the minimum exit quality and the...
- Q Prepare 5 pages (max. ) brief description about Multiphase flowpumps that work at high gas volume fraction or percentage ( highGVF).The report should address the following important points:-Differences between multiphase...
- Q Howwould I go about making a simple code for an analog clock usingmatlab?
- Q Nitrogen (N2), at 300 K, 1 bar with a mass flow rate of 1 kg/senters an insulated mixing chamber and mixes with carbon dioxide(CO2) entering as a separate stream at...
- Q Consider a steam power plant operating on the simple idealRankine cycle. Steam enters the turbine at 15 MPa and 600°C. Thesteam condenses in the condenser at 10 kPa. Use the...
- Q A gearbox is to be designed with a compound reverted gear trainthat transmits 25 horsepowerwith an input speed of 2500 rev/min. The output should deliverthe power at a rotational speed...
- Q Water at 35°C is pumped through a horizontal, 200-m-long,30-mm-diameter tube at 0.25 kg/s. Over time, a 2-mm-thick layer ofscale of surface roughness e = 200 µ m is deposited on...
- Q When operated at N = 1170 rpm, a centrifugal pump, with impeller D = 8in., has a shutoff head ho = 25.0 ft of water. At the same operating speed,...
- Q What active sensors can be used to aid in localization? Whatlimitations arise from performing localization using only wheelencoders? Please type the answer
- Q Supercharging of an engine is used to increase the inlet airdensity so that more fuel can be added, the result ofwhich is an increased power output. Assume that ambient air,...
- Q Identify the trend of using sensors in the transportatoin (cars)area over timeDescribe change over three stages (time periods). Add referencesused.Initial:MiddleRecent:
- Q Water flows through a shower head steadily at a rate of 8kg/min. The water is heated in an electric water heater from 158Cto 458C. In an attempt to conserve energy,...
- Q A diesel engine intakes atmospheric air at 60°F and adds 800Btu/lbm of energy. If the maximum pressure is 1200 psia,calculate:(a) the cutoff ratio, rc ;(b) the thermal efficiency, ? ;(c)...
- Q What value does an iron carbon phase diagram have when heattreating steel?
- Q A hollow, round column has length (L = 1500 mm), outsidediameter (do = 20 mm) and inside diameter (di = 14 mm). If thecolumn is made of steel (E =...
- Q Noncubic ceramics are birefringent. Explain why this isimportant for polycrystalline alumina nose cones.
- Q Explain briefly why the transparency range ofsingle-crystal NaCl is much greater than for single- crystalMgO.
- Q A sheet of metal of 2 m ´ 2 m and 1.5 mm thickness is being tested in a wind tunnel.a. Calculate the critical velocity, in m/s, at which the...
- Q Consider a spherical vessel filled with a substance which isgenerating heat at a uniform rate of 10^5 W/m^3. The substance hasa thermal conductivity of 20 W/mK, and the vessel has...
- Q Perform sit-Âup exercises under the following conditions: 1)arms folded across the chest, 2) hands behind the neck, 3) holdinga five pound weight above the head. Write a paragraph explainingyour findings...
- Q Derive an expression for the U factor if the inside and outsidesurfaces of the tubes in a heat exchanger are finned and have finefficiencies of ?i and ?o on the...
- Q 4. Given a system of five (5) 3500-lb, 700 feet per minute (fpm)elevator cars. Gearless traction motors are being used for thissystem. Each car operates approximately 65% of the time...
- Q A single axis personal transport device starts from rest withthe rider leaning slightly forward. Together, the two wheels weigh25 lbs, and each has a radius of 10 in. The mass...
- Q The strength coefficient (K) and the work hardening exponent (n)for a stainless steel were determined during the analysis of thedata from a tensile test using a standard tensile specimen. Theflow...
- Q What are the main differences between natural andforced convection flows? In the lab experiments, explain how we diduse one experimental test rig to demonstrate the characteristics ofboth flows. ?
- Q The erosion rate of a streambank is calculated by the excessshear stress equation: e=k(a-c) where e is the erosion rate in m/s,k is the erodibility coefficient in m^3/ N s,...
- Q Given a system of five (5) 3500-lb, 700 feet per minute (fpm)elevator cars. Gearless traction motors are being used for thissystem.  Each car operates approximately 65% of the timeand while...
- Q Air enters a thin-walled, 5-mm diameter, 2-m-long tube at auniform inlet temperature of 100°C. A constant heat flux is appliedto the air from the tube surface. The mean temperature of...
- Q Consider a Bevel Gear Differential used to drive the rear wheelsin an automobile. Assume the input angular velocity is to thecarrier and the output angular velocities drive the left and...
- Q Assume you know that a process is in statistical control. Is ita capable process? Give an explanation for your answer
- Q write down the options of how to find the value of anenthalpy difference for air.Which one is most accurate??
- Q Find the Examples of stability and resilience, except forships.
- Q A certain VOC compound has measured vapor pressures equal to0.1316 psia at 31.65° F, and 0.2034 psia at 44.57° F. Determine theconstants A and B in a Classius-Claperon type equation...
- Q Q1. Explain how (EinScan-SE?) 3D Scanner work ?
- Q Which of the following statements about a real Rankine cycle istrue?Top of Form(A)The entropy of the working fluid increases across everycomponent.(B)The temperature of the working fluid increases across thepump.(C)The pressure...
- Q An air-standard Carnot cycle is executed in a closed systembetween the temperature limits of 350 and 1200 K. The pressuresbefore and after the isothermal compression are 150 and 300 kPa,respectively....
- Q What materials can be used in a gearbox where gears are expected tolive at least 5 years, while operating 8 hours a day, and shaftsare expected to live an infinite...
- Q A certain engine develops an output torque of 1800 + 200sin2??Nm, where ? is the crank angle measured from some datum. Thisengine drives a machine which requires a driving torque...
- Q 1a. The latitude in Ames Iowa is 42 degrees. Most outside wallson homes are 10 feet high. As an energy conscious buildingdesigner, you would like the wall overhang to shade...
- Q Compare and contrast response (how material behaves/respondswhen subjected to a load) and failure (where the material fails orthe parts are damaged) properties and give three examples ofeach.
- Q . A 20 mm diameter sphere made of aluminum alloy 2024 initiallyat a uniform temperature of 500 ºC is suddenly immersed in asaturated water bath maintained at atmospheric pressure. Thesurface...
- Q Water vapor enters a subsonic diffuser at 0.5 bar,175 °C, and 200 m/s. The diffuser inlet is 100 cm2. During passagethrough the diffuser, the fluid velocity is reduced to 50...
- Q Howto calculate the center of gravity of an irregular shaped steelframe. Include all equations and information needed.
- Q For a catapult project I must make a MATLAB code that shouldmake use of the projectile motionequations so for a given input range R (horizontal distance fromthe catapult to the...
- Q Fix the bugs in this matlab program so that it solves.clearclfclctime = linspace(0, 5, 100);m = 1; k = 100; c = 1; delta = 0.2;[period, response] = Exmp(m, k,...
- Q Q1) Identify five Nondestructive Testing methods and theprinciples that govern thoseinspection techniques?
- Q Define Obstacle expansion (or obstacle inflation). Explain thetrade off between Exploration and Exploitation during robotlocalization in a map.
- Q Air flows steadily through a converging-diverging nozzle with athroat area equal to 1.395 in2 , and an exit area equal to 2.79 in2. A normal shock wave stands at the...
- Q 1) Air is flowing steadily through a cooling section where itis cooled from 86 °F to 59 °F at a rate of 0.55 lbm/s. If theaverage COP of the air-conditioner...
- Q You are an engineering consultant hired to verify an elevatordesign. The elevator mass is 500kg and has a maximum occupantcapacity of 800kg. Carbon steel cables with total cross sectionalarea of...
- Q A rigid cylinder of volume 0.025 m^3 contains steam at 80 barand 350o C. The cylinder is cooled until the pressure is50 bar. Calculate the state of the steam after...
- Q A rectangular wing with a NACA 65-210 airfoil section and achord of 6 in is mounted in the Auburn University 2 ft × 2 ft windtunnel, completely spanning the test-section....
- Q 8. The chapter text describes various materials that have beenused to produce casting patterns (i.e., the tooling that is used toproduce molds), including Styrofoam, soft woods, hard woods,epoxylurethane polymers aluminum,...
- Q What is the Force analysis for the genevamechanism?
- Q This is problem 8-7 from El-Wakil’s Powerplant Technology book-- air at 14.696 psia, 40 degF, and with 65 percent relativehumidity enters the compressor of a gas turbine cycle. Thecompressor and...
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