Mechanical Engineering question and answers for July 31, 2023
- Q Calculate the variation with Tt4 of exit Mach number, exitvelocity, specific thrust. Fuel/air ratio, and thrust specific fuelconsumption of an ideal turbojet engine for compressor pressureratios of 10 and 20...
- Q 3. As a tool experiences crater wear, in general, the deepestpoint in the craterformed on the tool rake face occurs at a distance away from thetool tip,rather than at the...
- Q 15.Why is it not common to have milling cutters with negativeaxial rake angleand positive radial rake angle?
- Q 14. (i) For a turning operation that entails ideal conditions,it is desirable to haveboth the maximum roughness Rt and the machining time reduced by afactorof 2, without altering the spindle...
- Q A compressor, operating at steady-state, increases the pressureof an air stream from 1 bar to 10 bar while losing 4.2 kW of heatto the surroundings. At the compressor inlet, the...
- Q A compressor, operating at steady-state, increases the pressureof an air stream from 1 bar to 10 bar while losing 4.2 kW of heatto the surroundings. At the compressor inlet, the...
- Q 6. The uncut chip thickness for an end-milling application thatentails a cutterwith brazed inserts is 0.025 mm. For coating these tools would youemploy aChemical Vapor Deposition (CVD) or a Physical...
- Q 5. Sketch two views of a turning operation to show that the backrake angle andthe side rake angle correspond to the inclination angle and theeffective rakeangle, respectively.
- Q 1) A prototype disk brake for a bicycle is to be mountedon the hub of the rear wheel, and consists of a pair of pads ofarea 5cm × 1cm which...
- Q A turning operation in the automotive industry relates to thereduction of thediameter of bar stock by 6 mm for about 100,000 components. For aconstantmachining cycle time, would you recommend a...
- Q 1. Considering heat transfer issues, give two reasons toindicate why cuttingfluid applied in the form of a mist performs better in comparisonto a floodapplication.
- Q 1a. Can we delete a drawing view in autodesk inventor? How?1b. Can we adjust the length of centerlines in the draftingmodeof inventor? how?1c. Describe the purpose and usage of the...
- Q What are the differences between air-standard analysis and coldair-standard analysis? What is the tradeoff in using air-standardanalysis vs. using cold air-standard analysis?
- Q Crude oil of density 970 kg.m-3 flows in a pipe of internaldiameter 9 inches and circular section that exhibits a 90° bend inthe horizontal plane. The flowrate of the oil...
- Q 120 kilograms of saturated water at 2.32 MPa pressure is heatedto saturated vapor at same pressure. Determine heat required forthe process.
- Q Refrigerant-134a is throttled from the saturated liquid state at700 kPa to a pressure of 160 kPa. Determine the temperature dropduring this process and the final specific volume of therefrigerant.
- Q A heavily insulated steam turbine operates steadily and issupplied with 1 kg/s steam at 2MPa, 400 deg C. If the outlettemperature is 100 deg C and the turbine has an...
- Q A heavily insulated steam turbine operates steadily and issupplied with 1 kg/s steam at 2MPa, 400 deg C. If the outlettemperature is 100 deg C and the turbine has an...
- Q CFD questionHow does interfacial density relate to drag and saltationmodel?
- Q Explain the failure criteria in 2-Dstress-strain analysis.
- Q Consider a 2-mm-diameter sphere immersed in a fluid at 300 K and1 atm.(a) If the fluid around the sphere is quiescent and extensive,show that the conduction limit of heat transfer...
- Q In a manufacturing system, 5 workers pick parts from a rawmaterials bin. After picking the parts, the workers move torwards acell that is composed of 5 manual turning machines. The...
- Q In a manufacturing system, 5 workers pick parts from a rawmaterials bin. After picking the parts, the workers move towards acell that is composed of 5 manual turning machines. The...
- Q Calculate the weight of steel saved if a 250 mile crude pipeline(class 2 location) operating at 1440 psia MAOP upgrades its steelfrom grade b (35,000 psi) to x-70. 16†Pipeline
- Q i have to plot time and frequency domains and then calculatedamping ratio for the underdamped system using the log decrementmethod then convert the time domain into frequency domain using thefourier...
- Q Liquid at 23 (degrees C) flows at 2 m/s over a smooth,sharp-edged, flat surface 12 cm in length which is kept at 57(degrees C). Calculate h at the trailing edgea)...
- Q How does a commercial ice machine exactly work? Take Hoshizackifor example (MODEL KM-515MWH and MODEL KML-600MWH). They have bothwater-cooled and air-cooled models that make ice. I want to knowhow these...
- Q A brass rod 25.00 mm long and 5.00 mm in diameter extendshorizontally from a casting at 200°C. The rod is in an airenvironment with T∞ =20°C and h=30 W/m2·K. What...
- Q Linear-elastic fracture mechanics method for fatigue lifeestimation is more appropriate for which stage(s) of fatigue?
- Q a.Why might a single crystal ceramic material have differentcoefficients of linear expansion depending on the crystallographicdirection (anisotropy)?b. In metals, thermal expansion and electrical conductivity maybe related using equation the Weidemann-Franz...
- Q A hollow cylinder of ID 0.12 m and OD 0.14082 has a heatgeneration rate of 5 × 106 W/m3.The conductivity of the material is 30 W/mK. The outside surface isinsulated...
- Q When reporting gait and/or kinematics data, authors report acontinuous graph of the average and standard deviation. Researchhow this type of graph is created and write up a tutorial on how...
- Q A mixture of dry air and water vapour is at a temperature of25C. It is under a pressure of 100kPa. The dew point temperature is15C. What is:a) Partial pressure of...
- Q Isooctane is supplied to a four-cylinder spark-ignition engineat 2 g/s. Calculate the air flow rate for stoichiometriccombustion. If the engine is operating at 1500 rev/min, estimatethe mass of fuel and...
- Q Name two sources of renewable energy that you know and one wayof harvesting and storing energy from one of them. Make your ownsketch of the process and label the components...
- Q Whether you are doing area sampling with a large, heavy,high-volume, variable-speed pump or personal sampling with a small,light-weight, lower volume, variable-speed pump attached to theworker’s belt, what two procedures are...
- Q Consider an ideal gas-turbine cycle with two stages ofcompression and two stages of expansion. The pressure ratio acrosseach stage of the compressor and turbine is 3. The air enters eachstage...
- Q 1. Design and check for stability for a square and ground endhelical spring subjected to a maximum force of 1300 N supportedbetween flat surfaces. The deflection of the spring correspondingto...
- Q A spring was compressed by varying load from 100N to 350N. Ifthe spring material is music wire, design the spring specificationsand indicate its factor of safety against fluctuatingstresses.Assume and state...
- Q A rock is dropped from the top of a tall tower. Half a secondlater another rock, twice as massive as the first, is dropped.Ignoring air resistance,they strike the ground with...
- Q 15.33 A spur gear reducer has an 18-tooth pinion driven 1500 rpmby an electric motor and a 36-tooth gear that drives a loadinvolving “moderate shock.†A life of 106 pinion...
- Q what are centrifugal pumps and what is cavitation?
- Q What is the aluminum profile? What is themanufacturing method of aluminum profile? What are the materialsused in the manufacture of the product? Describe them all indetail. Please keep the explanations...
- Q Howwould mechanical engineer involved in plastic recycleprocess?
- Q Explain the meaning and usefulness of the equivalent diameter,for the annular region in a double pipe heat exchanger.
- Q Hydrogen, acting as a van der Waals gas (EOS shown below), iscompressed in an isothermal closed system process from 6.236m3/kgto 0.629m3/kg at 300K. What is the change in specific entropy...
- Q a tapered surface is to be turned on an automaticlathe the work piece is 750 mm long with minimum and maximumdiameter of 100 & 200 mm at opposite ends the...
- Q Determine the carburizing time (in s) necessary to achieve acarbon concentration of 0.44 wt% at a position 1.8 mm into aniron-carbon alloy that initially contains 0.031 wt% C. The surfaceconcentration...
- Q In line-shaft driven product machinery, torsional deflectionsand vibrations of the camshaft due to the time-varying torque ofvarious cams can cause synchronization problems between the variousstations on the machine. We need...
- Q Assume a dimension that a customer is interested in is given byR = x0.5+y. The variables x and y are determined using standardcalibration gage pins, where the nominal value of...
- Q For questions 1, 2, and 3, walk through each question by hand, thenuse the “disp†command in your MATLAB script to display your answerto the screen.1. What is the final...
- Q Determine the roots of f (x) = −12 − 21x + 18x2 − 2.75x3graphically. In addition, determine the first root of the functionwith (b) bisection and (c) false position.For (b)...
- Q 1.Show that the optimal efficiency of a cylindrical friction pumpoccurs when α=-1.02. Calculate the maximum possible efficiency of a frictionpumpNotice: η = Power Attained / Power Expended
- Q Ethyl alcohol flows through a horizontal tube having a diameterof 25 mm. If the mean velocity is 0.18 m/s, what is the magnitudeof the pressure drop per unit length along...
- Q For the ground state of the Harmonic Oscillator and 2D Rigid RotorA. Give the time dependent wave functionB. Determine <x> and <p> for both the HarmonicOscillator and 2D Rigid Rotor
- Q What is the purpose of a pressure relief valve? What is a sequence valve? What is it purpose? What is a pressure compensated flow control valve? What is a servo...
- Q In your own words explain how chain branching affects the amountof crystallinity of PE, the strength of PE, and the elongation ofPE.
- Q Determine the entrance conditions at the hub of an axial flowstator-rotor compressor. The mean-velocity diagram has a flowcoefficient of 0.3 and work coefficient of 0.446. The exit flow isat axial...
- Q Delta Wing Aircraft Specifications(do the necessary assumptions if needed)Wing Area: 585 m2Wing Span: 32 mTaper ratio: 0.019Leading Edge Sweep angle: 65.57°Wing loading: 4070 N/m2Cruise Mach Number: 3Cruise altitude: 22.5 km(L/D)...
- Q Calculate an overall heat loss coefficient for a plate at 50℃, facing up, when exposed to an ambient temperature of 10℃. The plate emittance is 0.88, the dew point is...
- Q for the bourdon tube gauges , how to calibrate the pointer tozero ?
- Q How do you find the specific volume of R-134A at P=700 kPa andT= 120 C? I know it is from the tables but I can't seem to figureout how to...
- Q all journal bearing has a shaft diameter=1.25in and suppports aload of 1200lbf. the bushing is 1.25-in long and has a borediameter=1.25in. shfat speed=1500 rev/min. average filmtemperature=115.4o​F and SAE grade 30...
- Q A 5 MW gas turbine generating set operates with two compressorstages with intercooling between stages; the overall pressure ratiois 9/1. A high pressure (HP) turbine is used to drive thecompressors....
- Q A pair of helical gears is used with the following properties:14.5 degree normal pressure angle, 45 degree helix angle, diametralpitch of 8 teeth/in, 1.5-in face width, and normal diametral pitchof...
- Q An anthracite coal has the following composition: C = 84.7 N =1.5 A= 5.8 H = 2.9 S =0.8 W = 2.7 O = 1.6 Calculate for completecombustion per pound...
- Q Semicolons and ColonsInsert semicolons and colons where necessary in thefollowing sentences. Some sentences, however, may not requireadditional punctuation.1. David, Richard approved the proposal you can start rightaway.2. I spoke with...
- Q Triton Manufacturing Company began June 2016 with 10,000 unitsof inventory in process, 20 percent completed. During the period,50,000 units were completed and transferred to the finished goodswarehouse. Ending inventory consisted...
- Q This is a fluid dynamics problem. specially vortexdynamics.Please, Explain how a secondary flow and vortex turningare related in an open channel flow.please help to me using picture &equation.
- Q -An initially empty canister with volume of 0.2m3 f filled withcarbon dioxide from a line at 1000 kPa, 500K. Assume the process isadiabatic and the flow continues until it stops...
- Q 1. Methane and oxygen exist in a stoichiometric mixture at 500kPa and 298 K. They are ignited and react at constant volume.Combustion is complete.a. Find the heat removed from the...
- Q ThermodynamicsAn insulated piston/cylinder device contains ideal CO2 gas at800 kPa, 300 K, which is then compressed to 6 MPa in a reversibleadiabatic process. Determine the final temperature and the specificwork...
- Q In order to select the correct material to make Intakevalves and Exhaust values of automobile engine.a). List the requirements of service functions and workingconditions of these Intake valves and Exhaust...
- Q 1) Choose a characteristic of turbulent flow below. A) Laminarflow B) Produces kinetic energy C) Viscosity dominates the flowalsbehavior D) The energy will always be potential energy E) Fluidsmoving at...
- Q Please understand my questions:1- what's your knowledge of fields engineer?2- why would you be a field engineer rather than any otherjob?3- what's your definition of petroleum engineering?4- why would you...
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