Mechanical Engineering question and answers for July 20, 2023
- Q Compare the phase angle obtained from the free response and thephase angle obtained from the harmonic response in physical meaningand explain their importance.
- Q Explain the advantages and disadvantages of the following fourmethods when calculating the harmonic response.1. method of undetermined coefficients2. a graphic method3. complex number method4. Laplace transformation
- Q Design a steam power cycle that can achieve a cycle thermalefficiency of at least 40% under the conditions that all turbineshave isentropic efficiencies of 80% and all pumps have isentropicefficiencies...
- Q Suppose you own some land next to a 50 MW wind farm located onColorado’s Front Range. Your land has a fantastic cliff/ridgelinewith an elevation difference of 250 m. Evaluate whether...
- Q Water flows at 112°C through a steel pipe (k=90 W/m °C) whichhas a 6 cm inside diameter and 8cm outside diameter. Such that, hi=346 W/m2 °C and ho =6.0 W/m2...
- Q Consider a circular (cylindrical) pin fin attached to a flatplane with the following properties:k = 237 W/mC (thermal conductivity)L = 100mm (length)r = 2mm (radius)T_b = 80 C (temperature at...
- Q What are the various methods used for comparison during theevaluation of concept? Explain briefly.
- Q Explain what you understand by the word configurationdesign?
- Q g)When at least 50% copper material is alloyed with..............................., ……………. material is obtainedh)Alloys with the highest strength / weight ratio ……………… areused in prosthesis and implant productioni)…………… used in coating...
- Q In your first assignment as a new engineer at a large jet enginemanufacturer, you are part of a team investigating a new generationof lightweight turbine engines for regional jet liners....
- Q What is torque wrench and why it is used in oil rigs
- Q Write real life application of HYDRAULIC PRESSURE CONTROL VALVE-REDUCING VALVE OPERATION
- Q The optical Tachometera- Can the SIS optical tachometer be used to determine thedirection of rotation?b- If number of slots in the disc is changed what effect would thishave on the...
- Q Shows a new process in which 0.0100 kg of methane (an ideal gas)is compressed from a pressure of 0.100 MPa and a temperature of20.0 °C to a pressure of 10.0...
- Q A counterflow, concentric tube heat exchanger used for enginecooling has been in service for an extended period of time. Theheat transfer surface area of the exchanger is 5 m2, andthe...
- Q Design a concentric tube heat exchanger (in co-currentconfiguration) to heat 1000 cm3/ min of water from 30oC to 45oCflowing in the shell, using water at 65oC flowing in the tube....
- Q Prob. 4-68 A piston–cylinder device contains2.2 kg of nitrogen initially at 100 kPa and 25C. The nitrogen isnow compressed slowly in a polytropic process during which PV^1.3 =constant until the...
- Q A cylinder contains ethylene, C2H4, at 1.536 MPa, -13oC. It isnow compressed in a reversible isobaric (constant pressure) processto saturated liquid. Find the specific work, heat transfer andentropy generated.
- Q A strip of elastomer 1 cm×1 cm×10 cm is stretched to 25 cmlength at T =25C, a stress of 1.5 MPa being required(a) Assuming a tetrafunctional crosslinking mode, how many...
- Q The theory of rubber elasticity and the theory of ideal gasdynamics show that the two equations, G = nRT and PV = n'RT, sharecertain common thermodynamic ideas.What are they?
- Q a) Define the following terms:i) Calorific Valueii) Volumetric Percentage with respect to air compositioniii) Gravimetric percentage with respect to air compositioniv) Stoichiometric Ratiob) In combustion chemistry, state why the usage...
- Q . A disposable coffee cup (including a lid) may be regarded as apolystyrene cylinder, diameter 50mm, height 80mm and thickness2.5mm. The base and lid may be regarded as 2.5mm thick...
- Q 1)What is the difference between the closed center Dc valve and theopen center Dc valve2) what is the function of the Needle valve with By-passcheck
- Q Give me an introduction to the study of polymer of materials?
- Q An ideal four stroke Otto cycle engine has 6 cylinders and adisplacement of 4 Liters. It has a compression ratio of 8.5:1. Ifthe mean effective pressure is 4000 kPa when...
- Q A ½†diameter UNC, SAE Grade 8, bolt with rolled threads ispreloaded to 70% of its proof strength when clamping a 2.75†thicksandwich of solid steel. Find the safety factors...
- Q What is creepCreep failureMaterials of creepExample of creepDesign of creep
- Q LetX,Y and Z be the following matricesX=[1 10 42 6;5 8 78 23;56 45 9 13;23 22 8 9]Y=[1 2 3;4 10 12;7 21 27]Z=[10 22 5 13]1. Using single...
- Q A .05 wide journal bearing supporting the loads on a 1 inchshaft just meets the Trumpler’s design criteria for a FACTOR OFSAFTY OF 2.05. The bearing satisfies all the other...
- Q 3. Assume an annulus of inner radius r1 and outer radius r2. Theinner surface is at T1, the outer surface at T2, T1 > T2. Assumeheat transfer between the surfaces...
- Q an undulated surface that is designed to reduce friction byeliminating wear particles from the sliding interface. Theinterface is subjected to normal force N. The sliding speed is solow that the...
- Q A piston cylinder device containing 0.5 kg of water has initialvolume of 0.5L. The device starts and goes through a Carnot cycleand generates 500.3 kJ work. If the maximum temperature...
- Q A 24-tooth spur gear is to drive a 12-tooth spur gear. For both gears, the diametral pitch is 24 tooth/in. The gears are cut on the 20° full-depth involute system....
- Q Given that the pressure coefficient Cp distribution over a2-dimensional slenderbody of chord c is described by Cp = -3(1-x/c) on the upper surfaceof the body andCp = (1-x/c) on the...
- Q An experiment on tethered mine motions is to be conducted infresh water in a wave tank. The mine is a sphere of 5cm diametermade of polystyrene (weight assumed negligible). The...
- Q A rivet is to be inserted into a hole. A random sample of nequals 15 parts is selected and the hole diameter is measured. Thesample standard deviation is millimeters. Is...
- Q List two different types of AC split-phase motors and brieflyexplain the basic theory of operation of these motors in terms ofhow they will start the motor.
- Q Question 12 Needs Grading With the ans wer page provided 1)Define the neutral axis of a bearo under going bending stress 2)Draw a fiber-s tresses diagram for the I-bean QuestionWhat...
- Q II. Preventive Maintenance1. What is preventive maintenance?=2. Give at least 5 defects on each category.Metal Parts                    Rubber, Fiber, Plastic, Glass fiber1.                       ...
- Q Name some of the reasons for the commercial importance of powdermetallurgy technolog
- Q ThermodynamicsIf you use a number from a table can you please show me apicture from what table you use because that's what I'm mainlyconfused about1. (ans:159.50)Saturated water vapor at 14.85...
- Q Shallow drawing is defined as a cup drawing where the cup heightis less than or equal to ________________ the diameter of thecup.½1¼1 points   QUESTION 17Clamping can be kept on the...
- Q QUESTION 13Bend allowance is provided in a bending operation to account forincreased length due to applied stresses.TrueFalse1 points   QUESTION 14A cylindrical object when located by a V-block arrests 4 degreesof...
- Q Principle of momentum and linear momentum: A penguin inside abox (10 Newtons) ascends the inclined plane (Ï€ / 3 Radians)completely smooth due to an impulsive force that gives it aninitial...
- Q QUESTION 10In metal cutting, the application of cutting fluid decreases thecoefficient of friction thereby improving the machiningefficiency.TrueFalse1 points   QUESTION 11Increasing the rake angle of the cutting tool significantlyreduces the power...
- Q Plot the shear strain and the shear strain rate as functions ofthe shear angle, for several tool rake angles. Describe yourobservations.
- Q Search for the thought experiment called “Maxwell’s demon†andsummarize its importance regarding the second law of thermodynamicsin your own words in a half a page long essay. Add the referencesat...
- Q In CExercise 8.1 A word is said to be “abecedarian†if the lettersin the word appear in alphabetical order. For example, thefollowing are all 6-letter English abecedarian words.abdest, acknow, acorsy,...
- Q Essay about fire sprinkler in your own words.
- Q A car’s radiator is a heat exchanger with 2 kg/s of hot waterentering at 100 C and leaving at 60 C with a pressure of 200 kPa.Air flows across the...
- Q 0.5 kg of R12 are contained in a piston/cylinder and has aquality of 75% and a temperature of 0 C. Heat is transferred atconstant pressure until the R12 is a...
- Q PLEASE ANSWER ALL1. Calculate the molar enthalpy of combustion at 25?C and 1 barpressure of a gas of volumetric analysis 12% H2, 29% CO, 2.6% CH4,0.4% C2H4, 4% CO2, and...
- Q ANSWER ALL1. A quantity of coal used in a boiler had the followinganalysis: 82% C; 5% H; 6% 0; 2% N; 5% ash. The dry flue gasanalysis showed 14% CO2...
- Q 1.Determine following conversation(1) Define 'Decibel (dB)'(2) Define 'time constant'(3) Define 'Hall effect' and Writes it's principle andrepresentative Use(4) Defne 'SI(International Systems of Units)'(5) Characteristic of 'Operational Amplifier' (more than 3)(6)...
- Q  A.The process most widely used to make fully-dense parts in metal or polymer is…?Group of answer choicesa. Powder Bed Fusion - liquid phase sinteringb. Electron-beam meltingc. Sheet Laminationd. Powder Bed...
- Q Â What is easier: Homogeneous or heterogeneous nucleation? Why?What does an Isothermal Transformation (IT) Diagram tell us?How do nucleation rates and diffusion rates influence the shape of the IT Diagram?What do...
- Q Directional drilling is much more than simply selecting a wellpath and hole angle. It includes selecting the most appropriatesurvey techniques, defining the best control tools, researchingapplicable government regulations, and gathering...
- Q 1.Discuss the possible sources oferrors (at least two) in Brinell hardness measurements.2.why is it necessary to maintain P /D2 ratio of 30 for ferrous materials and 10 for non-ferrousmaterials is...
- Q explain with sketches the different types of cams andfollowers
- Q explain and elaborate the various types of gear trains
- Q Explain the velocity ratio of epicyclic gear trains is obtainedby tabular method
- Q What goes in the Polynomial box and the LTI box in the simulink model?
- Q A pair of gears with 25?, full-depth, involute teeth transmits125 hp while the pinion rotates at 2500 rpm. The diametral pitch is4, and the quality number is A9. The pinion...
- Q IE 672 Research ProjectYou will be required to research a topic relevant to industrialquality control and summarize this research in a brief report and apresentation to the rest of the...
- Q Several geothermal power plants are in operation in the unitedstates and more are being built since the heat source of ageothermal plant is hot geothermal water which is “free energy.â€...
- Q A normal shock wave propagates through stagnant air at 300K and100kPa with a Mach number of 1.2. What is the post shock flowvelocity in the lab frame of reference and...
- Q (a) Show that for logarithmic oxidation, the rate of oxidegrowth dy/dt is inversely proportional to the time for largereaction times. (b) Then show that the oxidation rate approaches 0for a...
- Q An ideal turbofan operates at 11,000m with a free-stream Machnumber of 0.85. Considering the following design inputs:Bypass ratio:?= 8Fan pressure ratio:?F= 1.6Compressor pressure ratio:?c= 25Fuel heating energy:hPR= 43,500kJ/kgTotal temperature downstream...
- Q A urethane elastomer is selected as an artificial heart valvematerial. You wish to calculate the maximum theoretical strain(strain endurance limit) the material can withstand forever. Thismaterial has a threshold fracture...
- Q Q4. State whether the following are true orfalse with a brief explanation (1-2 sentences).(i) Given a control volume with one inlet and two exits, the twoexits must have identical mass...
- Q A shell and tube type of heat exchanger with one shell pass andtwo tube passes will be designed to provide the given heat transferrate Q(kW) to cool hot water by...
- Q A fuel consists of a mixture of gases the composition of whichis CO -20%, C2H2 - 35%, H2 45 % by volume. Determine thestoichiometric air-to-fuel ratio by mass. (10.6)
- Q In a vertical high temperature wall with high prandtlnumber,write down the governing equation for natural convectionoutside the wall. Using scale analysis of the governing equations,estimate the ratio of hydrodynamic and...
- Q bending moment of 4 kN m is found to cause elastic failure of asolid circular shaft. An exactly similar shaft is now subjected toa torque T. Determine the value of...
- Q A horizontal shaft of 75mm diameter projects from a bearing and,in addition to the torque transmitted, the shaft carries a verticalload of 8 kN at 300 mm from the bearing....
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