Problem 1.Historical data is collected
from an assembly process that consists of 5 operations. Determine
the Rolled-Throughput Yield, Normalized Yield, Normalized Defects
per Unit, and Total Defects per Unit (TDPU), given the following
historical production data:
Operation |
Opportunities per Unit |
Units Produced |
Defects Recorded |
Build Rotating Group and Inspect |
10 |
851 |
75 |
Install Rotating Group in Housing and Install Fittings |
7 |
1202 |
72 |
Perform Functional Test |
5 |
943 |
82 |
Clean and Paint with Final Inspection |
3 |
894 |
70 |
Install Pulley and Labels |
4 |
1200 |
88 |
In: Mechanical Engineering
List the processes in each Rapid-prototyping class??
1- Subtractive.
2- Additive.
3- Virtual.
In: Mechanical Engineering
What is the therotiacal And The expertmatla heat transfer cofficnent for heat exchanger in my case shell and tube
Therotical ?
formual ??
expermantial ?
formula ?
I am uisng LMTD method
In: Mechanical Engineering
A model aircraft in a wind tunnel with a wing area of 0.9 square meters and a chord of .24 meters is subject to a sea level standard airflow at 130 m/sec. The zero-lift moment about the center-of-gravity is measured as – 7.8 N m. At a different angle of attack, the moment about the center-of-gravity is measured as 13.5 N m with a lift of 2,650 N.
(A)Calculate the value of the moment coefficient about the aerodynamic center, and the location of the aerodynamic center (relative to the cg).
(B) Lead is added to the tail so that the center-of-gravity is shifted aft by 25% of the chord. Calculate the moment about the center-of-gravity with a lift of 3,000N.
In: Mechanical Engineering
A rigid 0.1 m3 container holds 1 kg of water, initially at 25?C. Calculate the theoretical minimum work required to increase the water temperature to the point where the water exists as a single phase. The environment temperature is 25?C.
In: Mechanical Engineering
Calculate the peak cooling load from an EAST facing wall. No interior or exterior shades, no floor carpeting , medium construction
Windows: ¼ in double glass with air gap and aluminum frame
Window area = 300 ft2
Wall: 4-in Concrete + R-5 Insulation+ ½ in. gypsum wall board
Gross Wall Area = 1200 ft2
Location: Miami, Florida
Indoor Temperature = 70 oF
In: Mechanical Engineering
4. Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 12.0 MPa, 520C and expands to 0.6 MPa. The steam is reheated to 440C before entering the second turbine, where it expands to the condenser pressure of 0.006 MPa. Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 200C and 8.0 MPa, and condensate exits as saturated liquid at 2 MPa. The condensate is trapped into the open feedwater heater. Steam extracted from the second turbine at 0.4 MPa is also fed into the open feedwater heater, which operates at 0.3 MPa. The stream exiting the open feedwater heater is saturated liquid at 0.3 MPa. The net power output of the cycle is 100 MW. There is no stray heat transfer from any component to its surroundings. If the working fluid experiences no irreversibilities as it passes through the turbines, pumps, steam generator, reheater, and condenser, determine (a) the thermal efficiency, (b) the mass flow rate of the steam entering the first turbine, in kg/h. (Turbine and pump isentropic efficiencies 100% & Create a table of all values)
In: Mechanical Engineering
list electronic manufacturing processes with its applications.
In: Mechanical Engineering
A 2-in diameter jet of water having a velocity of 30 ft/s is deflected parallel to a curved vane. The jet flows freely in the atmosphere in a horizontal plane. Calculate the x and y forces exerted on the water by the vane. Defelction is 90 Degrees
In: Mechanical Engineering
A gaseous mixture of 25% CO, 25% CO2, 25% H2 and 25% H20 is brought to a temperature T and 1atm. Equilbirium composition of the gas mixture is determined by the following reaction
CO2 + H2 = CO + H20. Calulate the equilbirium composition of the gaseous phase at 700K and at 1500K. Given G at 700K is 14kJ and at 1500K is -9.6kJ
In: Mechanical Engineering
A 100-lb driver and a 2000-lb tractor lift 900 lb of gravel. Create a MATLAB program that will:
Determine the reaction at each of the two rear wheels and two front wheels.
The shift has changed and a new driver dumped some of the gravel. Ask the user the weight of the new driver and the weight of the gravel left in the tractor.
Calculate the new reaction at each of the two rear wheels and two front wheels.
Provide the user with output that describes the difference between a and c.
In: Mechanical Engineering
Consider a Carnot heat engine cycyle executed in a closed system (piston-cylinder device) using 0.01848695 kg of stem as the working fluid. It is known that the maximum absolute temperature in the cycle is three times the minimum absolute temperature, and the net-work output of the cycle is 90 KJ assuming no kinetic and potential energy changes. If the steam changes from saturated vapor (state 3=h_g) to saturated liquid(state 4=h_f) during heat rejection (process3-4) determine
a) the thermal efficiency of this Carnot Cycle
b) the head addition during the process 1-2 (isothermal expansion)
c) the heat rejection during process 3-4 (isothermal compression)
d) the temperature of the steam during the heat rejection process.
(a hint: use energy balance equation, H=U+PV, and h_g -h_f = h_fg
In: Mechanical Engineering
Briefly describe, probably with the aid of an illustration, the injection molding process. For full credit, state what general category of polymer it is used for.
In: Mechanical Engineering
How to calculate overall fuel economy of hydraulic hybrid vehicle? Know that fuel economy formula is litre per used over distance travelled. How to calculate the fuel used for both ICE and hydraulic system
In: Mechanical Engineering
Specify suitable machine screws to be installed in a pattern of four, equally spaced around a flange, if the clamping force between the flange and the mating structure is to be 26.7kN. Recommend a suitable tightening torque for each screw if each of them is to be stressed to 75% of its proof strength
In: Mechanical Engineering