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
For a base motion system described by:
mx''+ cx'+ kx = cY?b cos ?bt + kY sin ?bt
with m = 100 kg, c = 50 N/m, Y = 0.03 m, and ?b = 3 rad/s, find largest value of the
stiffness k and that makes the transmissibility ratio less than 0.75.
In: Mechanical Engineering
Naphthalene is commonly used as a repellent against
moths to protect clothing during storage. Consider a 1 cm diameter
spherical naphthalene ball hanging in a closet at 25 oC. The
density and vapour pressure of naphthalene at 25 oC are 1100 kg/m3
and 11 Pa, respectively and mass diffusivity of naphthalene in air
at 25 oC is 0.61 x 10-5 m2/s.
a. consider the variation of diameter with time,
determine how long it will take for the naphthalene to sublimate
completely.
b. If instead of being stored in a closet, the
naphthalene is exposed to dry air flowing at a velocity of 2 m/s.
Both the naphthalene and the air were kept at 25 oC. It is observed
that 12 g of naphthalene has sublimated in 15 min. Determine the
mass transfer coefficient and the flux for mass transfer from
naphthalene.
In: Mechanical Engineering
Explain with your own words, how turbulence increases heat transfer.
In: Mechanical Engineering
If a candle is lit in a spacecraft without gravity...
Question 8 options, pick one:
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a. The candle will light, but not burn very well, as no natural convection flows develop. |
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b. The candle will not light. |
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c. The candle will light and burn better than on Earth, as the natural convection flows are not held down by gravity. |
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d. The candle will light and burn just like on Earth, as natural convection flows are independent of the gravity. |
In: Mechanical Engineering
Materials Science
What are the frequently observed problems of using polymer materials in cars ?
In: Mechanical Engineering
What are designs/devices being used today for finger joint replacements (MCP) *include about 3 or more devices*
1. Description of each device (mechanics involved)
2.FDA class
3. Which current design is the most used today
Please include citations from the information obtained
Thank you
In: Mechanical Engineering
In: Mechanical Engineering