Discuss the reasons why hydrogen is liquefied and the benefits associated with this effort.
Explain how a fuel cell produces electrical current.
What is double-layer technology?
Select one:
a. two activated-carbon electrodes are immersed in an organic electrolyte
b. an internal combustion engine
c. an electric motor or motors
d. none of the above
Describe the fuel cell that is best suited for automotive applications and explain the reasons why.
In: Mechanical Engineering
An ideal diesel engine has a compression ratio of 20
and uses air as the working fluid. The state of air at
the beginning of the compression process is 95 kPa and 200C. If the
maximum temperature in the cycle
is not to exceed 2200 K,
Determine:
a) The thermal efficiency, and
b) The mean effective pressure, and
Assume constant specific heats for air at room temperature.
In: Mechanical Engineering
How to calculate the efficiency for the different thermal energy storage mediums like 1)Water 2)Water-Glycol mixture 3)Mineral Oil 4)Synthetic Thermal fluid 5) Molten inorganic salts 6)Molten Metals 7) Solid Storage like concrete.
In: Mechanical Engineering
This is for a GIS class working with ArcGIS and ArcMap. I don't know how to approach this.
You can define the coordinate system in three main ways. That is using the Select, Import and New options. Briefly describe how each are different.
In: Mechanical Engineering
Why would higher levels of atmospheric humidity increase corrosion on carbon steel yet not affect titanium?
In: Mechanical Engineering
(a) What is the difference between turning and milling? What is the difference between peripheral milling (slab milling) and face milling? (b) What are the main parameters in describing the profile of a thread? How to cut threads on a lathe? (c) Describe the differences between electrochemical machining (ECM) and elctrodischarge machining (EDM).
In: Mechanical Engineering
(a) Describe the process steps in sand casting? Compare to die casting, what are some major advantages and disadvantages of sand casting?
(b) Describe the process steps in investment casting?
(c) Describe the process of hot-chamber and cold-chamber die casting. What are the most attractive features for each process?
In: Mechanical Engineering
How linear Velocity and acceleration, and angular velocity and acceleration depends upon the engine rotation angle?
In: Mechanical Engineering
(a) Describe the steps in conventional powder metallurgy shaping process. What are the advantages and disadvantages of this process? (b) How does the fabrication of thermoplastic polymer differ from the processing of thermosetting polymer? (c) What is the heat affected zone in welding? Why preheating is sometime performed in welding?
In: Mechanical Engineering
(a) Bulk deformation processes include rolling, forging, extrusion and drawing. Describe each process. (b) What is the main difference between hot working and cold working? List at least two advantages and two disadvantages of cold working. (c) What is the neutral axis and what is springback in bending process?
In: Mechanical Engineering
In: Mechanical Engineering
Hyrdaulic jack for lifting articulator trailer conceptual design sketch. NOTE: THE OPERATOR MUST JACK FROM OUTSIDE THE TRAILER
In: Mechanical Engineering
What is a patch, or micro strip, antenna and how does it work?
In: Mechanical Engineering
how to find surface temperature of the flat plate which is subjected to air flow from one side and constant temperature on the other side using Ansys fluent ?
In: Mechanical Engineering
The moon has a very low average atmospheric pressure of 3x10-15 bar (1 bar = 100,000 N/ m 2) and a gravity of 1.62 m/s². Assuming that the density of oil is 0.93 g/cm3, calculate the reading on a manometer of: (a) The atmospheric pressure of the moon in meters of oil (head) (b) The atmospheric pressure of the moon in meters of mercury (head), assuming mercury has a relative density of 13.6.
In: Mechanical Engineering