Explain the general applications and characteristics of large fuel cell systems.
What will be an ideal response?
Large fuel cell systems are those that supply substantial amounts of electricity to either the grid or to a large complex such as a campus, skyscraper, or factory. They require a major infrastructure to support them, ranging from electrical substations and high pressure and flow rate feed gas lines to operations and maintenance staffs. They generate thousands of kilowatts (megawatts) of electricity. Many supply primary power to a site and these are many times high temperature cells operating constantly. Others serve to balance the power grid itself, coming on to supply power when demand peaks or a particularly large draw occurs and these are generally lower temperature cells such as SPFC (PEM) that can be brought up and then taken back down in a reasonable time and without damaging the fuel cell system with temperature cycling.
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A special wire wheel called an _____ wire wheel is available for high rpm use.
A. enveloped B. encased C. entrenched D. encapsulated
If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a(an) __________
A) Open B) Floating ground C) Short-to-ground D) Short-to-voltage
Name the line type used to define the outline and characteristic features of architectural plan components.
What will be an ideal response?
Plans call for building a brick wall 22 feet long having one hollow pilaster in the middle. If modular standard size brick are used and the pilaster has a width of 2' and projection from the main wall of 8", what is the length of each wall section on either side of the pilaster in feet?
What will be an ideal response?