What is the main difference between a phosphoric acid fuel cell (PAFC) and a proton exchange membrane fuel cell (PEMFC)?
What will be an ideal response?
The PAFC uses liquid phosphoric acid as the electrolyte whereas the PEMFC uses a solid polymer electrolyte. Both cells use a platinum catalyst although the PEMFC is more tolerant of impurities in fuels. The PAFC also must use corrosion resistant materials because of the acid.
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How many tiebacks is a precast concrete curtain (PCC) wall panel provided with and where are they located?
What will be an ideal response?
A liquid material exerts a pressure or force ____.
A. in all directions B. downward only C. outward and downward D. outward only
What would be the percent horsepower loss while going through the Eisenhower Memorial Tunnel?
Fill in the blank(s) with the appropriate word(s).
?Technician A says that the rpm range of the engine is controlled by the point where the intake valve closes. Technician B says that closing the intake valve later in the compression stroke lowers the effective compression ratio. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B