Describe some of the aspects that make AFC systems different from SPFC (PEM) systems.
What will be an ideal response?
There are several aspects of AFC systems that make them fundamentally different from SPFC (PEM) systems. The electrolyte can be in a liquid state and thus can be recirculated, or it can be in a solid form capable of being used in any orientation. The hydrogen fed to the anode produces more water at the cathode, which is useful in space applications where water is needed by astronauts or in fuel cell water heating/cooling loops. AFC systems can operate at lower temperatures to take advantage of commercial opportunities at those temperatures, or at higher temperatures in order to take advantage of efficiency improvements offered by higher pressures and temperatures.
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a. 14 days b. 21 days c. 28 days d. 30 days
How much vacuum must a fuel oil pump produce to move fuel oil 20 ft horizontally?
A) 20 ÷ 10 = 2 in of vacuum B) 20 × 1 = 20 in of vacuum C) 20 ÷ 5 = 4 in of vacuum D) 20 ÷ 2 = 10 in of vacuum
A ________ duct system uses several large ducts leaving the main plenum that branch off into smaller ducts as they get closer to their destination
A) closed loop system B) central plenum system C) reducing radial duct system D) perimeter loop system
____________________ is a twisting type of force.
Fill in the blank(s) with the appropriate word(s).