Explain the importance of gas pressure within a fuel cell.
What will be an ideal response?
The gas pressure inside a fuel cell is one of the most important variables for optimizing operations. It is also one of the most difficult to control given the nature of the gas phase. The various equipment and schemes used to control the internal pressures in a cell, stack, and system can range from nothing more than a small arrangement needing little more than a side-mounted fan to miniplants tied to grid-connected installations.
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____ wrenches have thin heads that make them useful in tight places, where there’s limited access space around the nut or bolt head.
a. Box-end b. Adjustable c. Socket d. Allen
Name a breed of cattle developed in Canada
What will be an ideal response?
Alcohols, methane and organic acids of various kinds often accumulate as a result of ________ decomposition of residues in soil
A) anaerobic B) nitrogen-limited C) abiotic D) acidic E) fungal
With its leads on either side of a switch, a volt meter reads 120 volts. This indicates that:
A) The switch is closed, so voltage cannot pass through. B) The switch is closed, allowing 120 volts to pass through. C) The switch is open, allowing 120 volts to pass through. D) The switch is open, so voltage cannot pass through.