25. Hydrogen Fuel Cells can be classified as a technology that is sustainable. T
ID: 2087865 • Letter: 2
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25. Hydrogen Fuel Cells can be classified as a technology that is sustainable. True/False) Batteries 26. Batteries and Gasoline have approximately the same energy content per unit mass. (True/False) 27. Sodium-sulfur batteries can provide tens of megawatt hours of stored energy and have been combined with some large-scale wind power projects. They can be recharged 9 times more often in their lives than Lithium-lon batteries and are 40 times less expensive. The reason they are not used in small scale projects is: a. b. c. d. Sulfur is a dangerous chemical and not safe for unregulated use Sodium-Sulfur is a scares commodity and not readily available for mass production The operating temperature of a Sodium-sulfur battery is too high for small scale projects The outgassing of sodium-sulfur batteries requires significant infrastructure for containment. 28. The internal resistance of Lithium lon batteries increases with both cycling and age. (True/False) Other forms of energy storage 29. An advantage of compressed air storage is that it can be used and reused indefinitely. True/False) 30. The principal disadvantage of compressed air storage is the energy storage capacity per volume is substantially less than that of chemical batteries. True/False) 31. Flywheels are used extensively as a energy storage mechanism. Their principal use is for: combined with Wind Power systems to provide power during periods without wind combined with conventional power generation systems to ensure the quality of the delivered power when there are small duration fluctuations to either demand or power a. b. c. store potential energy for maintenance periods in power systems at major utilities 32. Flywheels store about the same amount of energy per unit volume as do batteries. (True/False)Explanation / Answer
True. Hydrogen cell is sustainable, because it doesn't cause any pollution, also hydrogen can be obtained by the electrolysis of water which is easily available and recyclable. Rhe exhaust of this cell is also water.
26. False. Gasoline has more energy content in it. But the efficiency of conversion of energy into mechanical work is more in electric driven vehicles.
27. C is correct
The operating temperature? of this cell is around 300-350°C . So this cell is unsuitable for small scale use.
28. True, there can be increase in internal resistance of a battery due to ageing and cycling because it leads to the reaction of electrolyte with the active components & self degradation of materials.
29.True. It is a method to store energy and use it whenever required.
30. False. It can store large amount of energy & can be readily increased.
31. It is generally combined with conventional power generation system to ensure continuous delivery of quality power. Mainly Incorporated to manage frequency.
32. False. Amount of Storage of energy in flywheel depends upon the fluctuations.
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