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Sustainability Engineering and Practice

by: Amiya Haley

Sustainability Engineering and Practice EE 80

Marketplace > University of California - Santa Cruz > Electrical Engineering > EE 80 > Sustainability Engineering and Practice
Amiya Haley
GPA 3.99


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Class Notes
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This 4 page Class Notes was uploaded by Amiya Haley on Monday September 7, 2015. The Class Notes belongs to EE 80 at University of California - Santa Cruz taught by Staff in Fall. Since its upload, it has received 52 views. For similar materials see /class/182336/ee-80-university-of-california-santa-cruz in Electrical Engineering at University of California - Santa Cruz.

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Date Created: 09/07/15
1What is the source of energy for the followings Hydropower Water cycle which is powered by sun Wind Sun Ocean wave energy Wind Tidal wave Gravitational energy of Earth and Moon 2Which energy source is economically more expensive to harness X Thermoelectric X Ocean Energy c V nd d Hydropower Both TE and Ocean are expensive This questions is not well de ned since the price changes a lot depending on the technology so I accept both answers 3Which one makes more contribution to today s world energy consumption a Solar b Thermoelectric c V nd X Hydro 4ln theory which one has the potential to meet our energy needs X Solar b geothermal cHydro dwind 5Which one has more energy per gram a Coal b Chocolate Chip Cookie X H 6 Which one is cheaper X Coal b Natural Gas cOil dAAA battery 7A limitation for all electric automobiles is X low energy density per battery b batteries explode more readily than gasoline c electric energy is not useful for autos d electric motors are less ef cient than gasoline motors 8 Hybrid vehicles run on a electric and solar power b solar power and gasoline 0 electric power and gasolineX d nuclear power and gasoline one gram of TNT 9 Write down each ofthe followings is a unit of power or energy a Calorie Energy b Horsepower Power 0 Energy d Energy e Watt Power 10 which one is correct a Hydrogen has more energy than Gasoline per volume b Hydrogen mixed with air is explosive X 0 Hydrogen is too expensive d There are plenty of free H2 in the atmosphere 11 which one is correct b Russia has the largest amount of fossil fuels in the world 0 We will run out of fossil fuel reserves in less than a century d Coal produces less 002 compared to oil 12 What is the difference between kinetic and potential energy Kinetic energy of an object is the energy that it has due to its motion Potential energy is the stored enegy 13 why a wire gets hot when current passes through it Give one example in which we can use this effect to our bene t Give another example in which this effect is a disadvantage Electrons moving through a wire collide with the atoms and this friction makes the wire hot We use the effect to our benefit for example in a toaster heaters iron There is lot ofenergy lost due to this for example in transmission lines 14 Which one is not correct a Earth is a giant magnet b Earth has a large electric eldX c Earth has a gravitational field which holds the atmosphere 15Which one is correct a in electricity same poles repel but in magnetism they attract each other b there is no monopole in electricity c if we put a magnet inside a coil electric current produces You should move the magnet inside othenNise nothing happens ic l m 16 Compare highsolid and lowsolid wind turbines point out to three advantagesdisadvantages Look at the lecture slides 17Recent increase in the wind power cost can be contributed to a The weakening of US dollars b Rise in material costs 0 Turbine and component shortage d All ofthe aboveX 18 how much is the speed of the molecules Same as the speed of sound 19State the second law of Thermodynamics The followings are all the same and they are all 2nd law Entropy ofan isolated system tends to increase You can t extract heat energy without a temperature difference It is impossible to convert heat completely into work in a cyclic process Heat always goes from the hot side to the cold side 20 l have 02 gas inside a storage tank a ifl increase the temperature pressure in creases X b ifl let a little bit of gas to go out pressure inside the tank increases 0 if I decrease the pressure temperature increases 22 A machine is working with gasoline based engine It is rated 10 horsepower Calculate how much gasoline in liters is required for the machine to run for 1 hour Here are the facts that you know Gasoline burns at 257 degree Celsius Energy density of the Gasoline is 32 MIliter 1 horsepower 745 W aCalculate the energy that the machine consumes in one hour P10hp745 kW Ept745 kWh bCalculate the maximum efficiency of a gasoline engine eff 1 TcTh 1 300 room temperature in K 530 257273 043


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