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Unformatted text preview: MAE 204: Thermo
Exam 1 ~ Part 1 Name: M é; Instructions: 1. 2. Print your name in the space provided.
Carefully read each problem before beginning the problem. Show all work7 partial credit will be given for written work only
Neatness is important for you to get all possible credit. No books, notes, or calculators allowed.
All answers must be circled and have the correct units. If you need extra space, use the back of a page and make a note
that you have continued elsewhere. Unless otherwise stated assume gravity is 9.8 m/sz.
Unless otherwise stated assume atmospheric pressure is lOOkPa. Unless otherwise stated assume no change in kinetic or potential
energy. March 2, 201 1
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a MAE 204: Thermo, Exam 1 — Part 1 Name \A’f/V Page 3
/ Problem 1 (6 points) An ideal gas at a pressure of 50 kPa and a temperature of 300K 1s contained
in a rigid, well insulated vessel of volume 0.5 m3. What temperature will the gas be at if the same
amount of gas at the same pressure is contained 1n a vessel 2 m3 in size? An ideA 3w obeys lair/’2 mlgﬁl! the.» LE MR T...
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in terms of pressures, volumes, and the polytropic constant n. Note that you may not just list the
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—%r km WMNN”W‘M~”__// Problem 5 (2 points) At what point are the saturated liquid and saturated vapor states the same? Tm Qaltng ﬁfamglﬁ MAE 204: Thermo, Exam 1 — Part 1 Name mail? Page 5 Problem 6 (6 points) A substance of a saturated liquid—vapor mixture with a quality of 0.5 un—
dergoes a cycle: ‘ 1. Isobaric process to a saturatedW ngm‘ 2. Isochoric process to a superheated vapor. 3. Polytropic compression while remaining a superheated vapor. 4. isochoric process back to the initial state. On a pressure—volume diagram draw this cycle in relation to the saturation dome and indicate the
amount of work associated with this process. @ MAE 204: Thermo
Exam 1 A Part 2 Name: M € Z Instructions: 1. 2. Print your name in the space provided.
Carefully read each problem before beginning the problem. Show all work, partial credit will be given for written work only
Neatness is important for you to get all possible credit. You may use one textbook and one calculator. . All answers must be circled and have the correct units. . If you need extra space, use the back of a page and make a note that you have continued elsewhere.
Unless otherwise stated assume gravity is 9.8 m/s2.
Unless otherwise stated assume atmospheric pressure is .100kPa. Unless otherwise stated assume no change in kinetic or potential
energy, March 2, 2011
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mass of oxygen usrng: V: C: EQE’Q; m% T”: $QQL F :2 % SSW ﬁb Q? (17% \ngr"
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and a temperature of 40 OC. Heat is added until the speciﬁc volume is V = 0.07m3/kg While the
pressure is held constant. Problem 2(a) (5 points) Determine the temperature of the final state. Qzﬁmjmlhg XPZRQQMBH Ale 14$th 97 gaivs'iil Umm
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Mas s Lfgggig gillgeg  was it: lag as”. MAE 204: Thermo, Exam 1 7 Part 2 Name M 67’ Page 5 Problem 2(C ) (8 points) Using enthalpy determine the heat density required for this p1 ooess Eoeﬂy ASAWLC $3M
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M&V(R%Lie§3+ ,m—I—Cgu—m ($315le ”levj/l) kiwi) MAE 204: Thermo, Exam 1 — Part 2 Name l/Lf/V Page 6 / Problem 3 (25 points) A rigid and well—insulated tank holds 2kg of a solid—vapor water mixture
at —20° and a speciﬁc volume of 452 m3 / kg. An electric resistance heater with an efﬁciency of 90%
is inserted into the tank The heater is plugged into an electrical outlet capable of providing 120V of electricity at 15 amps. Problem 3(a) (9 points) What is the initial pressure and initial quality? we mm. M was a (is; 5&th saws
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minutes? Remember you need to justify your answer. Pl” Fish”) jﬁ‘gﬂk Mn}, {19 Maia? Lauri»,
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