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Unformatted text preview: TEST 1 — repeat Fall 2006
Afternoon PROBLEM I (30 points) Outcome 2 Ammonia is contained in a closed rigid container with a volume of 2 m“. Initially,
the pressure and temperature of the ammonia is 'r' bar and 140 “C, respectively. The
temperature drops as a result of heat transfer to the surroundings. Determine a) the temperature at which condensation starts b) the fraction of the total mass that has condensed when the pressure reaches 0.5 bar c) the volume occupied by saturated liquid at the ﬁnal state ot‘0.5 bar PROBLEM 2 (30 points) Outcome 2 A rigid tank contains 5 lbm of a twophase, liquidvapor mixture of water at 260 "F; 3 lbm is saturated vapor and the rest saturated liquid. Heat transfer to the contents of
the tank occurs until the temperature is 350 0F. a) Show the process on a Tv diagram
b) Detemiine the voltune of liquid originally in the tank
c) Determine the ﬁnal pressure in the tank PROBLEM 3 (20 points) Outcome 2 The pressure in an automobile tire depends on the temperature of the air in the
tire. When the air temperature is 25 “C, the pressure gauge reads 210 kPa. If the volume
of the tire is 0.025 m3. determine the pressure rise when the air temperature in the tire
rises to 50 OC. Also, determine the mass of air that needs to be bled off to restore the pressure to its original value at this last temperature. Assume the atmospheric pressure to
be l00 kPa. Iﬂj XL:[ﬂMyz';W/’ . fay/é,“ 3' 3375—ng ' 2/?5'2ﬂ700/{133 ‘ ME? = ( / “1%)” :(/ % iZJ’Mfﬂ/ .~ 5. mg < a
_ L c
. C) “9 :WJ :ﬂ/ﬂfféWS iiiﬂ/ M’ﬁ/xr/gr; :— «av/72;: iii/ﬂ” V = V/ (Hf/s 353/ %/ﬂ5ﬂé .— .35. yﬂj __ ~ 35.35’_ f3 __
747%" 5 '2i7%'ya— W72 14%; afﬂﬁ/ﬂyéy/ F“? v '4 *Q/zﬁﬁﬁa _ 5V . @w/ﬂﬂf/ ..
43 ’27:; ' 'Vﬂ/Zfﬁ/¢fﬂg/ WW 2F. W (am/2M mam} way/é” ...
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This note was uploaded on 04/07/2008 for the course EGN 3303 taught by Professor Smith during the Spring '08 term at University of South Florida.
 Spring '08
 Smith
 Dynamics

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