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Unformatted text preview: ID No. MEEN 289 — Spring 2006, Exam 1 K 1” Name
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~______,__4,—m4an 1. Multiple choice problems w01th 2 pts each. Circle the answer that is the most appropriate or
closest (numerically) to your answer. 1. The correct precise answer that should be given when 1.625 is multiplied by 2.3 is C. 3.738 A. 3
3.7 D. 3.7375 2. Which of the following EES expressions will return the correct speciﬁc volume of helium at a
temperature of 100 °C and a pressure of 200 kPa. The unit system is set to SI and the units are set to
kPa and K. A. VOLUME(HeIium,T= 100+273,P=101+200) C. VOLUME(HeIium,T=S60, P2200) B. VOLUME(HeIium,T=100,P=200) VOLUME(Heium,T=373,P=200) 3. The force (in lbf) required accelerate a mass of 3 lbm at 5 ft/s2 is f _ ma
A. 15 0.466 {r1 ‘3'”
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321}wa 6”; 1“ 4. A speciﬁc heat is given as 0.800 kJ/kgK. This is equivalent to A. 0.800 kJ/kg'R C. 0.800 Btu/lbmR 0.800 kJ/kgOC D. 0.444 kJ/kg°C MEEN 289 ~ Spring 2006, Exam 1 Name ID No. 5. What is the quality or state of refrigerant 13421 at —5 °F and an enthalpy of h = 45.45 Btu/lbm? A. Subcooled liquid C. 0.45
@039 D. 0.50
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M. 6. Determine the phase of water at 120 oC and 200 kPa A. Saturated liquid Compressed liquid B. Saturated vapor D. Superheated 7. Which path in the P—V diagram below may correspond to a constant temperature process for an
ideal gas? (A) C. (C) B. (B) D. None of the indicated paths MEEN 289 — Spring 2006, Exam 1 Name ID No.
8. Given the steady mass ﬂow rates of an incompressible ﬂuid to and from a rigid control volume below, find the mass ﬂowrate #1,) I. K r [r . :O~
my? +mc H1319 + M A. 5 kg/s into the system D
5 k tl t v r: “f k? , l r O
g/soutof resysem (553; 1p m 5‘ pm}?
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D. Problem can not be solved since there can be mass accumiilation in the control volume.
1 mc = 7kg / s 9. Which of the following statements is FALSE?
A. Only energy transfer can take place in a closed system.
B. Both energy and mass transfer can take place in an open system. C. Neither energy nor mass transfer can take place in an isolated system. Only mass transfer can take place in a closed system. 10. The density of R134a gas at 400 psia and 179.95 °F in lbm/ ft3 is A. 56.9 @104 B. 21.1 I D. 5.94 MEEN 289 — Spring 2006, Exam 1 Name ID No. 11. Four workout problems worth 20 points each. 1. A body is weighed on a spring scale at a location high above sea level where the value of g is
9.1 m/sz. Its weight is measured to be 70 N at this location. Determine the A. Mass m ofthe body (in kg) at this location. (7 pts)
B. Mass msl of the body (in kg) at sea level. (6 pts)
C. Weight of the body at sea level (take the value of g at sea level to be equal to 9.81 111/32). (7 pts) MEEN 289 — Spring 2006, Exam 1 Name ID No.
D. 2. Consider a hydraulic lift used to lift a mass of 200 lbm (includes mass of crosshatched
frictionless piston). This lift consists of a cylindrical tank having a diameter of 1 ft on which the mass
to be lifted is placed. It also contains a small cylindrical tube of 1 inch diameter that is connected to
the larger tank and the end of this tube is exposed to the atmosphere, as is the pistonmass
combination in the larger tank. An oil having a density of 50 lbm/ft3 is used in this hydraulic lift. A. Determine the value of “h” in equilibrium. B. Now, a piston having a mass of 0.5 lbm is placed on top of the oil surface in the smaller tube. The
diameter of this piston is the same as that of the tube. such that there is no leakage of oil. Find the new
value of “h” when steady state is reached. linch in; Egaﬁm‘ g T1. @tgﬁ.)
——...........r..,.....__._m.._‘ $9 MEEN 289 — Spring 2006, Exam 1 Name ID No. 3. A pistoncylinder system contains water. Initially the system is at quality of x=0.5, T=120 °C, and
volume of V1: 0.5 1113. Heat is added to the system to result in the ﬁnal voltune of V2: 0.6 m3.
Assuming that the piston can move without any resistance determine A. mass of liquid water at state 1 B. mass of liquid water at state 2 C. work done by the system on the surroundings D. Show the process in a PV diagram ‘4
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4. Air ﬂows into a container with a mass ﬂowrate of 1.5 lbm/s through a pipe with inlet area of 5 inz, at T = 540R and P = 14.7 psia. The air stream leaves the container through a pipe with exit area of
4 i112, at T = 500 R and P = 12 psia, and exit velocity of 140 ft/s. Determine
A. The volumetric ﬂowrate in ft3/s at the inlet section
B. The mass ﬂowrate in lbm/s at the exit section
C. Find the mass accumulation rate in the container. LCJF‘ (P be VBWWGl’r‘rc Vac:
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 Thermodynamics, Mass, sea level, MEEN, indicated paths MEEN

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