quiz_09 - EML 5104 Classical Thermodynamics, Spring...

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Unformatted text preview: EML 5104 Classical Thermodynamics, Spring 2010 Quiz 8, 24 March 2010 Name (Print): ___________________________________ UF ­ID: ___________________________________ Please sign the honor pledge: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." _________________________________ Signature Only mark one of the multiple choice answers. Use additional paper if necessary. Q1: Give the balanced reaction equation for complete combustion of Butane (C4H10) with the theoretical amount of air (1 O2 + 3.76 N2). (2P) Q2: Steam reforming of Methane is used to produce Hydrogen CH 4 +H 2 O ↔ CO+3H 2 . Assuming all reactants and products are ideal gases, give the equilibrium constant K as a function of molar fractions (yCH4, yH2O, yCO, yH2), pressure p, and reference pressure pref. (2P) Q3: If the pressure is increased, according to Le Chatelier’s principle the equilibrium of the Methane reforming reaction (see Q2) will (2P) a) Shift to the reactants (more reactants) b) Shift to the products (more products) c) Remain unchanged d) Will either shift to the reactants or products depending on the current temperature Q4: Steam reforming of Methane is an endothermic reaction. Therefore: (2P) a) ΔH<0 b) ΔH=0 c) ΔH>0 d) can be smaller or larger than 0 Q5: If the temperature is increased for an endothermic reaction (e.g., steam reforming of Methane), according to Le Chatelier’s principle the equilibrium will (2P) a) Shift to the reactants (more reactants) b) Shift to the products (more products) c) Remain unchanged d) Will either shift to the reactants or products depending on the current pressure Turn page! EML 5104 Classical Thermodynamics, Spring 2010 Q6: Use the Gibbs phase rule to determine the number of degrees of freedom of a system consisting of a solid phase, a gaseous phase, with a total of 4 components (2P) Q7: If the condenser pressure is reduced in an ideal Rankine cycle, the efficiency of the cycle (2P) a) Goes up b) Goes down c) Remain unchanged d) May go up or down Q8: If the boiler/steam generator pressure is reduced in an ideal Rankine cycle, the efficiency of the cycle (2P) a) Goes up b) Goes down c) Remain unchanged d) May go up or down Q9: Draw a T ­S diagram with 2 ­phase region. Indicate an ideal Rankine cycle with superheating. Indicate the states at the entrance of the turbine (1), at the entrance of the condenser (2), at the entrance of the pump (3), and at the entrance of the boiler (4) (2P). Q10: Give two reasons for superheating (2P). Points: _______/ 20 P Turn page! ...
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