Quiz_4_Solution

Quiz_4_Solution - J F;~t LoLJ ;5 V~~lc.t~~ ~ La n S era 0...

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Name: Sdu.tO'\ ME 302 Quiz 4 1) (10 pts) An inventor has designed a compressed air engine for an automobile. A tank of compressed air is used to turn an air-powered motor, which provides power to the wheels of the car. The same inventor has also made an air compressor using the same technology as the air motor. The inventor then proposes attaching the air compressor to the output shaft of a compressed air motor so that the tank of compressed air will remain continually pressurized while providing power to the wheels of the car. What do you think about the combined device shown below? Would you invest your money in it? If it is a perpetual motion machine, what type is it (PMM1, PMM2, or PMM3)? You MUST justify your answers and show a control volume of the overall system to receive full credit. ~- -- , - Tank \ . Wwheel - / Ambient Air at b::,~t rn 0,,, -=. ,v1~t (Gir motor CO/'. onl, expcl\ J 1'1:> otN\'O~fheri(. pre~u(e.) Of) d I~ creotlf\j en e~y' ()It 0 r a:fe. ... 'O{. ~~l t4-
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Unformatted text preview: J F;~t LoLJ ;5 V~~lc.t~~ ~ La n S era 0 t;OI"'\ f.. ener~ j--, No) r vo/(J yYJt /r/l)e$t ill ,ot I ond IS PMM1.' 2) (3 pts) True o@: p 8 r Q = ss 3) (3 pts) True or@: For an irreversible heat engine, ni« = 1 -~~ = ~ T for ~('~: lot e. of) IY 4) (4 pts) Heat transferred at a finite temperature difference is always irreversible. Physically explain the one nontrivial situation (Q "* 0) where heat transfer is totally reversible. 1/ 6T ;-5 ;n(;f\I'~~;1Y'Io1 (lit, fjT ~ A-T)-ry Go/:;. at S:y-n fur ked" '1'(",,< k~ c\e(:v"6 :,,<10';' S~ -:: Q (1_ 1..\ ~~~,,:::O if. Q~o "0(' if d- . . J ':t: O or Tt;-T£.-:t. .dl fl. . TH) I~ IN . 5) (5 pts) In terms of cyclic integrals, explain why (8 Q ) is a property, but PdV is not. r rev {or On Y prop e,. ..ry...
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This note was uploaded on 10/04/2011 for the course ME 302 taught by Professor Helum during the Spring '11 term at Penn State.

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Quiz_4_Solution - J F;~t LoLJ ;5 V~~lc.t~~ ~ La n S era 0...

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