Test 1 Solutions for Introduction to Thermodynamics | ENGI 2334, Exams of Thermodynamics

Download Test 1 Solutions for Introduction to Thermodynamics | ENGI 2334 and more Exams Thermodynamics in PDF only on Docsity! ENGI 2334 - Introduction to Engineering Thermodynamics - Summer 2012 Test #1, Jane26,20l2 Name Signature Student ID The exam is open textbook only, and no notes, reference or other material are allowed. Calculators are permitted, with no pre-set programs. 1. Two vertical cylinders with pistons, A and B, have their bases at the same level, with a pipe connecting them at their bases. The cylinders contain water (p : 1000 kg/-') and their diameters are D1:0.5 m, and Dn:0.25 m. The mass of the piston in cylinder Ais m1: 5 kg. What should be the mass of the piston in cylinder B if the water level in cylinder A is to be maintained at 0.2m higher than the water level in cylinder B? (25 points) *rth= w K\g: (1A r fkAu a f h As A, Aa ^L =(YI ^ 98(t Dn' '* (,ooa)b'4Fk*tf) I :- ' i(.ael k? 2. Water in a cylinder with apiston is at an initial state of 500oC and 3000 kPa. The piston is springJoaded such that the pressure varies with the specific volume according to the relation P : a * bv, where a arrd b are constants. The water is cooled to temperature Tz:2A0oC where the quality is x2 = 0.5. Determine the values of a and b, and the temperature, and quality if two- phase, at2000 kPa. (25 points) fit ?t frt T'L7o vL o (' , X,r= o,{ i -7 i', = tffs,B l-(u 3 o06 tri)"9 ftt f= zoao b?a = t). o o i ( f6 * (o' tr)(o " iL6L) = a,L)6LlLt6 ff, *6,116(q b ? Iqu6'Lto,o5t\ h + o.o6L+L66 b ) h 5 2786 r A_ = - L31 e( .- (zo oo + LZt)/17 t6 f = o,6gb3 ^t/q T* u- g L,.oso , "T= ZiL'+L o(, o-o8e3*0'aoi(17 =A- = 0r* y- V-ufi -n - \f, +1 = o,8'6V7 o'o47qf