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2006 중간고사문제 &해답

저작시기 2011.01 |등록일 2011.03.15 한글파일한글 (hwp) | 6페이지 | 가격 2,000원

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열역학 중간고사 자료입니다.

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1. Steam in a frictionless piston-cylinder system with linear spring.
T1 = 120℃, x1 = 0.8 (quality)
T2 = 250℃, P2= 0.3MPa
mp(mass of piston) = 40㎏
A(piston area) = 100㎠
L : cylinder height
L1 = 10㎝, L2 = 20㎝
P0(atmospheric pressure) = 100 ㎪
g(gravitational acceleration) = 9.8m/s2
1) Fs1 = ( )kN
2) W1-2 = ( )kJ
3) m = ( )kg
4) Q1-2 = ( )kJ
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2. Air in a frictionless piston-cylinder system,
V1 = 2000cm3, P1 = 4000㎪ , T1 = 2500K
1-2: polytropic process : PV1.4 = constant
V2 = 20000cm3, P2 = ??, T2 = ??
Cv = 0.718kJ/kgK = constant
1) P2 = ( )kPa
2) T2 = ( )K
3) m = ( )kg
4) W1-2 = ( )kJ
5) Q1-2 = ( )kJ
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3. steady operating Helium Compressor
T1 = 25℃ , P1 = 100kPa
1-2: PV1.5 = const , Q` = -2.5kJ/s
V`(volume flow rate)= 3m3/min
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