Exam answers

Exam 1, Fa22-23

2. (a) 225 K, (b) 6.26 kJ, (c) 37.3 kJ, (d) 859 K
3. (a) 409 kJ/kg, (b) 111°C

Exam 1, Fa17-18

1. (b) 40 kJ
2. (b) 79.6 kJ, (c) 39.8 kJ, (d) 161 kJ
3. (d) 192 kW

Exam 1, Fa18-19

1. (e) 45 kJ (f) 0.825 kJ
2. (b) 5.37 m³, 120°C (c) 292 kJ (d) 0.624 kJ/K
3. (a) 6.17 kg/s (b) 405 kJ/kg (c) 500 kW

Exam 1, Fa17-18

1. (b) 40 kJ
2. (b) 79.6 kJ, (c) 39.8 kJ, (d) 161 kJ
3. (d) 192 kW

Exam 1, Fa13-14

1. (a) 1304 kJ/kg, (c) 86.2%
2. (a) 0440 kJ/kg out, (b) 17.4 kJ/kg in (c) 8.32 kJ/kg

Exam 2, Fa22-23

1. (b) w_1→2 = 0, q_2→3 = 283 1833 kJ in, w_3→1 = 83.2 106 kJ in, (c) η = 0.34 0.41
2. (a) 14.1 kmol/s (b) 53.4 kW/K

Exam 2, Fa18-19

1. (b) mf_CH4 = 0.205, mf_O2 = 0.795, M_mix = 26.6 kg/kmol
2. (a) 350 K (b) 54.2 kW/K
3. (a) 280.6°C, (b) W_in,31 = 6.2 kJ; (c) 4.87%

Exam 2, Fa17-18

1.  
2. (a) 2.34 kPa, (b) 17.4 kW, (c) 884 kW (e) 43.6% (f) 90%
3. (a) y_CH4 = 0.333, (c) i. 0.312 kJ/kg-K, iv. -13.38 kJ/kg-K

Exam 2, Fa14-15

1.  
2. (a) 0.275 kg/s (b) 51.6 kW, (c) 5.16
3. (b) 299°C, (c) 5.31; (d) w_1-2=0, w_2-3,out=200 kJ/kg, w_3-1,in=140 kJ/kg, q_3-1,out=140 kJ/kg, (e) 29.8%