Engineering, 30.08.2019 23:30 Maddy1212
An engine realising a carnot cycle lifts a mass of 500 kg, while 0.5 mj of heat is transferred at constant temperature of 700 k from a thermal reservoir to the cycle. heat is rejected from the cycle to another thermal reservoir at constant temperature of 400 k. (a) calculate the height to which the carnot engine lifts the mass. (b) calculate the height to which the mass is lifted by a real engine realising a cycle with irreversibil ities with an efficiency lower by 10% than the carnot efficiency of the engine in (a)
Answers: 1
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
Answers: 3
Engineering, 04.07.2019 18:10
During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 19:20
Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3
Answers: 2
An engine realising a carnot cycle lifts a mass of 500 kg, while 0.5 mj of heat is transferred at co...
Advanced Placement (AP), 30.04.2021 16:50
Arts, 30.04.2021 16:50
Mathematics, 30.04.2021 16:50
Mathematics, 30.04.2021 16:50
Chemistry, 30.04.2021 16:50
History, 30.04.2021 16:50
Mathematics, 30.04.2021 16:50