Question

1 pts An automobile engine consumes fuel at a rate of 32 L/h and delivers 90 KW of power to the wheels. The fuel has a heating value of 44000Kkg and a density of 800 kg/m ( 1m = 1000 L) The thermal efficiency of this engine is closer to: 0.33 0.42 0.29 0.55 0.71 O 0.12 0.21 0.37

Answer 1

Onsuer : Normal Ethery output parer/Breakupner Theroral puner Hoxe, outpeker, is power delivers to aheels = 90 kw poner cbtained by hentin fuel is cuor Thermal power halal Thermal Pemer = my o C PP = Vf x S x cu = 32 Uhr 32X163 ffuel Gr. Celonihavaly uf : volume flow letre in m3/ If densith of fuel in kola uf 3600 If = 8.589x10 - soo kg/h my - Y x 8 g = 8.589 xw x 60 = 711x163 19% my C = 44000 ks (kg x Cv Thermal power = my = 7.10X10x44000 Parmelsmes = 312.88 kW Brake puer .: Thermal ethany 90 312-88 Thomel pener Mo 0.2876 No.29 T