An automobile engine consumes fuel at a rate of 22 L/h and delivers 55 kW of power to the wheels. If the fuel has a heating value of 44,000 kJ/kg and a density of 0.8 g/cm3, determine the efficiency of this engine. Hint, Qa= mass of fuel * heating value. Draw and label the P-V and T-S diagrams.

1. A Carnot engine requires 35 kJ/sec from the hot source. The engine produces 15 kW of power and the temperature of the sink is 26°C. What is the temperature of the hot source? The answer is 523.25 K, show the complete solution and draw a diagram.

During a steady flow process, the pressure of the working substance drops from 180 psia to 30 psia, the speed increases from 210 fps to 1050 fps, the internal energy of the open system decreases 30 Btu/lb, ad the specific volume increases from 2 to 10ft^3/lb.Heat loss is 20 Btu/lb. Determine the horsepower for 12 lb/min mass flow. Ans. 66hp

1. Compared to gasoline, hydrogen has (A) higher energy density per unit volume and per unit mass (B) higher energy density per unit volume but lower energy density per unit mass density per unit mass (C) lower energy density per unit volume but higher energy (D) lower energy density per unit volume and per unit mass 2. A new hydroelectric power plant proposed for the Mississippi River near St. Louis is advertised as "delivering 438,000 megawatt-hours of renewable electricity to the region annually". What is the average power output of the plant? (A) 50 MW (B) 1.2 GW (C) 438 GW (D) 438 MW 3. A car accelerates from 0 to 60 miles/hour in 6 seconds. What is a good estimate of the power output of the engine? (A) the mass of the car divided by 60 miles (B) the chemical energy of the gasoline consumed during the acceleration (C) the thermal energy produced by the engine during the acceleration (D) the final kinetic energy of the car divided by 6 seconds