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- 35. A refrigerator consumes 294 KWh of electricity per year. Determine the primary energy requirements in units of MMBTU for the refrigerator assuming: a. The electricity came from a coal power plant with an efficiency of 32%. b. The electricity came from a natural gas plant with an efficiency of 44%.A light bulb has 75% efficiency. How much energy is wasted if the useful output energy of the bulb is 24 J? is the answer... a. 6.0 J b. 8.0 J c. 18 J d. 32 J e. 51J5. A heat engine with a high temp reservoir at 400K has an efficiency of 0.20. What is the max possibletemp of the cold reservoir?
- 6. An engine does 10J of work and exhausts 15J of waste heat. (a) what is the efficiency? (b) If the coldreservoir is at 20°C, what is the minimum temperature of the hot reservoir?An 800-MW electric power plant has an efficiency of 30%. It losses its waste heat in large cooling towers. Approximate how much waste heat (in MJ) is discharged to the atmosphere per second? 240. 560. 800. 1 200. 1 900.10. A gasoline engine has a compression ratio of 6.00 and uses a gas for which ? = 1.40. What is the efficiency if it is operated in an idealized Otto cycle?
- 7. An engine releases 1675 J of energy per cycle and performs 200J of work. What is the thernal efficiency?An engine has a hot reservoir of 520K and a low-temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %4. A heat engine operates between energy reservoirs of 75°C and 450°C. What is the maximum efficiency of this heat engine? Express your answer as a decimal, between 0 and 1. 5. A heat engine is operated between two energy reservoirs at different temperatures, where 10,200[J] of thermal energy flows out of the hot reservoir. If the engine has an efficiency of 0.15, what is the work performed by the engine? Express your answer in Joules.
- A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (16°C) at the ocean's surface and cooler water (4°C) 1,247 m below the surface. What is the maximum possible efficiency of the system? 0.75 % Need Help? Read It Watch It1. What is the efficiency of a steam engine if it absorbed an energy of 2.5 x 10$ J from the boiler and gives up 1.5 x 10ºJ in exhausting during one cycle? Solution: Answer:An engine takes in 600 J and exhausts 450 J each second is running. What is the engine's efficiency?