33. For a heat engine, if the high temperature end Th= 400 C, what must be the low temperature end to have 15 % thermal efficiency? (Don't forget about conversion!) a. 370 C b. 299 C d. 175 C c. 283 C
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- 5. 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?5. A system consists of a two-phase liquid-vapor mixture of 5 kg of R-134a. One kg is saturated liquid. What is the quality? 6. Given the temperature and specific volume of a two-phase liquid-vapor mixture, how would you determine the specific internal energy? 2When the first law of thermodynamics is applied to a system, the Q and Wstand for what? Select one: A. the heat flow into the system and the work on the system. O B. the heat flow out of the system and work done on the system. C. the heat flow into the system and the work done by the system O D. the heat flow out of the system and the work done by the system.
- A helium gas tank is placed outside for 24 hours during the hot summer season. This process is A. isothermal. B. isobaric. C. adiabatic. D. none of them above. adiabatic.isobaric. none of them.isothermal.4. The first law of thermodynamics states that a. components of a system interact. b. entropy of a closed system always increases. c. closed system always shifts toward disorder or homogeneity. d. Energy is always conserved. 5. According to the second law of thermodynamics, the heat received from a high temperature reservoir by a heat engine operating in a complete cycle a. must be completely converted to work. b. equals the entropy increase. C. converted completely into internal energy. d. cannot be completely converted to work.2. How do you define Zeroth Law of Thermodynamics?
- 6A heat engine takes in 14 kJ of energy and rejects 6 kJ to a low temperature sink. 1. How much work does the engine produce? 2. What is the efficiency of the heat engine?6. An ideal gas expands isobarically from 3 atm from 400 to 600 ml. Heat then flows out of the gas at constant volume, and the pressure and temperature are allowed to decrease until the temperature reaches its original value. Calculate a) the total work done by the gas in the processes and b) the total heat flow to the gas.
- 0. A/ How much energy will be absorbed by 24% heat engine in order to perform 6J of work? B/ How much energy is rejected to the cold reservoir?B. Solve the following problems. 1. A Carnot engine is operated between two heat reservoirs at temperatures of 520K and 300K. What is the thermal efficiency of the engine? 2. A steel ball with a mass of 1 kg rolls down a cliff. Complete the table below. KE (J) ME (J) v (m/s) PE (J) h (m) 100 10 8 6. 4a) If an incandescent light bulb requires 100 units of potential energy to deliver only about 12 units of kinetic energy (in the form of incandescent light), then it has a first-law efficiency of: A. 12% B. 88% C. 100% D. 112% E. 188% b) The above example of an incandescent light bulb loses what percentage of potential energy as heat? A. 12% B. 88% C. 100% D. 112% E. 188%