Which of the following energy conversion devices convert heat into work? Select one: O a. Evaporators O b. 1. C Engines O c. Condensers O d. Electrical generators

A gas furnace has an efficiency of 75%. How many BTU will itproduce from 1000 BTU of natural gas.

Thermo review I cannot solve the last part of this question- thank you! A heat engine with a thermal efficiency of 45% rejects 1000 kJ/kg of heat to a low temperature sink. d) A Carnot heat pump operates between 273 K and 313 K, determine its Coefficient of Performance.

Which of the following are correct and valid for the Kelvin-Plank statement? O a. Any device O b. Kelvin- Planck O c. It is possible for any O d. No heat engine can have a thermal O e. Kelvin- Planck O f. It is impossible O g. It is impossible for any device O h. It is impossible that statement statement to construct to construct of the second law is device that a device that a device that violates of the efficiency of 100 second law is the that operates in a cycle and produces no effect other than Kelvin- operates in a cycle and produces no effect other than operates negative statement, and a operates on a cycle to receive heat from a single reservoir Planck percent, or as for a positive statement, and a positive on a cycle to receive heat statement power plant to operate, the working fluid also violates negative statement the from a statement the transfer the transfer single reservoir and Clausius cannot be can be of heat from and of heat from a lower- temperature body to a higher-…

Question 6 Compare the carbon emissions per MJ to heat household water using the following two energy systems: a) A 25% efficient coal-fired power plant delivering electricity to a 99% efficient electric water heater. Assume LHV carbon intensity of coal is 25.8 gC/MJ. b) A new 50% efficient natural gas-fired combined cycle power plant to a 99% efficient electric water heater. You must calculate the LHV carbon intensity of natural gas. Assume 100% methane and ideal conditions. Assume 5% losses in electrical transmission lines and 90 MJ of fuel input to each system.

On a windy day, a camper feels colder as compared to a day at the same temperature when there is no wind. Which of the following heat transfer mechanisms explains this result?   a. Convection   b. Radiation   c. None of the above   d. All of the above   e. Conduction

2. What is one disadvantage of hydroelectric energy? A. It does not work if we don't have coal as a fuel. B. It doesn't work if it is not windy. C. It doesn't work if we don't have rivers or moving water nearby. D. It doesn't work if we don't have efficient combustion chambers. 3. What is the work of penstock in hydroelectric power plants? A. A place behind a dam where water is stored B. Reduce the water hammering effect in pipes which can cause damage to pipes. C. Long pipe that carries the water flowing from the reservoir towards the power generation unit D. Is an enlarged body of water to store water temporarily to meet load fluctuations. 4. Hydroelectric power plants have very............. A. Low installation cost B. Low running cost C. Short time to erection the station. D. High fuel charges 5. Power plant without pondage is classified as a kind of. A. Pumped storage power plant B. Run-of-river power plant C. Storage plant D. Steam power plant 6. In pumped storage power plants,…