Directions: Answer all the following questions below (1-15) , put a…
Question Answered step-by-step Directions: Answer all the following questions below (1-15) , put a… Directions: Answer all the following questions below (1-15), put a detailed explanation per number, I will rate it helpful. Thank you very much. 1. What do we call an engine that uses thermal energy? A. physical engineB. heat engine C. electrical engine D. hydraulic engine 2. A combustion engine can convert thermal energy to ______________. A. chemical energyB. solar energy C. mechanical energy D. electrical energy 3. Which of the following is an example of an Internal combustion engine? A. steam engineB. natural gas power plant C. coal-fired powerplant D. petrol engine 4. In a four-stroke cycle of a gasoline engine, which one ignites the air/fuel mixture and combust making temperature high? A. piston B. spark plug C. cylinder D. intake/exhaust valve 5. What do you call a thermal energy which is discarded or not converted into useful work? A. thermal efficient B. waste heat C. power D. usable energy 6. In a four-stroke cycle of a gasoline engine, which best describes the Power stroke? A. The intake valve opens, allowing the cylinder to receive the fuel-air mixture as the piston moves downward. B. The piston moves up, compressing the fuel-air mixture. C. The spark plug at the top of the cylinder causes the mixture to ignite and combust making its temperature high. With this increase in temperature, the pressure inside the cylinder increases causing the piston to go down and perform mechanical work. D. The combusted gases are pushed out of the opened exhaust valve through an upward motion on the piston. The intake valve opens and the cycle repeats. 7. What is the right formula in computing the thermal efficiency of an engine? A. E= (1 – ) x 100% B. E= (1 – ) C. E= ( ) x 100% D. E= (1 – ) x 100% 8. A car engine receives 620 J of energy from combustion. What is the efficiency of this engine if it loses 434 J by heat in the exhaust? A. 15% B. 20% C. 25% D. 30% 9. What is electricity? A. a fundamental form of energy observable in positive and negative forms that occurs naturallyB. It is an electric current or power. C. It is the continuous accumulation of charge or dynamically as a current. D. All the above. 10. The unit of measurement for energy. A. watt-second B. watt-hour C. kilowatt-second D. kilowatt-hour 11. It raises the voltage so electricity can travel long distances. A. power plant B. step-down transformer C. step- up transformer D. residences 12. He discovered the relationship between electricity and magnetism. A. Benjamin Franklin B. Michael Faraday C. James Watt D. Hans Christian Oersted 13. This device converts mechanical energy to electrical energy. A. generator B. conductor C. power source D. transformer 14. Electricity is generated at a___________. A. transformerB. petrol station C. power source D. neighborhood 15. How can you save electricity at home? A. Clean your fridge and avoid opening it longer than necessary. B. Turn off the lights when not needed. C. Regularly maintain air-conditioners. D. All the above Note: Answer all questions above. Thank you. Science Physics PHYSICS 775 Share QuestionEmailCopy link Comments (0)
