Lesson 3 - Quiz_ EGEE 102_ Energy Conservation and Environmental Protection (SP17-UP)

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Pennsylvania State University *

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102

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Apr 3, 2024

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2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 1/6 Lesson 3 ‐ Quiz 1 28 11:59 25 12 1 22 12 1 28 11:59 7 20 Minutes 1 18 23 / 25 1 29 12:05 . : 23 / 25 1 28 9:17 18 ( ) . Remember that once you start the quiz, you cannot stop the timer. If you leave the quiz, the timer keeps running. You must finish in 20 minutes. Feedback for this Quiz (along with your responses and the correct answers) will be made available after the deadline for this Quiz.  1 / 1 1 Which one of the following is true about energy conversion devices? Total Energy Input = Total Energy Output Total Energy Input = Useful Energy Output Total Energy Input = Energy Dissipated to the surroundings Total Energy Input = Efficiency X Total Energy Output Total energy = useful energy + waste energy. Refer to section 3.2: Energy Conversion Devices. 1 / 1 2 Approximately what percentage of input electrical does an incandescent light bulb convert into visible light? (1 point) 5% 20% 40%

2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 2/6 90% Most of the electrical energy is lost in the form of heat in an incandescent light bulb. Refer to section 3.3: Energy Efficiencies. 1 / 1 3 What is the form of useful energy output in the case of a TV? Radiation Mechanical Thermal or Heat Chemical A TV converts electrical energy into radiation (the pictures that we see). Refer to section 3.2: Energy Conversion Devices. 1 / 1 4 What is the form of useful energy output in the case of a lawn mower? Mechanical Thermal or Heat Radiation Chemical A lawn mower converts chemical energy from the burning of fuel into mechanical energy (rotation of blades). Refer to section 3.2: Energy Conversion Devices.

2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 3/6 1 / 1 5 Energy output must be equal to the input. (1 point) True False First law of thermodynamics states that Energy output must be equal to the input. 0 / 2 6 A power plant converts chemical energy into what type of energy at the end? Electrical Mechanical Chemical Thermal In a power plant, fuel (chemical energy) is converted into electrical energy with several intermediate steps. Refer to section 3.8: Example of Power Plant Operation. 2 / 2 7 A turbine is the most efficient component in a power plant. False True

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2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 4/6 Turbine, being a heat engine, is the least efficient component. Refer to section 3.8: Example of Power Plant Operation. 3 / 3 8 The following step efficiencies apply to the use of gasoline in a car: Crude production: 94%, Refining 86%, Transportation 97%, Engine efficiency 23.5%. What is the total efficiency of the process? (3 points) 3 % 75.12 % 18.43 % 18427478 % Overall Efficiency of a system is the product of step efficiencies. Please refer to section 3.9: Calculating Overall Efficiency. 3 / 3 9 The flame temperature in an automobile engine is 1029 °C, and the exhaust is emitted at 73 °C. What is the Carnot efficiency of the engine? (3 points) 73.43 % 26.57 % 92.91 % 7.09 % Use Carnot efficiency formula and temperatures in Kelvin. Please refer to section 3.7: The Carnot Efficiency.

2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 5/6 2 / 2 10 If the energy input of a system is 99 calories and its output is 59 calories, what is the efficiency of the system? (2 points) 67.8 % 79 % 59.6 % 40 % 40.4 % System Efficiency = (useful energy output) / (total energy input) * 100. Please refer to section 3.3: Efficiency of Energy Conversion Devices. 4 / 4 11 The useful output from a heat engine is 230 cal. The energy that is wasted is 5672 J? What is the Carnot efficiency of the engine? (4 points) 14.55 % 85.45 % 82.97 % 17.03 % Efficiency = ((useful energy output) / (useful energy output + waste energy output))*100. Note: Use units consistently. Please refer to section 3.3: Efficiency of Energy Conversion Devices. 4 / 4 12

2017. 1. 28. Lesson 3 - Quiz: EGEE 102: Energy Conservation and Environmental Protection (SP17-UP) https://psu.instructure.com/courses/1811567/quizzes/3160326 6/6 The flame temperature in an automobile engine is 1651 °F, and the exhaust is emitted at 223 °F. What is the Carnot efficiency of the engine? (4 points) 74.22 % 86.49 % 67.65 % 148 % Use Carnot efficiency formula and temperatures in Kelvin. Please refer to section 3.7: The Carnot Efficiency. : 23 / 25

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