Exam3 - 1. What is your email ID? Answer Right Points...

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1. What is your email ID? Answer Right Points Earned:0/0 Correct Answer: Your Response: 2. What is the physical meaning of coefficient of performance? (2 Points) A. It is the amount of work needed to produce one unit of heat B. It is the amount of work required to move one unit of heat between the reservoirs C. It is the amount of heat needed to produce one unit of work D. It is the amount of heat moved between the reservoirs for every unit of work done Refer to screen 8 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: D Your Response: D 3. When a heat pump is used to heat a house in winter, how is the Coefficient of Performance affected as the outside temperature drops? (2 Points) A. it may become negative B. it increases C. it decreases D. it stays the same Refer to screen 8 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: C Your Response: C 4. Which one of the following is true about a geothermal heat pump? (2 Points) A. Its operating costs are high for its usage in the long run B. It provides reduced cost or free electricity C. It saves energy but it is bad for the environment D. It requires less maintenance Refer to screen 21 in 'Lesson 8b - Cooling and Heating' Wrong Points Earned:0/2 Correct Answer: D Your Response: B
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5. What is the name given to the weatherization process used in sealing cracks in windows, doors and walls? (2 Points) A. Painting B. Caulking C. Insulating Refer to screen 33 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: B Your Response: B 6. Which one of the following items is used in a passive solar heating system? (2 Points) A. A Geothermal Heat Pump B. Flat Plate Collectors C. Photo-voltaic Cells D. South facing windows Refer to screen 30 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: D Your Response: D 7. A solar collector’s efficiency increases as ______. (2 Points) A. the sun rises B. useful energy delivered increases (insolation remains constant) C. insolation increases (useful energy delivered remains constant) D. the sun sets Useful energy delivered increases. Based on the equation: Collector’s Efficiency = Useful energy delivered/insolation on collector*100, and there fore if the useful energy delivered increases, the collector’s efficiency will increase. Refer to screen 29 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: B Your Response: B 8. Flat plate collectors are usually placed on the roof or on the ground where there is sunlight. Such collectors are classified as _______. (2 Points) A. Passive Systems B. Hybrid Systems C. Active Systems Refer to screen 26 in 'Lesson 8b - Cooling and Heating' Right Points Earned:2/2 Correct Answer: C Your Response: C
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9. What happens to the high temperature, high pressure refrigerant after it comes out of the compressor of a heat pump (heating mode)? (2 Points) A. It evaporates in the coil, absorbing heat from the inside B. It condenses in the coil, absorbing heat from the inside
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Exam3 - 1. What is your email ID? Answer Right Points...

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