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Alternative Energy Systems II MAE 16-650-487 Quiz I-Cover Page Alternative Energy Systems II Quiz I February 19, 2015 1:40 – 3:00 pm This is a CLOSED book and CLOSED NOTES exam. You will have 80 minutes to complete the quiz. You must print your name on the every page of the exam on the location marked “Name: ___________” All pages must be stapled together. If you require additional sheets for work, obtain sheets from the instructor. Additional sheets must be stabled with the exam. The Rutgers Honors Code is in effect. NO cell phones may be used during the quiz. Name (print): __________________________________ ID #: ____________________ Problem Points Multiple Choice (32) Short Answer/Short Problem (28) Problem 1 (30) Problem 2 (30) Total Points (120) Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 2 | P a g e Multiple Choice (40 points total) Circle the answer that most appropriately answers the question. 1. Potential energy is a. Energy that is stored in the bonds of atoms and molecules. b. Energy that is stored in compression springs. c. The movement of energy through a substance. d. The movement of charged electrons through a wire. e. Both a. and b. f. None of the above. 2. Some example of renewable energy resources include: a. Solar, geothermal and nuclear. b. Geothermal, wind, biomass and nuclear. c. Biomass, hydroelectric, fusion, and solar. d. Solar, geothermal, ocean, hydroelectric and biomass. e. None of the above. 3. The energy sectors are often divided into several categories such as: a. The industrial sector, which can include homes and malls; and the commercial sector, which can include manufacturing facilities. b. The industrial sector, which can include facilities and equipment used for manufacturing and construction; and the residential sector, which can include homes and apartments. c. The residential sector, which can include homes and apartments, and the commercial sector, which can include manufacturing facilities. d. None of the above. Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 3 | P a g e 4. A power supply provided voltage and current as depicted in Figure 1. If the period, phase angle, and time are 20 seconds, 30 and 10 second. The instantaneous power, Pinstan is a. Pinstan = 0.11 Watts b. Pinstan = 1.10 Watts c. Pinstan = 0.025 Watts d. None of the above 5. A power supply provided voltage and current as depicted in Figure 1. If the period, phase angle, and time are 20 seconds, 30 and 10 second. The average power, Pavg is a. Pavg = 0.173 Watts b. Pinstan = 0.031 Watts c. Pinstan = 0.35 Watts d. None of the above 6. Use of alternating current (AC) in transmission of electricity through the electrical grid takes advantage of a. Electrical generators that generate AC naturally. b. Low voltages to reduce energy loss through transmission. c. Transformers that require alternating current to operate. d. a., b. and c. are true. e. Both a. and c. are true. f. None of the above. 7. Base load capacity may be supplied from Figure 1 Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 4 | P a g e a. Hydroelectric power plants. b. Nuclear and coal-fired plants. c. Geothermal plants. d. All of the above. e. None of the above. 8. The amount of electricity that can be generated from a hydroelectric plant is primarily determined by a. The transformer used in the grid. b. The thickness of the transmission cables in the grid. c. Whether the generator is AC or DC. d. The change in head and the flow rate of the fluid. e. None of the above. 9. The types of turbines most used in hydroelectric systems include a. Impulse turbines. b. Francis turbines. c. Kaplan turbines. d. All of the above. e. None of the above. 10. In a turbomachine where: ?1 = 3.75 ? ? , ?2 = 7.50 ? ? , ?1 = 4.80 ? ? , ?2 = 4.41 ? ? , ??2 2 = 8.7 ? ? ??? ??1 2 = 3.0 ? ? , the following statements are true. a. The device is a pump. b. The device is a turbine. Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 5 | P a g e c. The dynamic effect is the dominant effect in this device. d. The static effect is dominant effect in this device. e. Both a. and d. are true. f. Both b. and d. are true. Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 6 | P a g e Problem 1 (30 points) The velocity components for a turbomachine is provided in Figure 1. This turbomachine runs at 20 rad/sec with a flow rate of 1 m3/s. The density of the water, = 1000 kg/m3. The blade angle at the inlet is 55. The inlet absolute velocity is in the radial direction, and exit absolute velocity leaves at 30 to the rotor. The inlet and outlet flows are in the radial direction and the inlet and outlet radii are 150 mm and 500 mm respectively. The radial axes are depicted in Figure 2 for the inlet and outlet. a. Construct the velocity triangles. b. Determine the inlet and outlet widths, W1 and W2. c. Is this device a pump or turbine? Provide calculations to support your answer. d. Calculate the power from this device. e. Calculate the torque and change in head of the device. Does the static of dynamic effect dominate in the device? f. Is this an impulse of reaction device? Figure 2 Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 7 | P a g e Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 8 | P a g e Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 9 | P a g e Problem 2 (30 Points) A hydroelectric facility extracts power from a reservoir at an elevation of 800 m that discharges into a tailrace at an elevation of 265 m. The penstock is 1400 m long and 0.8 m in diameter, and connects the reservoir to the tailrace. Minor losses are K = 3 and C = 1500, and the pipe roughness is = 0.035 mm. Assume the dynamic viscosity of water is equal to 1.14E-3 N-s/m2. The rotational speed of the system is 125 RPM. a. Determine the power extracted by the turbine if the flow rate is 2 m3/s and the efficiency is 0.90. b. Calculate the change in head and torque of the system. c. Calculate the specific speed using customary units. d. Use Figure 3 to determine the appropriate type of turbine to be used for this system. Is the turbine a reaction or impulse turbine? Figure 3 Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 10 | P a g e Alternative Energy Systems II Name: ______________________________________ MAE 16-650-487 11 | P a g e Sample questions are attached. It’s a test will provide us the questions by 19th 03 PM and need the solution by 04 PM EST last two problems in the sample pdf are to