POE 1 st Semester Exam Review
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1 POE 1 st Semester Exam Review Vocabulary Matching 1. Actual Mechanical Advantage a. A force that produces or tends to produce rotation or torsion. 2. Efficiency b. A fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work. 3. Friction c. Any of various elementary mechanisms including the lever, the wheel and axle, the pulley, the inclined plane, the wedge and the screw. 4. Fulcrum d. Any source of energy other than fossil fuels that is used for constructive purposes. 5. Ideal Mechanical Advantage e. Ratio of distance traveled by the applied effort and resistance force within a system. 6. Simple Machine f. The fixed point around which a lever rotates. 7. Torque g. The flow of electrical power or charge. 8. Alternative energy h. The net transfer of electric charge per unit of time. 9. Current i. The ratio of the magnitude of the resistance and effort forces applied to a system. 10. Electricity j. The ratio of useful energy output to he total energy input, or the percentage of work input that is converted to work output. 11. Energy k. The resistance that one surface or object encounters when moving over another.
2 12. Resistance a. A condition where there are no net external forces acting upon a particle or body. 13. Work b. A diagram used to isolate a body from its environment, showing all external forces acting upon it. 14. Power c. A mathematical property of a cross section that is concerned with a surface area and how that area is distributed about a centriodal axis. 15. Voltage d. A quantity that has both a magnitude and direction. 16. Electrolysis e. A result of a force moving an object a certain distance. 17. First Law of Thermodynamics f. A support that prevents translation and rotation in a beam. 18. g. A surface or shape exposed by making a straight cut through something at at right angles to the axis. 19. h. The geometric center of an area. 20. i. The law that heat is a form of energy, and the total amount of energy of all kinds in an isolated system 21. j. The opposition that a device or material offers to the flow of direct current. 22. k. The potential difference measured in volts. 23. l The process separating the hydrogenoxygen bond in water using an electrical current. 24. m.. The rate at which work is performed or energy is expended. 25. n. The resultant of a system of force is the vector sum of all forces. 26. o. The turning effect of a force about a point.
3 Multiple Choice 27. Engineers and engineering technologists apply math, science, and discipline-specific skills to: a. solve problems b. make money c. create theories d. add to scientific knowledge 28. communication can be accomplished in oral, written and verbal forms. a. Creative b. Technical c. Persuasive d. Poetic 29. Most mechanisms are composed of: a. gears b. pulley systems c. sprockets d. all of the above 30. Mechanisms are used to redirect within a system by manipulating, speed, and distance. a. energy & time b. force & torque c. energy & force d. none of the above 31. An example of a nonrenewable resource includes: a. fossil fuels b. wind c. electricity d. solar 32. An example of an inexhaustible resource includes: a. fossil fuels b. wind c. electricity d. natural gas 33. Copper is a good conductor because it has: a. no free electrons b. free electrons in its valence shell c. a shiny exterior c. full valence shell 34. create electricity and heat through an electrochemical process that converts hydrogen and oxygen into water. 35. convert light energy into electricity by using photons to create electron flow. 36. can transfer via convection, conduction or radiation.
4 Name: Score: / Problems *Show all knowns, unknowns, formulas, substitutions with units and circle answers. 39. A first class lever, in static equilibrium, has a 30 lb resistance force and 10 lb effort force. The lever s effort force is located 12 inches from the fulcrum. Calculate the distance to the resistance force. 40. A simple gear train consists 3 gears: gear A has 15 teeth, gear B has 5 teeth and gear C has 30 teeth. A is the driver gear. Howe many times will gear A rotate compared to gear D? If 40 ft-lbs of torque is applied at gear A, then what is the output at gear D? 41. Use Ohm s Law to calculate the unknown quantity. Show all formulas and units. a. R = 330 Ohms I =? V = 6 V b. R =? I = 10 ma V = 3.5 V
5 42. Using the laws of circuit theory, solve for R T, I T, V R1, V R2, and V R3. Be sure to put your answer in proper engineering notation and use the correct units. Use Kirchoff's Voltage Law to confirm your results.
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