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Mechanical Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Length / Time






2. Varies by location (on earth) - distance (from earth) - and mass (of planet)






3. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






4. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






5. Allows comparison between different measuring systems and units - Necessary to market internationally






6. A combination of components






7. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force

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8. Mass can neither by created nor destroyed - only transformed






9. A^2+b^2=c^2






10. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






11. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






12. Combustion of fuel mixture ignited by spark plug






13. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






14. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






15. When the work done by the effort exceeds the work done by the load - the load...






16. Tells us how fast work is done - varies with time (more power is needed to do work in less time - and less power is needed to do work in more time) =Fd/s -Units: USA: ft- lb/s SI: watts (J/S)






17. Intake of fuel and air mixture - compression of mixture by piston






18. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






19. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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20. The magnitude of something in a particular direction






21. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






22. Weight/Time






23. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






24. Piston travels up and both plugs are closed






25. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width






26. Often a free body has _______ acting on it






27. External Combustion engine -Only used in factories and plants (not used in cars)






28. ICE generates electricity for electric battery -Electric motor turns wheels






29. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






30. The force simple machines use to do work on a single load or against a single force






31. (pi) x (radius)^2






32. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






33. Intake of fuel and air mix






34. Describes a physical property of anything - What we are measuring






35. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






36. Translation (slide) -Rotate -Slide and Rotate Together






37. Length x Width x Height






38. Static - Dynamic






39. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






40. Exhaust of combustion products






41. A^2+b^2=c^2 - used to calculate vectors






42. When the moving fluid is a gas






43. Body at rest or is in equilibrium (wall)






44. What we are not studying






45. Mechanics is an application of math that describes how forces affect a body






46. The branch of science and engineering involving measurement






47. Describes how applied forces bring a body into rest or equilibrium






48. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






49. ...






50. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N