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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. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






2. Mass x acceleration






3. Dimensions and units






4. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2






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






6. Can be applied at a time on an object






7. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force






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

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9. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)






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






11. One that pushes on an object






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






14. Piston travels up and both plugs are closed






15. Describes how applied forces bring a body into motion






16. A pull on an object






17. The branch of science and engineering involving measurement






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






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






20. (Force)(Distance)/Seconds






21. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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22. 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






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






24. 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.






25. Rotation may occur






26. Air is drawn in






27. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






28. Often a free body has _______ acting on it






29. Length x Width






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






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






32. If the force needed to operate the machine (input force) is less than the force being opposed or the load being moved (output force) -The ratio of the output force divided by the input force -If the number is greater than one - there is a mechanical






33. Combustion ignited by spark plug and materials are compressed






34. An indication of kinetic energy of mass at the molecular level






35. Air is compressed - work is done on the system






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






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






38. Applied at an angle or parallel to a surface






39. When the sum of all forces and the sum of all moments both equal forces - No movement






40. Static - Dynamic






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






42. ...






43. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






44. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






45. (pi) x (radius)^2






46. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






47. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






48. The magnitude of something in a particular direction






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






50. Length x Width x Height







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