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






2. Length x Width x Height






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






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






5. 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






6. Combustion ignited by spark plug and materials are compressed






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






8. Static - Dynamic






9. Compression-Tension-Shear






10. The branch of science and engineering involving measurement






11. 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






12. 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






13. More compact (size of beer keg) - No valves -Benefits: fewer parts - lower engine weight Problems: seal - lower inertia forces -1 rotar=3 to 4 pistons






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






15. 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)






16. 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






17. Weight/Time






18. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






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






20. 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 (






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






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






23. Exhaust of combustion products






24. Length x Width






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






26. Psi - newtons - pascals






27. Movement along a line (reciprocal or linear motion) -Units: feet and meters






28. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






29. When the moving fluid is a gas






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






31. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






32. Force without machine/Force with machine






33. Rotation may occur






34. Ignition - power stroke






35. What we are studying






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






37. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






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






40. Rotation will not occur - but translation might occur






41. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline






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






43. (Force)(Distance)/Seconds






44. Mass x acceleration






45. Liquid or gas






46. Describes how applied forces bring a body into motion






47. 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.






48. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






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






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