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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 x Width x Height






2. Dimensions and units






3. 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






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






5. ...






6. 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






7. 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






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






9. 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






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






11. What we are not studying






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






13. Force/Area






14. 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 (






15. Force x Distance






16. Applied at an angle or parallel to a surface






17. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied






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






19. 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






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






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






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






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






24. One that pushes on an object






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






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






27. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






28. Combustion ignited by spark plug and materials are compressed






29. Air is drawn in






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






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






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






33. Fuel is injected and combusts due to temperature of compressed air






34. 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.






35. Describes how applied forces bring a body into motion






36. 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






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






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






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


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






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






42. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






43. 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






44. Compression-Tension-Shear






45. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute






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






47. Can be applied at a time on an object






48. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






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






50. Length x Width