Test your basic knowledge |

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. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






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






3. Three- dimensional property measured in units of length times length times length =length x width x height






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






5. When fluid is at rest






6. 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 (






7. Work/force or vertical distance/sloping distance






8. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






9. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






10. Mass x acceleration






11. 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






12. 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






13. Describes how applied forces bring a body into motion






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






15. Force/Area






16. 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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17. Ignition - power stroke






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






19. 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






20. Force x Distance






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






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






23. Psi - newtons - pascals






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






25. Exhaust of combustion products






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






27. 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






28. When the moving fluid is a gas






29. ...






30. What we are studying






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






32. Liquid or gas






33. (Force)(Distance)/Seconds






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






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






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






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






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






39. 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






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






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






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






43. Combustion ignited by spark plug and materials are compressed






44. Intake of fuel and air mix






45. 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






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






47. Static - Dynamic






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






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






50. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs