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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. (Force)(Distance)/Seconds






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






3. Length / Time






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






5. One that pushes on an object






6. 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






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






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






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






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






11. 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.






12. 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






13. 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






14. Mass x acceleration






15. 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






16. Describes how applied forces bring a body into motion






17. 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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18. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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19. ...






20. What we are studying






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






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






23. Often a free body has _______ acting on it






24. Work/force or vertical distance/sloping distance






25. Exhaust






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






27. Same pressure - work - volume - Different forces and distances






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






29. Applied at an angle or parallel to a surface






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






31. When the moving fluid is a gas






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






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






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






35. Piston travels up and exhaust valve opens. Combustion by product exhaustion






36. Body in motion (car)






37. 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






38. The magnitude of something in a particular direction






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






41. Combustion of fuel mixture ignited by spark plug






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






43. Length x Width x Height






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






45. A pull on an object






46. What we are not studying






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






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






49. 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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50. 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