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






2. 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






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






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






5. Applied at an angle or parallel to a surface






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






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






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






9. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






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






11. One that pushes on an object






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






13. Intake of fuel and air mix






14. Body in motion (car)






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






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






17. When the moving fluid is a gas






18. Can be applied at a time on an object






19. 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)






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






21. Ignition - power stroke






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






23. Work/force or vertical distance/sloping distance






24. 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






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






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






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






28. Length x Width






29. A^2+b^2=c^2 - used to calculate vectors






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






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






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






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






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






37. Exhaust






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






39. Compression-Tension-Shear






40. The magnitude of something in a particular direction






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






42. Piston travels up and both plugs are closed






43. When fluid is at rest






44. Combustion ignited by spark plug and materials are compressed






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






46. 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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47. Weight/Time






48. 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






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






50. Force/Area