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






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






3. The magnitude of something in a particular direction






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






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






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






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






8. 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






9. 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






10. Force x Distance






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






12. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid


13. Rotation will not occur - but translation might occur






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






15. 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.






16. Work/force or vertical distance/sloping distance






17. Ignition - power stroke






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






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






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






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






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






23. 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






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






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






26. A pull on an object






27. Length / Time






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






29. Applied at an angle or parallel to a surface






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






31. Air is drawn in






32. One that pushes on an object






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






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






35. 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






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






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


38. Psi - newtons - pascals






39. Mass can neither by created nor destroyed - only transformed






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






41. 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






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






43. Rotation may occur






44. Weight/Time






45. Compression-Tension-Shear






46. The branch of science and engineering involving measurement






47. Length x Width x Height






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






49. Combustion of fuel mixture ignited by spark plug






50. Body in motion (car)