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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. Weight/Time






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






3. Piston travels up and both plugs are closed






4. Rotation will not occur - but translation might occur






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






6. 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






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






8. 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






9. One that pushes on an object






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






11. Combustion of fuel mixture ignited by spark plug






12. 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






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






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






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






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






18. Force without machine/Force with machine






19. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






20. Length x Width x Height






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






22. 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






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






24. 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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25. A pull on an object






26. The magnitude of something in a particular direction






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






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






29. 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






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






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






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






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






34. When fluid is at rest






35. Describes how applied forces bring a body into motion






36. (Force)(Distance)/Seconds






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






38. Body in motion (car)






39. 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






40. Length x Width






41. When the moving fluid is a gas






42. Intake of fuel and air mix






43. Movement along a line (reciprocal or linear motion) -Units: feet and meters






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






45. A combination of components






46. 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 (






47. Compression-Tension-Shear






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






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






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