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






2. 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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3. An indication of kinetic energy of mass at the molecular level






4. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






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






6. 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






7. What we are not studying






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






10. Exhaust






11. Intake of fuel and air mix






12. A pull on an object






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






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






16. A combination of components






17. Combustion of fuel mixture ignited by spark plug






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






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






20. One that pushes on an object






21. Rotation will not occur - but translation might occur






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






23. What we are studying






24. Psi - newtons - pascals






25. Dimensions and units






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






27. Compression of fuel mix






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






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






30. When the sum of all forces and the sum of all moments both equal forces - No movement






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






32. Length x Width x Height






33. When the moving fluid is a gas






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






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






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






37. Mass x acceleration






38. Length / Time






39. 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






40. 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






41. When the fluid is in motion






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






43. 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






44. Force/Area






45. Piston travels up and both plugs are closed






46. Force x Distance






47. Work/force or vertical distance/sloping distance






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






49. Weight/Time






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