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






2. Applied at an angle or parallel to a surface






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






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






5. Mass x acceleration






6. 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 (






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






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






9. 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






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






11. 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






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






13. Describes how applied forces bring a body into motion






14. A pull on an object






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






16. ...






17. Combustion of fuel mixture ignited by spark plug






18. 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






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






20. The branch of science and engineering involving measurement






21. Length x Width x Height






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






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






24. Force x Distance






25. Air is drawn in






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






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






28. 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






29. 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






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






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






32. A combination of components






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






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






35. Weight/Time






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






37. Combustion ignited by spark plug and materials are compressed






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






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






40. Psi - newtons - pascals






41. Can be applied at a time on an object






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






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






44. 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






45. Compression-Tension-Shear






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






47. When the moving fluid is a gas






48. 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






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






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