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






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. Work/force or vertical distance/sloping distance






4. 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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5. 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






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






7. 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)






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






9. Combustion of fuel mixture ignited by spark plug






10. 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






11. Dimensions and units






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






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






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






15. Combustion ignited by spark plug and materials are compressed






16. 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






17. Psi - newtons - pascals






18. 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






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






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






21. Length / Time






22. 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






23. Compression of fuel mix






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






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






26. Liquid or gas






27. Force x Distance






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






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






30. Rotation may occur






31. 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






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






33. What we are studying






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






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






36. When the moving fluid is a gas






37. When the fluid is in motion






38. The magnitude of something in a particular direction






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






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






41. (Force)(Distance)/Seconds






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






43. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






44. Air is drawn in






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






46. What we are not studying






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






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






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






50. Length x Width