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. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






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






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






4. 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






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






6. Rotation may occur






7. Intake of fuel and air mix






8. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






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






10. Mass x acceleration






11. Often a free body has _______ acting on it






12. Dimensions and units






13. Can be applied at a time on an object






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






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






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






17. ...






18. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






19. Psi - newtons - pascals






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






21. 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






22. Describes how applied forces bring a body into motion






23. Piston travels up and both plugs are closed






24. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






25. Ignition - power stroke






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






27. Weight/Time






28. (pi) x (radius)^2






29. Work/force or vertical distance/sloping distance






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






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






32. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






33. When the moving fluid is a gas






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






35. Exhaust of combustion products






36. 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






37. One that pushes on an object






38. Length / Time






39. 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






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






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






42. Length x Width






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






44. What we are not studying






45. Static - Dynamic






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






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






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






49. Air is drawn in






50. Force without machine/Force with machine