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






2. Piston travels up and both plugs are closed






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






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






5. Force without machine/Force with machine






6. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


7. (pi) x (radius)^2






8. Psi - newtons - pascals






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






10. Dimensions and units






11. Static - Dynamic






12. What we are studying






13. Compression of fuel mix






14. Weight/Time






15. Describes how applied forces bring a body into rest or equilibrium






16. Describes how applied forces bring a body into motion






17. (Force)(Distance)/Seconds






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






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






20. The magnitude of something in a particular direction






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






22. 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


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






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






25. Rotation may occur






26. Length x Width






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






28. Applied at an angle or parallel to a surface






29. 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






30. 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






31. Length / Time






32. 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






33. 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






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






35. What we are not studying






36. Combustion of fuel mixture ignited by spark plug






37. Ignition - power stroke






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






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. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






41. Exhaust of combustion products






42. A^2+b^2=c^2






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






44. Mass x acceleration






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






46. Describes a physical property of anything - What we are measuring






47. 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






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






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






50. Body in motion (car)