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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. Air is drawn in






2. Weight/Time






3. 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






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






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






6. Body in motion (car)






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






8. Rotation may occur






9. Force/Area






10. 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.






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






12. 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






13. Dimensions and units






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






15. 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






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






17. Exhaust of combustion products






18. Mass x acceleration






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






20. Piston travels up and both plugs are closed






21. ...






22. 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






23. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






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






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






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






27. Compression of fuel mix






28. Work/force or vertical distance/sloping distance






29. Combustion of fuel mixture ignited by spark plug






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






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






32. 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






33. What we are not studying






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






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






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






37. Compression-Tension-Shear






38. Can be applied at a time on an object






39. Length x Width






40. (pi) x (radius)^2






41. Psi - newtons - pascals






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






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






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






45. 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


46. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






47. When the fluid is in motion






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






49. What we are studying






50. Exhaust