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






2. When the fluid is in motion






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






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






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






6. Mass x acceleration






7. Force without machine/Force with machine






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






9. 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






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






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






12. 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

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13. Intake of fuel and air mix






14. What we are studying






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






16. Weight/Time






17. A combination of components






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






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






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






21. 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.






22. 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






23. 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






24. Exhaust of combustion products






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






26. Length x Width






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






28. The force simple machines use to do work on a single load or against a single force






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






30. When the moving fluid is a gas






31. Air is drawn in






32. Liquid or gas






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






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






36. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






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






38. 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






39. 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)






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

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41. Piston travels up and both plugs are closed






42. What we are not studying






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






44. Body in motion (car)






45. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






46. Rotation will not occur - but translation might occur






47. Ignition - power stroke






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






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






50. One that pushes on an object