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. 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.






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






3. Compression-Tension-Shear






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






5. Work/force or vertical distance/sloping distance






6. 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






7. The branch of science and engineering involving measurement






8. Body at rest or is in equilibrium (wall)






9. Rotation may occur






10. Mass x acceleration






11. 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






12. Combustion of fuel mixture ignited by spark plug






13. 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






14. Can be applied at a time on an object






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






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






18. Dimensions and units






19. (pi) x (radius)^2






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






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






22. One that pushes on an object






23. When the moving fluid is a gas






24. Length x Width






25. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






26. (Force)(Distance)/Seconds






27. 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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28. Piston travels up and both plugs are closed






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






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






32. 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






33. 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






34. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force






35. Air is drawn in






36. Ignition - power stroke






37. 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






38. 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






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






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






41. 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






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






43. Length x Width x Height






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






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






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






47. 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






48. 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






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






50. Often a free body has _______ acting on it