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. Force x Distance






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






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






4. 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






5. Force/Area






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






7. What we are not studying






8. 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






9. Rotation may occur






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






11. 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






12. 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






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






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






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






16. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






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






18. A pull on an object






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






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






21. Combustion ignited by spark plug and materials are compressed






22. Exhaust






23. Intake of fuel and air mix






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






25. ...






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






27. 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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28. 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.






29. Force without machine/Force with machine






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






31. 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






32. 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






33. The branch of science and engineering involving measurement






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






36. 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






37. Length / Time






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






39. (Force)(Distance)/Seconds






40. Static - Dynamic






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






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






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






44. Compression-Tension-Shear






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






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






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. Rotation will not occur - but translation might occur






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






50. Fuel is injected and combusts due to temperature of compressed air