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






2. One that pushes on an object






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






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






5. 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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6. (Force)(Distance)/Seconds






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






8. Often a free body has _______ acting on it






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






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






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






12. Weight/Time






13. 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






14. Work/force or vertical distance/sloping distance






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






16. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






17. What we are studying






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






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






20. 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






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






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. Psi - newtons - pascals






24. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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25. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






26. 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






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






28. Compression-Tension-Shear






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






30. Length / Time






31. Rotation will not occur - but translation might occur






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. Liquid or gas






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. Exhaust of combustion products






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






37. Can be applied at a time on an object






38. Mass x acceleration






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






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






41. Applied at an angle or parallel to a surface






42. 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






43. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






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






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






46. Force x Distance






47. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






48. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width






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






50. Exhaust






Can you answer 50 questions in 15 minutes?



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