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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. 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






2. Length x Width






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






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






5. Applied at an angle or parallel to a surface






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






7. (pi) x (radius)^2






8. 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






9. 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






10. 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






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. Air is compressed - work is done on the system






13. (Force)(Distance)/Seconds






14. Rotation may occur






15. What we are studying






16. 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






17. When the moving fluid is a gas






18. When the fluid is in motion






19. Piston travels up and both plugs are closed






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






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






22. 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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23. Compression-Tension-Shear






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






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






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






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






28. Force x Distance






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






30. Ignition - power stroke






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






32. Combustion ignited by spark plug and materials are compressed






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






34. Dimensions and units






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






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






37. 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






38. 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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39. 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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40. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






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






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






43. Psi - newtons - pascals






44. Combustion of fuel mixture ignited by spark plug






45. Force/Area






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






48. Air is drawn in






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






50. Intake of fuel and air mix