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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 magnitude of something in a particular direction






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






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






4. Rotation may occur






5. Body in motion (car)






6. Piston travels up and both plugs are closed






7. When fluid is at rest






8. 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






9. 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)






10. 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






11. Liquid or gas






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






13. Ignition - power stroke






14. (Force)(Distance)/Seconds






15. Compression of fuel mix






16. Exhaust






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






18. 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






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






20. A combination of components






21. 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






22. 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






23. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






24. A pull on an object






25. Exhaust of combustion products






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






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






28. Length x Width






29. Describes how applied forces bring a body into motion






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






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






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






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






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






35. Rotation will not occur - but translation might occur






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






37. Length / Time






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






39. Movement along a line (reciprocal or linear motion) -Units: feet and meters






40. (pi) x (radius)^2






41. Compression-Tension-Shear






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






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






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






45. The branch of science and engineering involving measurement






46. Often a free body has _______ acting on it






47. Dimensions and units






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






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