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






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






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






4. What we are studying






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






6. Length x Width






7. 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






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






9. 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






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






11. (Force)(Distance)/Seconds






12. 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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13. Length / Time






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






15. When the moving fluid is a gas






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






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






18. When the fluid is in motion






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






20. Can be applied at a time on an object






21. A pull on an object






22. When fluid is at rest






23. The magnitude of something in a particular direction






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






25. Air is compressed - work is done on the system






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 mix






28. 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






29. 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






30. 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






31. Applied at an angle or parallel to a surface






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






33. 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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34. Force/Area






35. Static - Dynamic






36. Body in motion (car)






37. Rotation may occur






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






39. Psi - newtons - pascals






40. Air is drawn in






41. Rotation will not occur - but translation might occur






42. Weight/Time






43. What we are not studying






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






45. 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)






46. Exhaust






47. 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






48. (pi) x (radius)^2






49. 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






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