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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. Work/force or vertical distance/sloping distance






2. Air is drawn in






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






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






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






6. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






7. Force without machine/Force with machine






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






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






10. (Force)(Distance)/Seconds






11. Ignition - power stroke






12. Length x Width x Height






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






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






15. Length / Time






16. 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






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






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






19. 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






20. Rotation will not occur - but translation might occur






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






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






24. One that pushes on an object






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






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






27. Psi - newtons - pascals






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






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






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






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






32. 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






33. Body in motion (car)






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






35. 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)






36. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






37. 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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38. Combustion ignited by spark plug and materials are compressed






39. Translation (slide) -Rotate -Slide and Rotate Together






40. 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






41. ...






42. 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






43. Rotation may occur






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






45. 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






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






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






48. 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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49. Describes how applied forces bring a body into motion






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