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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. Ignition - power stroke






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






3. 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)






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






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






6. Length x Width






7. ...






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






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






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






11. Intake of fuel and air mix






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






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






14. (pi) x (radius)^2






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






16. Often a free body has _______ acting on it






17. Combustion of fuel mixture ignited by spark plug






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






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






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






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






23. What we are studying






24. Force/Area






25. Mass can neither by created nor destroyed - only transformed






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






27. Work/force or vertical distance/sloping distance






28. Force without machine/Force with machine






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






30. Piston travels up and exhaust valve opens. Combustion by product exhaustion






31. 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 (






32. 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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33. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






34. 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






35. 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






36. 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






37. A pull on an object






38. Varies by location (on earth) - distance (from earth) - and mass (of planet)






39. Rotation will not occur - but translation might occur






40. Air is drawn in






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






42. When fluid is at rest






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






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






45. When the moving fluid is a gas






46. A combination of components






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






48. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






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






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