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






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






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






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






5. 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






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






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






8. Exhaust






9. A pull on an object






10. 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






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






12. Mass x acceleration






13. 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






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






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






16. Applied at an angle or parallel to a surface






17. Length x Width






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






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






20. Force x Distance






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






22. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






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






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






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






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






27. 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






28. 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)






29. Work/force or vertical distance/sloping distance






30. Force/Area






31. Liquid or gas






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






33. Force without machine/Force with machine






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






35. Compression-Tension-Shear






36. Intake of fuel and air mixture - compression of mixture by piston






37. 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






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






39. Often a free body has _______ acting on it






40. What we are not studying






41. 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






42. When the fluid is in motion






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






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






46. (pi) x (radius)^2






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






48. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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49. One that pushes on an object






50. Length / Time







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Can you answer 50 questions in 15 minutes?


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