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






2. 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






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






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






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






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






7. 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






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






10. 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






11. When fluid is at rest






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






13. Air is drawn in






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

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15. 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






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






17. A combination of components






18. Dimensions and units






19. Force without machine/Force with machine






20. Ignition - power stroke






21. Often a free body has _______ acting on it






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






23. One that pushes on an object






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






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






26. Body in motion (car)






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






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






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






30. ...






31. Weight/Time






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






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






34. When the sum of all forces and the sum of all moments both equal forces - No movement






35. 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






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






37. Compression of fuel mix






38. 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 (






39. Rotation will not occur - but translation might occur






40. Liquid or gas






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






42. Length x Width x Height






43. Applied at an angle or parallel to a surface






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






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






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






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






48. When the fluid is in motion






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






50. What we are not studying