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






2. 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






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






4. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






5. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






6. Compression-Tension-Shear






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






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






9. 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 (






10. Air is drawn in






11. Same pressure - work - volume - Different forces and distances






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






13. 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






14. Mechanics is an application of math that describes how forces affect a body






15. 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






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






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

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19. Piston travels up and both plugs are closed






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






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






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






23. Rotation will not occur - but translation might occur






24. 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






25. (Force)(Distance)/Seconds






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






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






28. Force x Distance






29. What we are studying






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






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






32. 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)






33. Length / Time






34. Describes how applied forces bring a body into motion






35. Often a free body has _______ acting on it






36. 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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37. Length x Width






38. Length x Width x Height






39. Ignition - power stroke






40. Liquid or gas






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






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






43. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






44. Weight/Time






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






46. The magnitude of something in a particular direction






47. A combination of components






48. Dimensions and units






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






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