Test your basic knowledge |

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. Exhaust of combustion products






2. What we are studying






3. 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






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






5. 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.






6. 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






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






8. (Force)(Distance)/Seconds






9. ...






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






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






12. Static - Dynamic






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






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






15. Rotation will not occur - but translation might occur






16. 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)






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






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






19. Length / Time






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






21. When the moving fluid is a gas






22. Three- dimensional property measured in units of length times length times length =length x width x height






23. Air is drawn in






24. Intake of fuel and air mix






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






26. Body in motion (car)






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

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29. 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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30. 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






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






32. Psi - newtons - pascals






33. Compression of fuel mix






34. Applied at an angle or parallel to a surface






35. When the fluid is in motion






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






37. Piston travels up and both plugs are closed






38. Rotation may occur






39. Dimensions and units






40. Often a free body has _______ acting on it






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






42. Can be applied at a time on an object






43. Weight/Time






44. 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






45. When fluid is at rest






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






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






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






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






50. 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