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. Body in motion (car)






2. Length x Width






3. 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






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






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






6. 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






7. What we are studying






8. Combustion of fuel mixture ignited by spark plug






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






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






11. Piston travels up and both plugs are closed






12. Can be applied at a time on an object






13. ...






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






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






16. Force/Area






17. Dimensions and units






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






19. The branch of science and engineering involving measurement






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






21. 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)






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






23. Rotation will not occur - but translation might occur






24. 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






25. When fluid is at rest






26. Compression of fuel mix






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






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






30. 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.






31. Force x Distance






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






33. (Force)(Distance)/Seconds






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






35. Combustion ignited by spark plug and materials are compressed






36. 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






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






38. When the moving fluid is a gas






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






40. Force without machine/Force with machine






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






42. 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






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

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44. A pull on an object






45. 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






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






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






48. Weight/Time






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






50. 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