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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. 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)






2. Combustion ignited by spark plug and materials are compressed






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






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

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






6. 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






7. Rotation may occur






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






9. Can be applied at a time on an object






10. Force x Distance






11. Length x Width x Height






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






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






14. Weight/Time






15. A pull on an object






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






17. 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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18. Liquid or gas






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






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






21. Ignition - power stroke






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






23. Static - Dynamic






24. When fluid is at rest






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






26. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied






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






28. Psi - newtons - pascals






29. What we are studying






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






31. 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






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






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






34. The branch of science and engineering involving measurement






35. 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 (






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






37. 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.






38. Fuel is injected and combusts due to temperature of compressed air






39. Describes a physical property of anything - What we are measuring






40. Piston travels up and exhaust valve opens. Combustion by product exhaustion






41. (Force)(Distance)/Seconds






42. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






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






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






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






46. Intake of fuel and air mix






47. Combustion of fuel mixture ignited by spark plug






48. Force without machine/Force with machine






49. 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






50. 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







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