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






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






3. 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






4. Compression-Tension-Shear






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






6. Weight/Time






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






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






9. The branch of science and engineering involving measurement






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






11. When fluid is at rest






12. Length x Width






13. Rotation may occur






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






15. Combustion ignited by spark plug and materials are compressed






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






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






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






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






21. Exhaust






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






23. Exhaust of combustion products






24. Piston travels up and both plugs are closed






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






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






27. Can be applied at a time on an object






28. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






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






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






31. 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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32. (Force)(Distance)/Seconds






33. Work/force or vertical distance/sloping distance






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






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






36. 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)






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






38. (pi) x (radius)^2






39. Combustion of fuel mixture ignited by spark plug






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






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






42. 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






43. ...






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






45. 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






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






47. 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






48. A pull on an object






49. 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.






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

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