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






2. Ignition - power stroke






3. 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)






4. When the sum of all forces and the sum of all moments both equal forces - No movement






5. Dimensions and units






6. Describes how applied forces bring a body into motion






7. Exhaust






8. 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






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






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






11. The branch of science and engineering involving measurement






12. Combustion of fuel mixture ignited by spark plug






13. Applied at an angle or parallel to a surface






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

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15. When the fluid is in motion






16. (Force)(Distance)/Seconds






17. Length x Width






18. 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






19. When the moving fluid is a gas






20. When fluid is at rest






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






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






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






24. 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






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






26. What we are studying






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






28. Compression of fuel mix






29. Compression-Tension-Shear






30. A combination of components






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






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






33. ...






34. One that pushes on an object






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






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






37. Exhaust of combustion products






38. What we are not studying






39. Intake of fuel and air mix






40. Combustion ignited by spark plug and materials are compressed






41. 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






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






44. Psi - newtons - pascals






45. Static - Dynamic






46. The magnitude of something in a particular direction






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






48. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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49. 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






50. 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