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Mechanical Systems

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. Work done by machine / work done to make the machine operate x100






2. The relationship between the speed of rotations of a smaller gear and a larger gear - can be calculated by dividing the number of driver gear teeth by the number of follower gear teeth.






3. Do not seal the gas (usually air)






4. F/A






5. Unit of measurement for pressure






6. The comparison of the force produced by a machine to the force applied to the machine. (the size of the load vs the size of the force needed to move the load)






7. When the driving and the driven gears are the same size






8. Pneumatic system in your body






9. Mass of the object lifted by the lever






10. A rigid bar or plank that can rotate around a fixed point






11. A combination of two wheels of different diameters that turn together - a lever that rotates in a circle around a center point or fulcrum.






12. Stored energy






13. Pressure applied to an enclosed fluid is transmitted undiminished in all directions throughout the fluid and perpendicular to the walls of the container.

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14. Is the work done by the machine






15. Do the work easier






16. Are used to overcome the frictional force of the machine






17. Within a machine are groups of parts that perform specific functions - such as braking or steering






18. Force exerted on the lever to make it move






19. Force of the small piston/area of the small piston = Force of the large piston/Area of the large piston






20. Hydraulic system in your body






21. Used to control the flow of a fluid. It is a moveable part that controls the flow by opening or closing






22. The ratio of the output to the input of any system - a comparison of the useful work provided by a machine or a system with - the work supplied to the machine or system






23. The combustion occurs inside the engine. The pistons goes through 4 steps: Intake stroke (taking in the fuel) - compression stroke (compressing the fuel- air mixture) - power stroke (the fuel- air mixture is ignited) - exhaust stroke (waste products






24. Heated water to make steam and then used to move a piston in a circular motion






25. Transferred to kinetic energy in machines in a dam to generate electrical energy






26. Reason that machines are never 100% efficient






27. Or ramp - makes it easier to move a load higher than it is - but - it has to be moved over a much longer distance.






28. Distance between the fulcrum and the load






29. A very complex combination of pulleys - including fixed and movable is called






30. A pair of wheels that have teeth that interlink. When they rotate together - one gear wheel transfers turning motion and force to the other.






31. Is the work needed to use - or operate the machine






32. To increase the force on the output piston - the input piston must move through a greater distance






33. Distance between the fulcrum and the effort force






34. A group of parts that work together to perform a function






35. Do the work faster






36. Act like levers






37. Used to apply force to the fluid - which creates pressure in the fluid






38. The fluid transfers the pressure from the input piston to the ____________






39. Bigger gear






40. A fixed point






41. Use the force of a liquid in a confined space - apply two essential characteristic of fluids - their incompressibility and their ability to transmit pressure






42. Energy of motion






43. Is done when a force acts on an object to make that object move - a transfer of energy






44. A measure of the amount of force applied to a given area






45. The rate of motion that an object changes position






46. 1st class - 2nd class - 3rd class






47. Work unit






48. Several simple machines all working together in a system






49. F x d






50. A small gear driving a larger gear increases torque and reduces speed in the driven gear