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Mechanical Systems

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Do the work easier

2. Mass of the object lifted by the lever

3. F/A

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

5. Unit of measurement for pressure

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

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

8. Bigger gear

9. A fixed point

10. (driven gear) smaller gear

11. A large gear driving a smaller gear decreases torque and increases speed in the driven gear

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

13. Do not seal the gas (usually air)

14. Distance between the fulcrum and the effort force

15. Load Force (FL)/Effort Force (FE)

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

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

18. Heated water to make steam and then used to move a piston. When the piston moved - it caused an attached rod (which was connected to a crankshaft) to move as well - making the engine work.

19. Stored energy

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

21. Work unit

22. Hydraulic system in your body

23. Required a large shift in population from rural areas to the cities.

24. 1st class - 2nd class - 3rd class

25. 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.

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

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

28. Act like levers

29. Do the work faster

30. Reason that machines are never 100% efficient

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

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

33. The production of large quantities of a standardized article (often using assembly line techniques)

34. Is the work done by the machine

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

36. Several simple machines all working together in a system

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

38. Pneumatic system in your body

39. Energy of motion

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

41. Consists of a small cylinder that has a crank or handle. The axle of the winch acts like the fulcrum - the handle is the effort arm

42. F x d

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

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

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

46. 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

47. Energy is transferred from one place to another - and no energy is changed or converted.

48. 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)

49. Consists of a wire - rope - or cable moving on a grooved wheel. One or more combinations of wheels and ropes can be fixed in place or moveable - help you lift larger loads.

50. Distance between the fulcrum and the load