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

2. The rate of motion that an object changes position

3. Act like levers

4. F x d

5. Distance between the fulcrum and the effort force

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

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

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

9. 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

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

11. Unit of measurement for pressure

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

13. Science of designing machines to suit people

14. 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)

15. 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.

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

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

18. A fixed point

19. Several simple machines all working together in a system

20. 1st class - 2nd class - 3rd class

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

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

23. Do the work easier

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

25. (driven gear) smaller gear

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

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

28. Hydraulic system in your body

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

30. Distance between the fulcrum and the load

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

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

33. Reason that machines are never 100% efficient

34. F/A

35. Force exerted on the lever to make it move

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

37. Bigger gear

38. Energy of motion

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

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

41. 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.

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

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

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

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

46. Work unit

47. Mass of the object lifted by the lever

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

49. Pneumatic system in your body

50. 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