# 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. Several simple machines all working together in a system

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

3. Force exerted on the lever to make it move

4. 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

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

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

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

9. Reason that machines are never 100% efficient

10. Do the work faster

11. 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.

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

13. F/A

14. Distance between the fulcrum and the load

15. Do the work easier

16. A fixed point

17. Work unit

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

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

20. Act like levers

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

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

23. Do not seal the gas (usually air)

24. (driven gear) smaller gear

25. 1st class - 2nd class - 3rd class

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

27. 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

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

29. 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)

30. Mass of the object lifted by the lever

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

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

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

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

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

36. Pneumatic system in your body

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

38. Is the work done by the machine

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

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

41. Hydraulic system in your body

42. 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.

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

44. Science of designing machines to suit people

45. 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

46. Distance between the fulcrum and the effort force

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

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

49. F x d

50. Bigger gear