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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
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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. The miter gear faces are beveled at what angle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.

2. What is the first thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
Can change the direction of motion.
your arm.

3. Friction is involved when?
The change of the direction of the pull.
Two surfaces move against one another.
Third class lever.
Magnify or reduce the force which you apply.

4. What is the power formula?
Same.
Power=Work/Time
The change of the direction of the pull.
Third class lever.

5. How can you decrease friction on flat surfaces?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Magnify or reduce the force which you apply.
With oil - grease or soap.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.

6. What direction does the effort and resistance move in first class levers?
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
Opposite.
The change of the direction of the pull.

7. What is the ratio of any gear train?
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

8. What are first and third class levers used for?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
To magnify the applied force.
Shafts lying at any given angle.

9. What is the second thing a gear can do?
To magnify the applied force.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.

10. An egg beater has a mechanical advantage of what?
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance
With oil - grease or soap.

11. How is distance measured in work?
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Feet.
A few thousandths of an inch.

12. How do you measure power?
Increase or decrease the the speed of the applied motion.
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.

13. How do you find the mechanical advantage?
Door knob.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Power=Work/Time
Opposite.

14. What kind of mechanical advantage does the first and second class lever provide?
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
Door knob.
Positive mechanical advantage.

15. What is another example of a wheel and axle?
Door knob.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
Wheel and axle.

16. What is the lever formula?
Work=Force*Distance
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A few thousandths of an inch.

17. What direction does the effort and resistance move in the second class levers?
your arm.
Positive mechanical advantage.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

18. Formula for fractional mechanical disadvantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
fulcrum- weight- effort
Door knob.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

19. The bevel gear is used to connect what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
The change of the direction of the pull.

20. Work is measured in units also known as?
45
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

21. What is the formula for the wheel and axle?
In Horsepower.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Gravity - Magnetism - Friction - Recoil
In pounds.

22. What does a micrometer measure?
The change of the direction of the pull.
Power=Work/Time
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

23. How is work done?
Mechanical disadvantage. Use more force than the force of the load you lift.
45
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.

24. A miter gear connects what?
Connects shafts having a 90 degree angle.
32/8 = 4
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
When a resistance is overcome by a force acting through a measurable distance.

25. What is the work formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
Same.

26. How is force measured in work?
To speed up the motion of resistence.
Simple machine
In pounds.
Magnify or reduce the force which you apply.

27. What is one type of second class lever?
With oil - grease or soap.
Wheel and axle.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.

28. What is the purpose of a third class lever?
To magnify the applied force.
To speed up the motion of resistence.
Simple machine
Connects shafts having a 90 degree angle.

29. What is the theoretical mechanical advantage of any gear train?
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.

30. What direction does the effort and resistance move in third class levers.
Direction - speed or size of the force applied.
Same.
The change of the direction of the pull.
Positive mechanical advantage.

31. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance

32. What is the formula for the mechanical advantage of a screw?
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
45
2(pie)/pitch

33. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
The change of the direction of the pull.
Shafts lying at any given angle.
To raise a house or other heavy machinery.

34. Class two lever
32/8 = 4
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort
Work=Force*Distance

35. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
In Horsepower.
To raise a house or other heavy machinery.
Can change the direction of motion.

36. What type of lever provides a fractional mechanical advantage?
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
Third class lever.
fulcrum- weight- effort

37. What are the 4 forces?
Same.
Gravity - Magnetism - Friction - Recoil
Same.
fulcrum- weight- effort

38. How can you figure out the mechanical advantage of most block and falls by glance?
Power=Work/Time
Opposite.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.

39. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
fulcrum- weight- effort
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.

40. The worm gear is a combination of what?
To magnify the applied force.
Feet.
Connects shafts having a 90 degree angle.
A screw and a spur gear.

41. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Simple machine
32/8 = 4
your arm.

42. What is the mechanical advantage of a single movable block?
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.
32/8 = 4

43. What is an example of a third class lever?
To magnify the applied force.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
your arm.

44. What is the mechanical advantage for a single fixed block?
Connects shafts having a 90 degree angle.
Simple machine
1
Door knob.

45. The threads of a screw are cut so?
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.

46. Belt drive Gear 1 has 32 teeth and gear 2 and 3 have 8 teeth - for 1 revolution that gear 1 makes how many revolutions do gears 2 and 3 make?
Power=Work/Time
Third class lever.
32/8 = 4
Same.

47. With a single fixed sheave what is the only mechanical advantage?
Power=Work/Time
The change of the direction of the pull.
Third class lever.
Count the number of parts of the rope going to and from the movable block.

48. hat is a screw?
Wheel and axle.
A modification of an inclined plane.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.

49. What is the jack screw used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.
Third class lever.

50. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
your arm.