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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. A miter gear connects what?
45
The rope that passes through your hands is greater than the distance that the load is raised.
Connects shafts having a 90 degree angle.
Opposite.

2. What is another example of a wheel and axle?
To magnify the applied force.
Work=Force*Distance
Door knob.
The change of the direction of the pull.

3. An egg beater has a mechanical advantage of what?
Less than 1.
Two surfaces move against one another.
1
Magnify or reduce the force which you apply.

4. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.

5. hat is a screw?
A modification of an inclined plane.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
To raise a house or other heavy machinery.

6. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
A screw and a spur gear.
1
Gravity - Magnetism - Friction - Recoil

7. What is the mechanical advantage for a single fixed block?
Same.
With oil - grease or soap.
1
Less than 1.

8. What is the power formula?
Power=Work/Time
A modification of an inclined plane.
Same.
Magnify or reduce the force which you apply.

9. What is the purpose of a third class lever?
Less than 1.
Third class lever.
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.

10. Formula for fractional mechanical disadvantage.
Same.
Direction - speed or size of the force applied.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

11. How can you figure out the mechanical advantage of most block and falls by glance?
Work=Force*Distance
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

12. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.

13. 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?
32/8 = 4
fulcrum- weight- effort
Third class lever.
Wheel and axle.

14. The threads of a screw are cut so?
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
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
Feet.

15. How do you measure power?
Opposite.
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.

16. Work is measured in units also known as?
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
Shafts lying at any given angle.
Foot- pounds

17. What is the mechanical advantage of a single movable block?
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.
In Horsepower.
Positive mechanical advantage.

18. What does a micrometer measure?
32/8 = 4
A few thousandths of an inch.
In pounds.
To speed up the motion of resistence.

19. What kind of mechanical advantage does the first and second class lever provide?
Length of ramp/length of height from floor to truck
In pounds.
Positive mechanical advantage.
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.

20. What is one type of second class lever?
Wheel and axle.
A screw and a spur gear.
2(pie)/pitch
To speed up the motion of resistence.

21. What is the lever formula?
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

22. Class two lever
fulcrum- weight- effort
Wheel and axle.
Length of ramp/length of height from floor to truck
Same.

23. Gears can do a job for you by changing what three things?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Simple machine

24. What is another way to find the mechanical advantage of an inclined plane?
1
In Horsepower.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

25. What type of lever provides a fractional mechanical advantage?
Feet.
Magnify or reduce the force which you apply.
Third class lever.
A screw and a spur gear.

26. What are first and third class levers used for?
Shafts lying at any given angle.
2(pie)/pitch
To magnify the applied force.
With oil - grease or soap.

27. The worm gear is a combination of what?
Feet.
To raise a house or other heavy machinery.
A screw and a spur gear.
Magnify or reduce the force which you apply.

28. How is distance measured in work?
Equals the weight of the object being hoisted.
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A screw and a spur gear.

29. What is the formula for the wheel and axle?
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
Two surfaces move against one another.
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

30. What is the first thing a gear can do?
2(pie)/pitch
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45
Can change the direction of motion.

31. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Two surfaces move against one another.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
Positive mechanical advantage.

33. What is the third thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.
2(pie)/pitch
Magnify or reduce the force which you apply.

34. What is the second thing a gear can do?
In Horsepower.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

35. How do you find the mechanical advantage?
45
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.
To raise a house or other heavy machinery.
Work=Force*Distance

36. What is the work formula?
32/8 = 4
Work=Force*Distance
To raise a house or other heavy machinery.
Shafts lying at any given angle.

37. Fractional mechanical advantage
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
fulcrum- weight- effort

38. What is the theoretical mechanical advantage of any gear train?
Increase or decrease the the speed of the applied motion.
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.

39. The miter gear faces are beveled at what angle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45
To speed up the motion of resistence.
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.

40. How can you decrease friction on flat surfaces?
To speed up the motion of resistence.
With oil - grease or soap.
A few thousandths of an inch.
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

41. How is force measured in work?
To raise a house or other heavy machinery.
Feet.
1
In pounds.

42. 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
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2. Each half of the rope carries an equal amount of weight.

43. What is an example of a third class lever?
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.
Shafts lying at any given angle.
your arm.

44. The bevel gear is used to connect what?
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
Can change the direction of motion.

45. What are the 4 forces?
Third class lever.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
2(pie)/pitch

46. What direction does the effort and resistance move in first class levers?
2. Each half of the rope carries an equal amount of weight.
your arm.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.

47. What direction does the effort and resistance move in the second class levers?
Same.
Wheel and axle.
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.

48. Friction is involved when?
To speed up the motion of resistence.
Two surfaces move against one another.
Shafts lying at any given angle.
Same.

49. What is the jack screw used for?
Door knob.
1
To raise a house or other heavy machinery.
Feet.

50. What direction does the effort and resistance move in third class levers.
Can change the direction of motion.
Power=Work/Time
Direction - speed or size of the force applied.
Same.