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Mechanical Systems 3

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. What is the purpose of a third class lever?
Opposite.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance

2. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.

3. What is the first thing a gear can do?
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
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4

4. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Opposite.
Foot- pounds
Third class lever.

5. How is distance measured in work?
Same.
Feet.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.

6. How do you find the mechanical advantage?
The rope that passes through your hands is greater than the distance that the load is raised.
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.
The force used to overcome friction is greater than the force used to do useful work.
Same.

7. An egg beater has a mechanical advantage of what?
1
A modification of an inclined plane.
Less than 1.
Same.

8. What does a micrometer measure?
A few thousandths of an inch.
your arm.
Shafts lying at any given angle.
fulcrum- weight- effort

9. Fractional mechanical advantage
The rope that passes through your hands is greater than the distance that the load is raised.
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

10. 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
32/8 = 4
The change of the direction of the pull.
Length of ramp/length of height from floor to truck

11. The miter gear faces are beveled at what angle?
Foot- pounds
45
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

12. The bevel gear is used to connect what?
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. hat is a screw?
A modification of an inclined plane.
Shafts lying at any given angle.
45
Work=Force*Distance

14. Class two lever
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.
fulcrum- weight- effort

15. With a single fixed sheave what is the only mechanical advantage?
45
The change of the direction of the pull.
In Horsepower.
A modification of an inclined plane.

16. The worm gear is a combination of what?
Connects shafts having a 90 degree angle.
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.
A screw and a spur gear.
Wheel and axle.

17. What is another way to find the mechanical advantage of an inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

18. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
Simple machine

19. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
Positive mechanical advantage.
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

20. What is the mechanical advantage for a single fixed block?
To raise a house or other heavy machinery.
Shafts lying at any given angle.
1
2(pie)/pitch

21. What is the jack screw used for?
Third class lever.
2(pie)/pitch
To raise a house or other heavy machinery.
Less than 1.

22. What is the power formula?
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Power=Work/Time
Less than 1.

23. What are first and third class levers used for?
With oil - grease or soap.
To speed up the motion of resistence.
A screw and a spur gear.
To magnify the applied force.

24. What direction does the effort and resistance move in first class levers?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

25. A miter gear connects what?
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The rope that passes through your hands is greater than the distance that the load is raised.

26. Gears can do a job for you by changing what three things?
your arm.
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
Gravity - Magnetism - Friction - Recoil

27. How is force measured in work?
1
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Same.

28. How is work done?
1
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.

29. What is an example of a third class lever?
Length of ramp/length of height from floor to truck
your arm.
The change of the direction of the pull.
Direction - speed or size of the force applied.

30. What kind of mechanical advantage does the first and second class lever provide?
With oil - grease or soap.
In pounds.
Door knob.
Positive mechanical advantage.

31. What is the second thing a gear can do?
Work=Force*Distance
Direction - speed or size of the force applied.
In pounds.
Increase or decrease the the speed of the applied motion.

32. What is one type of second class lever?
Same.
Work=Force*Distance
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

33. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
To speed up the motion of resistence.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.

34. What is the work formula?
Work=Force*Distance
In Horsepower.
A few thousandths of an inch.
Less than 1.

35. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.

36. What direction does the effort and resistance move in the second class levers?
Length of ramp/length of height from floor to truck
Same.
32/8 = 4
Door knob.

37. What are the 4 forces?
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
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

38. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
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.

39. 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?
Two surfaces move against one another.
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.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

40. What kind of machine is the inclined plane?
To raise a house or other heavy machinery.
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
Simple machine
In Horsepower.

41. Work is measured in units also known as?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Foot- pounds
Opposite.
45

42. What is another example of a wheel and axle?
Opposite.
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.
Door knob.
Direction - speed or size of the force applied.

43. How do you measure power?
Same.
In Horsepower.
fulcrum- weight- effort
With oil - grease or soap.

44. What is the formula for the mechanical advantage of a screw?
45
32/8 = 4
Foot- pounds
2(pie)/pitch

45. Friction is involved when?
Two surfaces move against one another.
fulcrum- weight- effort
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.

46. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
Power=Work/Time

47. What type of lever provides a fractional mechanical advantage?
Simple machine
To raise a house or other heavy machinery.
Third class lever.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

48. What is the third thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Third class lever.
Magnify or reduce the force which you apply.
To speed up the motion of resistence.

49. Formula for fractional mechanical disadvantage.
In pounds.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

50. What direction does the effort and resistance move in third class levers.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1
Same.
A few thousandths of an inch.