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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. What is the ratio of any gear train?
Feet.
To magnify the applied force.
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.

2. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
A screw and a spur gear.
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.

3. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Same.
To raise a house or other heavy machinery.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.

4. An egg beater has a mechanical advantage of what?
Length of ramp/length of height from floor to truck
A few thousandths of an inch.
Less than 1.
Simple machine

5. What is another example of a wheel and axle?
Two surfaces move against one another.
45
Door knob.
Less than 1.

6. How is force measured in work?
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
In pounds.

7. The bevel gear is used to connect what?
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2(pie)/pitch
Shafts lying at any given angle.

8. Gears can do a job for you by changing what three things?
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
45
A modification of an inclined plane.

9. What is the mechanical advantage of a single movable block?
To magnify the applied force.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort

10. What direction does the effort and resistance move in first class levers?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Opposite.
Foot- pounds

11. How can you decrease friction on flat surfaces?
Same.
To magnify the applied force.
With oil - grease or soap.
A screw and a spur gear.

12. 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.
Same.
Third class lever.
Direction - speed or size of the force applied.

13. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.

14. The miter gear faces are beveled at what angle?
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
45
Magnify or reduce the force which you apply.

15. Friction is involved when?
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Direction - speed or size of the force applied.

16. With a single fixed sheave what is the only mechanical advantage?
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.
With oil - grease or soap.

17. How do you find the 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.
To magnify the applied force.
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.

18. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Same.
Less than 1.

19. 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
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

20. 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?
To magnify the applied force.
Can change the direction of motion.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

21. What is the mechanical advantage for a single fixed block?
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
Connects shafts having a 90 degree angle.

22. What is the purpose of a third class lever?
A modification of an inclined plane.
45
Door knob.
To speed up the motion of resistence.

23. A miter gear connects what?
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
With oil - grease or soap.

24. What kind of machine is the inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
Simple machine
Positive mechanical advantage.

25. What are first and third class levers used for?
To magnify the applied force.
Opposite.
Can change the direction of motion.
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.

26. The worm gear is a combination of what?
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.

27. What is the theoretical mechanical advantage of any gear train?
The change of the direction of the pull.
Third class lever.
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.

28. How is distance measured in work?
Feet.
A modification of an inclined plane.
Opposite.
Power=Work/Time

29. What is the formula for the mechanical advantage of a screw?
32/8 = 4
2(pie)/pitch
With oil - grease or soap.
Shafts lying at any given angle.

30. hat is a screw?
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.
A modification of an inclined plane.
Positive mechanical advantage.

31. What is the jack screw used for?
fulcrum- weight- effort
In pounds.
Third class lever.
To raise a house or other heavy machinery.

32. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A few thousandths of an inch.
45

33. What is the power formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

34. Class two lever
With oil - grease or soap.
fulcrum- weight- effort
Third class lever.
Same.

35. How do you measure power?
In Horsepower.
With oil - grease or soap.
2(pie)/pitch
A few thousandths of an inch.

36. What does a micrometer measure?
Magnify or reduce the force which you apply.
In Horsepower.
32/8 = 4
A few thousandths of an inch.

37. What is the second thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
Foot- pounds

38. What type of lever provides a fractional mechanical advantage?
Third class lever.
Door knob.
To raise a house or other heavy machinery.
32/8 = 4

39. Work is measured in units also known as?
Shafts lying at any given angle.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
Simple machine

40. What are the 4 forces?
Wheel and axle.
Less than 1.
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.

41. What is the formula for the wheel and axle?
Can change the direction of motion.
2(pie)/pitch
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
Direction - speed or size of the force applied.

42. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.

43. What kind of mechanical advantage does the first and second class lever provide?
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.
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

44. What is the work formula?
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
fulcrum- weight- effort
Work=Force*Distance
Simple machine

45. What is one type of second class lever?
Magnify or reduce the force which you apply.
Foot- pounds
Wheel and axle.
In Horsepower.

46. What is the third thing a gear can do?
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Magnify or reduce the force which you apply.

47. 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.
In Horsepower.
Positive mechanical advantage.

48. What direction does the effort and resistance move in third class levers.
Wheel and axle.
Shafts lying at any given angle.
Same.
Count the number of parts of the rope going to and from the movable block.

49. What is the lever formula?
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.
Foot- pounds

50. How is work done?
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.