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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.
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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 bevel gear is used to connect what?
1
Magnify or reduce the force which you apply.
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.

2. How can you decrease friction on flat surfaces?
Opposite.
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.

3. Class two lever
Feet.
Length of ramp/length of height from floor to truck
Opposite.
fulcrum- weight- effort

4. What are first and third class levers used for?
With oil - grease or soap.
To magnify the applied force.
1
Increase or decrease the the speed of the applied motion.

5. 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.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
Same.

6. What is another way to find the mechanical advantage of an inclined plane?
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

7. What direction does the effort and resistance move in third class levers.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
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
Shafts lying at any given angle.

8. 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.
Same.
Can change the direction of motion.
Length of ramp/length of height from floor to truck

9. What is the second thing a gear can do?
Door knob.
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.
Increase or decrease the the speed of the applied motion.

10. What is the power 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
A few thousandths of an inch.
Power=Work/Time
32/8 = 4

11. What is the lever formula?
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.
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
Shafts lying at any given angle.

12. What is the work formula?
Third class lever.
Work=Force*Distance
Same.
A screw and a spur gear.

13. With a single fixed sheave what is the only mechanical advantage?
A modification of an inclined plane.
The change of the direction of the pull.
Can change the direction of motion.
Positive mechanical advantage.

14. What is the ratio of any gear train?
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Positive mechanical advantage.

15. What direction does the effort and resistance move in the second class levers?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

16. What does a micrometer measure?
A few thousandths of an inch.
Same.
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.

17. What is an example of a third class lever?
45
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.
your arm.

18. Work is measured in units also known as?
fulcrum- weight- effort
Positive mechanical advantage.
Foot- pounds
To speed up the motion of resistence.

19. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
2(pie)/pitch
45

20. What direction does the effort and resistance move in first class levers?
Opposite.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

21. What is the third thing a gear can do?
Opposite.
Foot- pounds
Magnify or reduce the force which you apply.
Wheel and axle.

22. What is the mechanical advantage of a single movable block?
Length of ramp/length of height from floor to truck
In pounds.
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.

23. What is the theoretical mechanical advantage of any gear train?
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.

24. What is another example of a wheel and axle?
With oil - grease or soap.
Door knob.
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

25. What is the first thing a gear can do?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Can change the direction of motion.
Feet.
A screw and a spur gear.

26. Friction is involved when?
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
45

27. Fractional mechanical advantage
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.

28. How do you measure power?
In Horsepower.
Wheel and axle.
A screw and a spur gear.
Length of ramp/length of height from floor to truck

29. 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.
2. Each half of the rope carries an equal amount of weight.
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.

30. What kind of mechanical advantage does the first and second class lever provide?
A modification of an inclined plane.
Positive mechanical advantage.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.

31. Formula for fractional mechanical disadvantage.
fulcrum- weight- effort
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.

32. The worm gear is a combination of what?
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.
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.

33. How is force measured in work?
Direction - speed or size of the force applied.
To magnify the applied force.
In pounds.
Can change the direction of motion.

34. 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?
Direction - speed or size of the force applied.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
Door knob.

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

36. The threads of a screw are cut so?
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.
Feet.
your arm.
The force used to overcome friction is greater than the force used to do useful work.

37. What is the purpose of a third class lever?
To speed up the motion of resistence.
Same.
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.

38. hat is a screw?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

39. What is the formula for the mechanical advantage of a screw?
Can change the direction of motion.
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.

40. What type of lever provides a fractional mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.
Gravity - Magnetism - Friction - Recoil
Same.

41. What is one type of second class lever?
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
Feet.

42. An egg beater has a mechanical advantage of what?
Increase or decrease the the speed of the applied motion.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
A few thousandths of an inch.

43. A miter gear connects what?
Gravity - Magnetism - Friction - Recoil
Simple machine
Connects shafts having a 90 degree angle.
A few thousandths of an inch.

44. The miter gear faces are beveled at what angle?
A few thousandths of an inch.
Opposite.
Same.
45

45. What kind of machine is the inclined plane?
With oil - grease or soap.
Simple machine
In Horsepower.
fulcrum- weight- effort

46. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
your arm.
45
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.

47. How is distance measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
With oil - grease or soap.
Feet.

48. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
32/8 = 4
To speed up the motion of resistence.
With oil - grease or soap.

49. 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
A screw and a spur gear.
Work=Force*Distance
Third class lever.

50. What is the mechanical advantage for a single fixed block?
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.
1
The force used to overcome friction is greater than the force used to do useful work.