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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 worm gear is a combination of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

2. What type of lever provides a fractional mechanical advantage?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

3. Formula for fractional mechanical disadvantage.
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
In pounds.

4. What kind of mechanical advantage does the first and second class lever provide?
2. Each half of the rope carries an equal amount of weight.
Feet.
Connects shafts having a 90 degree angle.
Positive mechanical advantage.

5. What is an example of a third class lever?
your arm.
2(pie)/pitch
Work=Force*Distance
Feet.

6. What is the mechanical advantage for a single fixed block?
Third class lever.
Power=Work/Time
Length of ramp/length of height from floor to truck
1

7. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
Two surfaces move against one another.

8. How can you decrease friction on flat surfaces?
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.
Can change the direction of motion.
With oil - grease or soap.

9. How can you figure out the mechanical advantage of most block and falls by glance?
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.

10. What are first and third class levers used for?
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
Direction - speed or size of the force applied.
Power=Work/Time

11. How is distance measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
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.

12. What is the purpose of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Positive mechanical advantage.
To speed up the motion of resistence.

13. With a single fixed sheave what is the only mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
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.

14. What are the 4 forces?
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
Gravity - Magnetism - Friction - Recoil
Simple machine

15. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

16. An egg beater has a mechanical advantage of what?
In Horsepower.
Positive mechanical advantage.
Less than 1.
The change of the direction of the pull.

17. The bevel gear is used to connect what?
Work=Force*Distance
Door knob.
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.

18. How do you measure power?
Foot- pounds
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.

19. What direction does the effort and resistance move in the second class levers?
Same.
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil

20. What is the jack screw used for?
To raise a house or other heavy machinery.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds

21. What is the work formula?
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.
Work=Force*Distance
Power=Work/Time

22. What is another example of a wheel and axle?
Door knob.
Count the number of parts of the rope going to and from the movable block.
In pounds.
fulcrum- weight- effort

23. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Two surfaces move against one another.

24. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
Foot- pounds

25. What kind of machine is the inclined plane?
Simple machine
your arm.
Gravity - Magnetism - Friction - Recoil
32/8 = 4

26. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
A screw and a spur gear.
Length of ramp/length of height from floor to truck

27. How is force measured in work?
In pounds.
Connects shafts having a 90 degree angle.
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

28. How do you find the mechanical advantage?
Simple machine
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
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.

29. The miter gear faces are beveled at what angle?
45
Third class lever.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

30. What is the formula for the wheel and axle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.
Magnify or reduce the force which you apply.
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

31. Work is measured in units also known as?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. What does a micrometer measure?
A few thousandths of an inch.
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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

33. What direction does the effort and resistance move in third class levers.
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck
Same.
A modification of an inclined plane.

34. Friction is involved when?
Same.
your arm.
To magnify the applied force.
Two surfaces move against one another.

35. A miter gear connects what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Less than 1.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

36. 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?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Less than 1.
32/8 = 4
Work=Force*Distance

37. What direction does the effort and resistance move in first class levers?
Increase or decrease the the speed of the applied motion.
Magnify or reduce the force which you apply.
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

38. hat is a screw?
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
fulcrum- weight- effort
A screw and a spur gear.

39. What is one type of second class lever?
The change of the direction of the pull.
In Horsepower.
Equals the weight of the object being hoisted.
Wheel and axle.

40. The threads of a screw are cut so?
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
2(pie)/pitch

41. What is the lever formula?
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.
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.
2(pie)/pitch

42. How is work done?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.

43. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck
Less than 1.
Two surfaces move against one another.

44. What is the second thing a gear can do?
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
Door knob.

45. 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.
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.
Length of ramp/length of height from floor to truck

46. What is the power formula?
Power=Work/Time
Same.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.

47. 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
fulcrum- weight- effort
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.

48. 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.
Opposite.
To speed up the motion of resistence.
Feet.

49. What is the first thing a gear can do?
2(pie)/pitch
Same.
A modification of an inclined plane.
Can change the direction of motion.

50. Class two lever
fulcrum- weight- effort
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Opposite.