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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 does a micrometer measure?
A few thousandths of an inch.
Same.
To raise a house or other heavy machinery.
Feet.

2. How do you find the mechanical advantage?
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.
Increase or decrease the the speed of the applied motion.

3. What is the ratio of any gear train?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.

4. What is the power formula?
The change of the direction of the pull.
Power=Work/Time
Increase or decrease the the speed of the applied motion.
Opposite.

5. What direction does the effort and resistance move in first class levers?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
Opposite.

6. An egg beater has a mechanical advantage of what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine
Less than 1.
Increase or decrease the the speed of the applied motion.

7. Fractional mechanical advantage
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
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.

8. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Direction - speed or size of the force applied.
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

9. What kind of mechanical advantage does the first and second class lever provide?
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
Door knob.
fulcrum- weight- effort

10. The bevel gear is used to connect what?
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
To speed up the motion of resistence.

11. What type of lever provides a fractional 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.
Third class lever.
Connects shafts having a 90 degree angle.
2(pie)/pitch

12. Gears can do a job for you by changing what three things?
Feet.
Two surfaces move against one another.
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. What is the work formula?
Gravity - Magnetism - Friction - Recoil
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
Count the number of parts of the rope going to and from the movable block.

14. How is force measured in work?
With oil - grease or soap.
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.

15. What is the formula for the mechanical advantage of a screw?
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
2(pie)/pitch
45
With oil - grease or soap.

16. What is the purpose of a third class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
To speed up the motion of resistence.
A modification of an inclined plane.

17. What is the lever formula?
Two surfaces move against one another.
Can change the direction of motion.
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

18. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch

19. How do you measure power?
Two surfaces move against one another.
In Horsepower.
Less than 1.
To raise a house or other heavy machinery.

20. What is the theoretical mechanical advantage of any gear train?
45
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

21. The worm gear is a combination of what?
Less than 1.
In pounds.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

22. What is an example of a third class lever?
2(pie)/pitch
fulcrum- weight- effort
Simple machine
your arm.

23. What is another example of a wheel and axle?
Opposite.
Door knob.
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
Less than 1.

24. What is the third thing a gear can do?
To speed up the motion of resistence.
Simple machine
A few thousandths of an inch.
Magnify or reduce the force which you apply.

25. What is the mechanical advantage of a single movable block?
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
Third class lever.

26. What is the first thing a gear can do?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. 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?
Less than 1.
Equals the weight of the object being hoisted.
32/8 = 4
Magnify or reduce the force which you apply.

28. How can you decrease friction on flat surfaces?
With oil - grease or soap.
your arm.
Feet.
Connects shafts having a 90 degree angle.

29. What kind of machine is the inclined plane?
Door knob.
Simple machine
Same.
Magnify or reduce the force which you apply.

30. What direction does the effort and resistance move in third class levers.
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
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

31. The threads of a screw are cut so?
Length of ramp/length of height from floor to truck
In Horsepower.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

32. What is the second thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.
Feet.
Simple machine

33. What is the mechanical advantage for a single fixed block?
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
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

34. With a single fixed sheave what is the only mechanical advantage?
2(pie)/pitch
fulcrum- weight- effort
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.

35. A miter gear connects what?
Connects shafts having a 90 degree 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.
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.

36. hat is a screw?
A modification of an inclined plane.
Door knob.
A screw and a spur gear.
Simple machine

37. What is the formula for the wheel and axle?
A screw and a spur gear.
Foot- pounds
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
To magnify the applied force.

38. Class two lever
Can change the direction of motion.
fulcrum- weight- effort
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.

39. How is distance measured in work?
Feet.
Magnify or reduce the force which you apply.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.

40. What are first and third class levers used for?
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

41. 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.
With oil - grease or soap.
45
Power=Work/Time

42. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.
45
Door knob.

43. How is work done?
Work=Force*Distance
Feet.
Can change the direction of motion.
When a resistance is overcome by a force acting through a measurable distance.

44. Work is measured in units also known as?
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.
Same.
Foot- pounds

45. What is one type of second class lever?
Door knob.
In Horsepower.
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
Wheel and axle.

46. The miter gear faces are beveled at what angle?
45
32/8 = 4
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.

47. Friction is involved when?
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
In pounds.
Two surfaces move against one another.
Power=Work/Time

48. What are the 4 forces?
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.
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch

49. What is the jack screw used for?
To raise a house or other heavy machinery.
A screw and a spur gear.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.

50. What direction does the effort and resistance move in the second class levers?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Gravity - Magnetism - Friction - Recoil
Same.
Direction - speed or size of the force applied.