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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 miter gear faces are beveled at what 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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
Direction - speed or size of the force applied.

2. What are first and third class levers used for?
Simple machine
Power=Work/Time
Connects shafts having a 90 degree angle.
To magnify the applied force.

3. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The force used to overcome friction is greater than the force used to do useful work.
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

4. Fractional mechanical advantage
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.

5. Formula for fractional mechanical disadvantage.
Foot- pounds
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.
The force used to overcome friction is greater than the force used to do useful work.

6. What type of lever provides a fractional mechanical advantage?
To magnify the applied force.
Two surfaces move against one another.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

7. 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?
1
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

8. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Two surfaces move against one another.
32/8 = 4
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.
Equals the weight of the object being hoisted.

9. How is distance measured in work?
Connects shafts having a 90 degree angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.
In Horsepower.

10. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Less than 1.

11. An egg beater has a mechanical advantage of what?
Less than 1.
Door knob.
In pounds.
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.

12. What direction does the effort and resistance move in the second class levers?
Same.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
Equals the weight of the object being hoisted.

13. What is an example of a third class lever?
45
A modification of an inclined plane.
your arm.
A few thousandths of an inch.

14. What kind of machine is the inclined plane?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Direction - speed or size of the force applied.
32/8 = 4

15. Friction is involved when?
The change of the direction of the pull.
Two surfaces move against one another.
Same.
In Horsepower.

16. What is another example of a wheel and axle?
Magnify or reduce the force which you apply.
1
A modification of an inclined plane.
Door knob.

17. How is force measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
To magnify the applied force.
In pounds.
Same.

18. Class two lever
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

19. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Less than 1.
With oil - grease or soap.
Power=Work/Time

20. What is the first thing a gear can do?
Same.
Can change the direction of motion.
To raise a house or other heavy machinery.
Simple machine

21. What is the mechanical advantage for a single fixed block?
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
Opposite.
1
Same.

22. What direction does the effort and resistance move in first class levers?
your arm.
Shafts lying at any given angle.
Third class lever.
Opposite.

23. hat is a screw?
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.
fulcrum- weight- effort
A modification of an inclined plane.

24. What is the formula for the mechanical advantage of a screw?
Simple machine
2(pie)/pitch
Foot- pounds
Positive mechanical advantage.

25. What is the lever formula?
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
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

26. What is the ratio of any gear train?
Same.
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.
Connects shafts having a 90 degree angle.

27. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
In pounds.
To magnify the applied force.

28. What is one type of second class lever?
Wheel and axle.
Magnify or reduce the force which you apply.
Power=Work/Time
Connects shafts having a 90 degree angle.

29. How is work done?
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Door knob.
Increase or decrease the the speed of the applied motion.

30. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
Feet.
45

31. How can you figure out the mechanical advantage of most block and falls by glance?
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Magnify or reduce the force which you apply.

32. 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.
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
Feet.

33. How do you measure power?
In Horsepower.
To speed up the motion of resistence.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

34. What is the jack screw used for?
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.

35. What is the mechanical advantage of a single movable block?
32/8 = 4
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.

36. 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.
Length of ramp/length of height from floor to truck
In pounds.
Simple machine

37. A miter gear connects what?
Same.
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
Connects shafts having a 90 degree angle.

38. 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
The rope that passes through your hands is greater than the distance that the load is raised.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

39. What does a micrometer measure?
1
Two surfaces move against one another.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

40. What kind of mechanical advantage does the first and second class lever provide?
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
Power=Work/Time

41. What is the power formula?
Power=Work/Time
Direction - speed or size of the force applied.
A screw and a spur gear.
To speed up the motion of resistence.

42. What is the formula for the wheel and axle?
Increase or decrease the the speed of the applied motion.
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
Equals the weight of the object being hoisted.
Power=Work/Time

43. 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.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Opposite.

44. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck
In Horsepower.
To magnify the applied force.

45. What is the theoretical mechanical advantage of any gear train?
Wheel and axle.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort

46. What direction does the effort and resistance move in third class levers.
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
The change of the direction of the pull.
Same.

47. The bevel gear is used to connect what?
Shafts lying at any given angle.
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
1

48. What is the purpose of a third class lever?
To speed up the motion of resistence.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

49. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.

50. What is the work formula?
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
fulcrum- weight- effort
Positive mechanical advantage.