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Test your basic knowledge |

Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.

2. 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.
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable 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.

3. What direction does the effort and resistance move in third class levers.
Same.
Opposite.
45
The rope that passes through your hands is greater than the distance that the load is raised.

4. What is the ratio of any gear train?
2. Each half of the rope carries an equal amount of weight.
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.
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

5. The miter gear faces are beveled at what angle?
In pounds.
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
45

6. How is distance measured in work?
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
Feet.
Foot- pounds

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

8. 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.
Two surfaces move against one another.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.

9. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
32/8 = 4
A few thousandths of an inch.
Same.

10. How can you decrease friction on flat surfaces?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
With oil - grease or soap.

11. Class two lever
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.
Direction - speed or size of the force applied.
fulcrum- weight- effort

12. What is another example of a 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.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

13. What kind of mechanical advantage does the first and second class lever provide?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
A screw and a spur gear.
Positive mechanical advantage.

14. 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?
32/8 = 4
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Feet.

15. What is the mechanical advantage for a single fixed block?
Shafts lying at any given angle.
1
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil

16. What are first and third class levers used for?
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.

17. Friction is involved when?
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.
32/8 = 4

18. 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
Two surfaces move against one another.
Power=Work/Time
A screw and a spur gear.

19. What type of lever provides a fractional mechanical advantage?
Third class lever.
Positive mechanical advantage.
Wheel and axle.
A few thousandths of an inch.

20. What kind of machine is the inclined plane?
your arm.
Wheel and axle.
Same.
Simple machine

21. What does a micrometer measure?
Positive mechanical advantage.
Door knob.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

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

23. 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.
Direction - speed or size of the force applied.
Foot- pounds

24. hat is a screw?
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
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

25. The threads of a screw are cut so?
Same.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

26. Gears can do a job for you by changing what three things?
Equals the weight of the object being hoisted.
your arm.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

27. With a single fixed sheave what is the only mechanical advantage?
Third class lever.
In Horsepower.
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

28. What is the work formula?
The force used to overcome friction is greater than the force used to do useful work.
Door knob.
Third class lever.
Work=Force*Distance

29. What is the third thing a gear can do?
Third class lever.
Magnify or reduce the force which you apply.
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

30. What is the mechanical advantage of a single movable block?
1
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch

31. What is another way to find the mechanical advantage of an inclined plane?
Same.
Door knob.
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck

32. What is the first thing a gear can do?
To magnify the applied force.
Feet.
Can change the direction of motion.
The change of the direction of the pull.

33. How is force measured in work?
Power=Work/Time
In pounds.
A screw and a spur gear.
The change of the direction of the pull.

34. Fractional mechanical advantage
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

35. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil

36. How do you find the mechanical advantage?
Count the number of parts of the rope going to and from the movable 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.
Length of ramp/length of height from floor to truck
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

37. An egg beater has a mechanical advantage of what?
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

38. The worm gear is a combination of what?
A screw and a spur gear.
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.
With oil - grease or soap.
Less than 1.

39. Work is measured in units also known as?
Wheel and axle.
Foot- pounds
your arm.
Count the number of parts of the rope going to and from the movable block.

40. What is the formula for the mechanical advantage of a screw?
Can change the direction of motion.
To raise a house or other heavy machinery.
2(pie)/pitch
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.

41. Formula for fractional mechanical disadvantage.
1
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.
In pounds.

42. The bevel gear is used to connect what?
Shafts lying at any given angle.
Feet.
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.

43. What is one type of second class lever?
Less than 1.
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.

44. How do you measure power?
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.

45. What are the 4 forces?
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

46. What direction does the effort and resistance move in first class levers?
Positive mechanical advantage.
Direction - speed or size of the force applied.
2(pie)/pitch
Opposite.

47. A miter gear connects what?
fulcrum- weight- effort
The change of the direction of the pull.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.

48. What is an example of a third class lever?
your arm.
Foot- pounds
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

49. How is work done?
Two surfaces move against one another.
2(pie)/pitch
your arm.
When a resistance is overcome by a force acting through a measurable distance.

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