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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. 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
Feet.
Third class lever.
2. Each half of the rope carries an equal amount of weight.

2. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.

3. What type of lever provides a fractional mechanical advantage?
The change of the direction of the pull.
2(pie)/pitch
A few thousandths of an inch.
Third class lever.

4. What direction does the effort and resistance move in first class levers?
Opposite.
Door knob.
Same.
In pounds.

5. The bevel gear is used to connect what?
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil

6. The threads of a screw are cut so?
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.
The force used to overcome friction is greater than the force used to do useful work.
1

7. Friction is involved when?
To magnify the applied force.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.
In pounds.

8. 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
Power=Work/Time
In Horsepower.
Two surfaces move against one another.

9. How is distance measured in 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
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

10. What is the first thing a gear can do?
Can change the direction of motion.
Positive mechanical advantage.
A few thousandths of an inch.
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

11. A miter gear connects what?
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
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.
Feet.

12. What does a micrometer measure?
Increase or decrease the the speed of the applied motion.
In Horsepower.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Work=Force*Distance
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck

14. How can you decrease friction on flat surfaces?
Count the number of parts of the rope going to and from the movable block.
Less than 1.
With oil - grease or soap.
Foot- pounds

15. What is the mechanical advantage for a single fixed block?
The change of the direction of the pull.
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.

16. What is the power formula?
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
Power=Work/Time
fulcrum- weight- effort

17. The worm gear is a combination of what?
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.
Same.

18. What kind of machine is the inclined plane?
In pounds.
Less than 1.
Simple machine
In Horsepower.

19. What is the mechanical advantage of a single movable block?
Length of ramp/length of height from floor to truck
Work=Force*Distance
In Horsepower.
2. Each half of the rope carries an equal amount of weight.

20. What is another example of a wheel and axle?
32/8 = 4
In pounds.
Door knob.
2. Each half of the rope carries an equal amount of weight.

21. What is an example of a third class lever?
your arm.
2. Each half of the rope carries an equal amount of weight.
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.

22. What is the work formula?
A few thousandths of an inch.
Less than 1.
Work=Force*Distance
Feet.

23. How do you find the mechanical advantage?
Shafts lying at any given angle.
45
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.
your arm.

24. What direction does the effort and resistance move in third class levers.
Opposite.
Shafts lying at any given angle.
Same.
A few thousandths of an inch.

25. What is the ratio of any gear train?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
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.

26. What is the theoretical mechanical advantage of any gear train?
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

27. Class two lever
1
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.

28. What direction does the effort and resistance move in the second class levers?
Foot- pounds
With oil - grease or soap.
Same.
A screw and a spur gear.

29. What is the third thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Feet.

30. What is one type of second class lever?
Shafts lying at any given angle.
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.
Wheel and axle.

31. An egg beater has a mechanical advantage of what?
Same.
Less than 1.
32/8 = 4
The change of the direction of the pull.

32. What is the jack screw used for?
Work=Force*Distance
To raise a house or other heavy machinery.
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

33. What is the purpose of a third class lever?
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.
Shafts lying at any given angle.

34. Work is measured in units also known as?
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

35. What are first and third class levers used for?
Work=Force*Distance
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.
To magnify the applied force.

36. What are the 4 forces?
The change of the direction of the pull.
Simple machine
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil

37. What is another way to find the mechanical advantage of an inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
45
Length of ramp/length of height from floor to truck

38. Formula for fractional mechanical disadvantage.
32/8 = 4
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

39. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.

40. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Magnify or reduce the force which you apply.
Third class lever.
45

41. The miter gear faces are beveled at what angle?
Wheel and axle.
45
fulcrum- weight- effort
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

42. With a single fixed sheave what is the only mechanical advantage?
Count the number of parts of the rope going to and from the movable block.
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 change of the direction of the pull.
fulcrum- weight- effort

43. What is the second thing a gear can do?
Same.
Increase or decrease the the speed of the applied motion.
Can change the direction of motion.
A few thousandths of an inch.

44. How is force measured in work?
Less than 1.
Shafts lying at any given angle.
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. How do you measure power?
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Increase or decrease the the speed of the applied motion.

46. How can you figure out the mechanical advantage of most block and falls by glance?
To speed up the motion of resistence.
Third class lever.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.

47. What is the lever formula?
Wheel and axle.
In pounds.
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.

48. What kind of mechanical advantage does the first and second class lever provide?
Same.
your arm.
Positive mechanical advantage.
Foot- pounds

49. 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.
2(pie)/pitch
Same.
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.

50. hat is a screw?
Can change the direction of motion.
A modification of an inclined plane.
your arm.
Door knob.