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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 direction does the effort and resistance move in third class levers.
Same.
Two surfaces move against one another.
In Horsepower.
In pounds.

2. How is force measured in work?
In pounds.
A modification of an inclined plane.
Two surfaces move against one another.
your arm.

3. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil
your arm.
Work=Force*Distance

4. How do you find the mechanical advantage?
Work=Force*Distance
1
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.

5. Friction is involved when?
Direction - speed or size of the force applied.
Two surfaces move against one another.
2(pie)/pitch
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

6. What is the first 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.
Positive mechanical advantage.
Feet.
Can change the direction of motion.

7. What is one type of second class lever?
Wheel and axle.
fulcrum- weight- effort
Same.
The force used to overcome friction is greater than the force used to do useful work.

8. The worm gear is a combination of what?
Two surfaces move against one another.
In Horsepower.
Less than 1.
A screw and a spur gear.

9. The threads of a screw are cut so?
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
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 force used to overcome friction is greater than the force used to do useful work.

10. An egg beater has a mechanical advantage of what?
Third class lever.
32/8 = 4
A screw and a spur gear.
Less than 1.

11. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.

12. What is the formula for the wheel and axle?
Can change the direction of motion.
A modification of an inclined plane.
Two surfaces move against one another.
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

13. hat is a screw?
A modification of an inclined plane.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Simple machine

14. What is the theoretical mechanical advantage of any gear train?
To raise a house or other heavy machinery.
32/8 = 4
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

15. How can you decrease friction on flat surfaces?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
The change of the direction of the pull.
With oil - grease or soap.

16. What is the lever formula?
The force used to overcome friction is greater than the force used to do useful work.
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.
Count the number of parts of the rope going to and from the movable block.

17. What is an example of a third class lever?
Power=Work/Time
32/8 = 4
2(pie)/pitch
your arm.

18. What kind of machine is the inclined plane?
Third class lever.
With oil - grease or soap.
Simple machine
To magnify the applied force.

19. A miter gear connects what?
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.

20. The bevel gear is used to connect what?
To raise a house or other heavy machinery.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Shafts lying at any given angle.

21. What is the jack screw used for?
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
Feet.

22. What is another example of a wheel and axle?
Length of ramp/length of height from floor to truck
Door knob.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.

23. What direction does the effort and resistance move in first class levers?
Opposite.
Count the number of parts of the rope going to and from the movable block.
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

24. Fractional mechanical advantage
Work=Force*Distance
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Mechanical disadvantage. Use more force than the force of the load you lift.

25. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
32/8 = 4
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.

26. What is the mechanical advantage for a single fixed block?
Shafts lying at any given angle.
Positive mechanical advantage.
1
Count the number of parts of the rope going to and from the movable block.

27. What are the 4 forces?
Feet.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Opposite.

28. What is the formula for the mechanical advantage of a screw?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
2(pie)/pitch

29. What is the power formula?
2(pie)/pitch
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

30. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Feet.
Door knob.

31. What are first and third class levers used for?
To magnify the applied force.
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.
1
With oil - grease or soap.

32. What does a micrometer measure?
Positive mechanical advantage.
In Horsepower.
Feet.
A few thousandths of an inch.

33. The miter gear faces are beveled at what angle?
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
45
Positive mechanical advantage.

34. What is the third thing a gear can do?
Door knob.
Magnify or reduce the force which you apply.
To magnify the applied force.
Opposite.

35. How do you measure power?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
In Horsepower.
Door knob.

36. What is the purpose of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
A few thousandths of an inch.

37. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

38. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Door knob.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

39. What is the ratio of any gear train?
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. What is another way to find the mechanical advantage of an inclined plane?
Same.
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck
Less than 1.

41. What is the second thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Feet.
Increase or decrease the the speed of the applied motion.
your arm.

42. How can you figure out the mechanical advantage of most block and falls by glance?
2. Each half of the rope carries an equal amount of weight.
1
your arm.
Count the number of parts of the rope going to and from the movable block.

43. 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
Less than 1.
Simple machine
32/8 = 4

44. What is the work formula?
Feet.
Work=Force*Distance
Length of ramp/length of height from floor to truck
Positive mechanical advantage.

45. What type of lever provides a fractional mechanical advantage?
Simple machine
2(pie)/pitch
Foot- pounds
Third class lever.

46. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.

47. Gears can do a job for you by changing what three things?
To speed up the motion of resistence.
A modification of an inclined plane.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

48. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

49. Class two lever
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.
2(pie)/pitch

50. Work is measured in units also known as?
Opposite.
Foot- pounds
Equals the weight of the object being hoisted.
Increase or decrease the the speed of the applied motion.