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 an example of a third class lever?
1
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
To raise a house or other heavy machinery.

2. Work is measured in units also known as?
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
Third class lever.

3. Friction is involved when?
Work=Force*Distance
Two surfaces move against one another.
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.

4. 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.
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
In pounds.

5. What is the purpose of a third class lever?
With oil - grease or soap.
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To speed up the motion of resistence.

6. hat is a screw?
Feet.
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.
A modification of an inclined plane.

7. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
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.
With oil - grease or soap.

8. Class two lever
Two surfaces move against one another.
Less than 1.
A screw and a spur gear.
fulcrum- weight- effort

9. An egg beater has a mechanical advantage of what?
Two surfaces move against one another.
2(pie)/pitch
Less than 1.
To raise a house or other heavy machinery.

10. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
2(pie)/pitch
To speed up the motion of resistence.
Magnify or reduce the force which you apply.

11. How is distance measured in work?
Connects shafts having a 90 degree angle.
Feet.
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.

12. What is the theoretical mechanical advantage of any gear train?
In Horsepower.
Shafts lying at any given angle.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. How do you measure power?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.
your arm.
In Horsepower.

14. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
When a resistance is overcome by a force acting through a measurable distance.
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

15. What is the power formula?
A modification of an inclined plane.
Door knob.
To raise a house or other heavy machinery.
Power=Work/Time

16. What is the first thing a gear can do?
Can change the direction of motion.
Opposite.
32/8 = 4
To magnify the applied force.

17. What is the mechanical advantage for a single fixed block?
1
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.

18. A miter gear connects what?
Third class lever.
Connects shafts having a 90 degree angle.
1
Shafts lying at any given angle.

19. What kind of machine is the inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Simple machine
1

20. The bevel gear is used to connect what?
Positive mechanical advantage.
Shafts lying at any given angle.
With oil - grease or soap.
Can change the direction of motion.

21. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
With oil - grease or soap.
Power=Work/Time
Two surfaces move against one another.

22. 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.
45
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.

23. What are the 4 forces?
Wheel and axle.
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil

24. What is the lever formula?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

25. What direction does the effort and resistance move in first class levers?
A screw and a spur gear.
Opposite.
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.

26. The threads of a screw are cut so?
To magnify the applied force.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

27. What is the formula for the wheel and axle?
Less than 1.
Same.
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
Can change the direction of motion.

28. What is the ratio of any gear train?
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.
The rope that passes through your hands is greater than the distance that the load is raised.
Simple machine

29. What does a micrometer measure?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
Work=Force*Distance

30. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
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.
45

31. Formula for fractional mechanical disadvantage.
Feet.
Two surfaces move against one another.
To raise a house or other heavy machinery.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. What is another way to find the mechanical advantage of an inclined plane?
1
Less than 1.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.

33. Fractional mechanical advantage
fulcrum- weight- effort
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Count the number of parts of the rope going to and from the movable block.

34. The miter gear faces are beveled at what angle?
45
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.
Gravity - Magnetism - Friction - Recoil

35. What is the jack screw used for?
To raise a house or other heavy machinery.
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.

36. What is another example of a wheel and axle?
Feet.
Door knob.
To raise a house or other heavy machinery.
Opposite.

37. What direction does the effort and resistance move in the second class levers?
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Connects shafts having a 90 degree angle.

38. What is one type of second class lever?
Work=Force*Distance
Wheel and axle.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.

39. What direction does the effort and resistance move in third class levers.
The rope that passes through your hands is greater than the distance that the load is raised.
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.
Two surfaces move against one another.
Same.

40. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
In Horsepower.

41. How can you decrease friction on flat surfaces?
Direction - speed or size of the force applied.
A screw and a spur gear.
With oil - grease or soap.
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.

42. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.

43. What type of lever provides a fractional mechanical advantage?
Third class lever.
To raise a house or other heavy machinery.
A screw and a spur gear.
A few thousandths of an inch.

44. What is the work formula?
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
Simple machine
Work=Force*Distance

45. What are first and third class levers used for?
In Horsepower.
1
Equals the weight of the object being hoisted.
To magnify the applied force.

46. 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?
Shafts lying at any given angle.
32/8 = 4
Third class lever.
Wheel and axle.

47. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

48. The worm gear is a combination of what?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
A screw and a spur gear.
Connects shafts having a 90 degree angle.

49. How is force measured in work?
Work=Force*Distance
Simple machine
In pounds.
Same.

50. What is the third thing a gear can do?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck