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. The worm gear is a combination of what?
45
fulcrum- weight- effort
A screw and a spur gear.
To speed up the motion of resistence.

2. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
A few thousandths of an inch.
Foot- pounds

3. What direction does the effort and resistance move in third class levers.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.
Same.
1

4. What is the third thing a gear can do?
Power=Work/Time
Wheel and axle.
A few thousandths of an inch.
Magnify or reduce the force which you apply.

5. How can you figure out the mechanical advantage of most block and falls by glance?
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.
Count the number of parts of the rope going to and from the movable block.
1

6. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
45
Power=Work/Time
Can change the direction of motion.

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
fulcrum- weight- effort
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
2(pie)/pitch

8. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Foot- pounds

9. What is one type of second class lever?
1
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

10. 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?
Same.
In Horsepower.
32/8 = 4
To speed up the motion of resistence.

11. 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.
your arm.
1
Positive mechanical advantage.

12. What direction does the effort and resistance move in first class levers?
fulcrum- weight- effort
Opposite.
Foot- pounds
Shafts lying at any given angle.

13. The miter gear faces are beveled at what angle?
To speed up the motion of resistence.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
45

14. What is the purpose of a third class lever?
To speed up the motion of resistence.
Less than 1.
Third class lever.
45

15. What are the 4 forces?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
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.

16. What kind of mechanical advantage does the first and second class lever provide?
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Work=Force*Distance
Positive mechanical advantage.

17. What is the ratio of any gear train?
A few thousandths of an inch.
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.
45

18. How is distance measured in work?
Wheel and axle.
Feet.
Direction - speed or size of the force applied.
A few thousandths of an inch.

19. What direction does the effort and resistance move in the second class levers?
Gravity - Magnetism - Friction - Recoil
Simple machine
Positive mechanical advantage.
Same.

20. What is the mechanical advantage for a single fixed block?
With oil - grease or soap.
Opposite.
1
Less than 1.

21. What is the mechanical advantage of a single movable block?
Can change the direction of motion.
Foot- pounds
Door knob.
2. Each half of the rope carries an equal amount of weight.

22. What type of lever provides a fractional mechanical advantage?
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
Third class lever.
Two surfaces move against one another.
45

23. What is the lever formula?
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
A few thousandths of an inch.

24. Gears can do a job for you by changing what three things?
A few thousandths of an inch.
Direction - speed or size of the force applied.
Can change the direction of 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

25. What is the power formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
your arm.
Power=Work/Time

26. Class two lever
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.
In Horsepower.
fulcrum- weight- effort

27. With a single fixed sheave what is the only mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
your arm.
45

28. What is the formula for the wheel and axle?
In pounds.
Direction - speed or size of the force applied.
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
Positive mechanical advantage.

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

30. How can you decrease friction on flat surfaces?
Door knob.
Power=Work/Time
Foot- pounds
With oil - grease or soap.

31. What is the formula for the mechanical advantage of a screw?
With oil - grease or soap.
Wheel and axle.
2(pie)/pitch
32/8 = 4

32. How is force measured in work?
To magnify the applied force.
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.
In pounds.

33. What is another example of a wheel and axle?
A modification of an inclined plane.
Door knob.
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.

34. How do you measure power?
A modification of an inclined plane.
Opposite.
In Horsepower.
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

35. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
In pounds.
To speed up the motion of resistence.

36. What is an example of a third class lever?
your arm.
32/8 = 4
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

37. Friction is involved when?
Feet.
Two surfaces move against one another.
1
fulcrum- weight- effort

38. An egg beater has a mechanical advantage of what?
The change of the direction of the pull.
Same.
Less than 1.
Foot- pounds

39. What is the work formula?
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.
To speed up the motion of resistence.
Work=Force*Distance

40. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

41. A miter gear connects what?
In Horsepower.
2(pie)/pitch
Can change the direction of motion.
Connects shafts having a 90 degree angle.

42. 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
In Horsepower.
To magnify the applied force.

43. What is the first thing a gear can do?
Can change the direction of 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
fulcrum- weight- effort
Shafts lying at any given angle.

44. The bevel gear is used to connect what?
Two surfaces move against one another.
To raise a house or other heavy machinery.
Positive mechanical advantage.
Shafts lying at any given angle.

45. What is the jack screw used for?
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck
In Horsepower.
Shafts lying at any given angle.

46. What is another way to find the mechanical advantage of an inclined plane?
your arm.
Power=Work/Time
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.

47. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.

48. Work is measured in units also known as?
To raise a house or other heavy machinery.
With oil - grease or soap.
32/8 = 4
Foot- pounds

49. What does a micrometer measure?
32/8 = 4
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
A few thousandths of an inch.

50. hat is a screw?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.