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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 first thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds

2. hat is a screw?
Door knob.
A modification of an inclined plane.
In Horsepower.
A screw and a spur gear.

3. A miter gear connects what?
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
Feet.
Power=Work/Time

4. How do you measure power?
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
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In Horsepower.

5. What direction does the effort and resistance move in the second class levers?
The change of the direction of the pull.
Power=Work/Time
Feet.
Same.

6. What is the third thing a gear can do?
A screw and a spur gear.
Magnify or reduce the force which you apply.
Feet.
Opposite.

7. How is distance measured in work?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.

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
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.
The change of the direction of the pull.

9. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
fulcrum- weight- effort
Opposite.
Increase or decrease the the speed of the applied motion.

10. The bevel gear is used to connect what?
Work=Force*Distance
fulcrum- weight- effort
Shafts lying at any given angle.
Direction - speed or size of the force applied.

11. How can you decrease friction on flat surfaces?
Door knob.
With oil - grease or soap.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

12. What is the lever formula?
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. What is the ratio of any gear train?
Wheel and axle.
A few thousandths of an inch.
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.

14. The worm gear is a combination of what?
Foot- pounds
Same.
Positive mechanical advantage.
A screw and a spur gear.

15. What type of lever provides a fractional mechanical advantage?
32/8 = 4
In Horsepower.
Third class lever.
Less than 1.

16. 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.
To speed up the motion of resistence.
Feet.
Simple machine

17. What does a micrometer measure?
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.
Connects shafts having a 90 degree angle.
Door knob.

18. What direction does the effort and resistance move in first class levers?
Two surfaces move against one another.
Opposite.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.

19. An egg beater has a mechanical advantage of what?
Magnify or reduce the force which you apply.
Opposite.
Less than 1.
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.

20. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Door knob.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

21. How do you find the mechanical advantage?
Connects shafts having a 90 degree angle.
your arm.
Door knob.
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.

22. How can you figure out the mechanical advantage of most block and falls by glance?
Can change the direction of motion.
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
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

23. What is the work formula?
Work=Force*Distance
Can change the direction of motion.
1
2. Each half of the rope carries an equal amount of weight.

24. What kind of mechanical advantage does the first and second class lever provide?
Simple machine
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.
Positive mechanical advantage.

25. What are first and third class levers used for?
To magnify the applied force.
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Third class lever.
fulcrum- weight- effort

27. What is the theoretical mechanical advantage of any gear train?
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.

28. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Simple machine
Equals the weight of the object being hoisted.

29. Fractional mechanical advantage
Third class lever.
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

30. What is one type of second class lever?
45
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

31. What is the jack screw used for?
Opposite.
A screw and a spur gear.
Wheel and axle.
To raise a house or other heavy machinery.

32. What is the formula for the wheel and axle?
32/8 = 4
Gravity - Magnetism - Friction - Recoil
In pounds.
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

33. How is force measured in work?
To magnify the applied force.
Same.
Increase or decrease the the speed of the applied motion.
In pounds.

34. What is the purpose of a third class lever?
Work=Force*Distance
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Wheel and axle.

35. How is work done?
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
32/8 = 4

36. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
45
Connects shafts having a 90 degree angle.

37. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
Work=Force*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

38. 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.
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
Power=Work/Time

39. What direction does the effort and resistance move in third class levers.
Connects shafts having a 90 degree angle.
Opposite.
Same.
your arm.

40. What is the mechanical advantage for a single fixed block?
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
1

41. What is the power formula?
45
Door knob.
Power=Work/Time
Foot- pounds

42. What is the mechanical advantage of a single movable block?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
Wheel and axle.

43. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Door knob.
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

44. What is another way to find the mechanical advantage of an inclined plane?
With oil - grease or soap.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.

45. Class two lever
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
Work=Force*Distance
fulcrum- weight- effort
Shafts lying at any given angle.

46. What is the second thing a gear can do?
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.

47. Friction is involved when?
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.

48. What is an example of a third class lever?
Direction - speed or size of the force applied.
your arm.
Same.
Positive mechanical advantage.

49. The miter gear faces are beveled at what angle?
A modification of an inclined plane.
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
45

50. What are the 4 forces?
A few thousandths of an inch.
Power=Work/Time
Wheel and axle.
Gravity - Magnetism - Friction - Recoil