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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
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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 theoretical mechanical advantage of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

2. An egg beater has a mechanical advantage of what?
Same.
Less than 1.
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.

3. What is the mechanical advantage for a single fixed block?
1
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.

4. What are first and third class levers used for?
Direction - speed or size of the force applied.
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.

5. What is another example of a wheel and axle?
Door knob.
In Horsepower.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil

6. The threads of a screw are cut so?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.

7. The worm gear is a combination of what?
To speed up the motion of resistence.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
A screw and a spur gear.

8. Class two lever
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. How is distance measured in work?
Feet.
Foot- pounds
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.

10. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
your arm.
Door knob.
Positive mechanical advantage.

11. What is the power formula?
Power=Work/Time
45
Shafts lying at any given angle.
1

12. What direction does the effort and resistance move in the second class levers?
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
Same.
The change of the direction of the pull.

13. What kind of machine is the inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
Work=Force*Distance
fulcrum- weight- effort

14. What is the formula for the wheel and axle?
The force used to overcome friction is greater than the force used to do useful 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
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.

15. What is the third thing a gear can do?
fulcrum- weight- effort
Magnify or reduce the force which you apply.
The change of the direction of the pull.
A few thousandths of an inch.

16. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
A screw and a spur gear.
your arm.

17. What is the work formula?
Work=Force*Distance
Door knob.
Positive mechanical advantage.
Magnify or reduce the force which you apply.

18. The miter gear faces are beveled at what angle?
To magnify the applied force.
Feet.
45
A modification of an inclined plane.

19. What direction does the effort and resistance move in third class levers.
1
With oil - grease or soap.
your arm.
Same.

20. 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?
your arm.
Wheel and axle.
32/8 = 4
Increase or decrease the the speed of the applied motion.

21. What is the purpose of a third class lever?
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.
Same.
To speed up the motion of resistence.

22. How do you measure power?
In Horsepower.
45
Third class lever.
Less than 1.

23. What type of lever provides a fractional mechanical advantage?
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
Feet.
Third class lever.

24. What is the ratio of any gear train?
45
Same.
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.

25. What is the second thing a gear can do?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Third class lever.
Increase or decrease the the speed of the applied motion.

26. How can you decrease friction on flat surfaces?
Power=Work/Time
With oil - grease or soap.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

27. How is work done?
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

28. Friction is involved when?
Direction - speed or size of the force applied.
Two surfaces move against one another.
Door knob.
your arm.

29. What is one type of second class lever?
Less than 1.
Wheel and axle.
Equals the weight of the object being hoisted.
your arm.

30. hat is a screw?
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.
A screw and a spur gear.
A modification of an inclined plane.

31. What does a micrometer measure?
The change of the direction of the pull.
Wheel and axle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.

32. What is the mechanical advantage of a single movable block?
Same.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.

33. 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.
Opposite.
Feet.
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

34. 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.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

35. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Wheel and axle.
Can change the direction of motion.
To speed up the motion of resistence.

36. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
your arm.
45
When a resistance is overcome by a force acting through a measurable distance.

37. What direction does the effort and resistance move in first class levers?
Opposite.
Work=Force*Distance
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.

38. What is the first thing a gear can do?
Door knob.
2(pie)/pitch
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

39. Formula for fractional mechanical disadvantage.
Two surfaces move against one another.
A few thousandths of an inch.
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

40. With a single fixed sheave what is the only mechanical advantage?
Simple machine
Can change the direction of motion.
Foot- pounds
The change of the direction of the pull.

41. How is force measured in work?
Count the number of parts of the rope going to and from the movable block.
Same.
In pounds.
Third class lever.

42. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
your arm.
1

43. The bevel gear is used to connect what?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.

44. Work is measured in units also known as?
Foot- pounds
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.
Same.

45. How can you figure out the mechanical advantage of most block and falls by glance?
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.

46. Gears can do a job for you by changing what three things?
To magnify the applied force.
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Shafts lying at any given angle.

47. What kind of mechanical advantage does the first and second class lever provide?
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.

48. 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.
Third class lever.
In Horsepower.
To raise a house or other heavy machinery.

49. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
Increase or decrease the the speed of the applied motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

50. A miter gear connects what?
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
Connects shafts having a 90 degree angle.
The change of the direction of the pull.