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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. With a single fixed sheave what is the only mechanical advantage?
Two surfaces move against one another.
Same.
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.

2. What is the purpose of a third class lever?
Foot- pounds
your arm.
Less than 1.
To speed up the motion of resistence.

3. An egg beater has a mechanical advantage of what?
Wheel and axle.
Opposite.
A screw and a spur gear.
Less than 1.

4. What does a micrometer measure?
Opposite.
Length of ramp/length of height from floor to truck
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.

5. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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
To magnify the applied force.
Equals the weight of the object being hoisted.

6. What is one type of second class lever?
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.

7. The bevel gear is used to connect what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.
Can change the direction of motion.
Work=Force*Distance

8. How do you measure power?
The change of the direction of the pull.
Two surfaces move against one another.
In Horsepower.
Positive mechanical advantage.

9. The threads of a screw are cut so?
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.
In pounds.

10. What is another example of a wheel and axle?
Door knob.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4

11. What direction does the effort and resistance move in first class levers?
Opposite.
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.

12. What is the work formula?
Positive mechanical advantage.
Shafts lying at any given angle.
Work=Force*Distance
Less than 1.

13. How is force measured in work?
In pounds.
To magnify the applied force.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

14. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
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.
Simple machine

15. What are the 4 forces?
To speed up the motion of resistence.
Same.
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.

16. 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.
In Horsepower.
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.

17. What is the jack screw used for?
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

18. What is the formula for the wheel and axle?
Door knob.
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
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.

19. How is distance measured in 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
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
A screw and a spur gear.

20. A miter gear connects what?
Connects shafts having a 90 degree angle.
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.

21. The miter gear faces are beveled at what angle?
45
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.

22. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Feet.

23. What is the power formula?
32/8 = 4
your arm.
Power=Work/Time
In Horsepower.

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

25. hat is a screw?
Feet.
Positive mechanical advantage.
A modification of an inclined plane.
In Horsepower.

26. What is an example of a third class lever?
your arm.
A few thousandths of an inch.
A modification of an inclined plane.
Same.

27. 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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

28. 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.
In Horsepower.
Wheel and axle.
A few thousandths of an inch.

29. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Same.
Less than 1.
fulcrum- weight- effort

30. What is the theoretical mechanical advantage of any gear train?
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.
In Horsepower.
Can change the direction of motion.

31. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
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.
To magnify the applied force.

32. What kind of machine is the inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
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
Simple machine

33. The worm gear is a combination of what?
Door knob.
Same.
A screw and a spur gear.
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. How can you decrease friction on flat surfaces?
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
With oil - grease or soap.

35. What is the first thing a gear can do?
Can change the direction of motion.
2(pie)/pitch
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

36. 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
Magnify or reduce the force which you apply.
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

37. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
A few thousandths of an inch.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

38. What type of lever provides a fractional mechanical advantage?
Third class lever.
Same.
To magnify the applied force.
A modification of an inclined plane.

39. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
To speed up the motion of resistence.
Shafts lying at any given angle.
The change of the direction of the pull.

40. What is the formula for the mechanical advantage of a screw?
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
Same.
2(pie)/pitch

41. What direction does the effort and resistance move in third class levers.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

42. What is the lever formula?
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.
2(pie)/pitch
45

43. Work is measured in units also known as?
Foot- pounds
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

44. What direction does the effort and resistance move in the second class levers?
Same.
In pounds.
With oil - grease or soap.
Connects shafts having a 90 degree angle.

45. What are first and third class levers used for?
Length of ramp/length of height from floor to truck
To magnify the applied force.
your arm.
2. Each half of the rope carries an equal amount of weight.

46. Friction is involved when?
Two surfaces move against one another.
With oil - grease or soap.
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.

47. What is another way to find the mechanical advantage of an inclined plane?
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
With oil - grease or soap.

48. What is the ratio of any gear train?
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 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.
your arm.

49. Class two lever
Foot- pounds
fulcrum- weight- effort
Power=Work/Time
32/8 = 4

50. What is the mechanical advantage for a single fixed 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
A few thousandths of an inch.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.