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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 jack screw used for?
To raise a house or other heavy machinery.
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.

2. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
With oil - grease or soap.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

3. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.
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.

4. What is the power formula?
Can change the direction of motion.
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
Simple machine

5. What is the formula for the wheel and axle?
Opposite.
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.
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

6. The bevel gear is used to connect what?
Power=Work/Time
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

7. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
To speed up the motion of resistence.

8. The worm gear is a combination of what?
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
A screw and a spur gear.

9. How can you decrease friction on flat surfaces?
To magnify the applied force.
Third class lever.
With oil - grease or soap.
A screw and a spur gear.

10. What is another example of a wheel and axle?
Same.
Door knob.
Opposite.
Increase or decrease the the speed of the applied motion.

11. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
A screw and a spur gear.
45
The rope that passes through your hands is greater than the distance that the load is raised.

12. How is work done?
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.

13. 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.
Power=Work/Time
Length of ramp/length of height from floor to truck
your arm.

14. What is the mechanical advantage for a single fixed block?
1
To raise a house or other heavy machinery.
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.
Count the number of parts of the rope going to and from the movable block.

15. What is the purpose of a third class lever?
Can change the direction of motion.
To speed up the motion of resistence.
To raise a house or other heavy machinery.
With oil - grease or soap.

16. What is an example of a third class lever?
your arm.
To raise a house or other heavy machinery.
Wheel and axle.
fulcrum- weight- effort

17. hat is a screw?
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.
Same.
A modification of an inclined plane.

18. What are first and third class levers used for?
Door knob.
Simple machine
To magnify the applied force.
Same.

19. The miter gear faces are beveled at what angle?
Opposite.
Same.
45
The change of the direction of the pull.

20. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
Magnify or reduce the force which you apply.

21. 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.
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
Same.

22. What is the lever formula?
Shafts lying at any given angle.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Positive mechanical advantage.

23. What direction does the effort and resistance move in first class levers?
Same.
In Horsepower.
Less than 1.
Opposite.

24. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
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. How is force measured in work?
Direction - speed or size of the force applied.
A screw and a spur gear.
fulcrum- weight- effort
In pounds.

26. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
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.

27. What is the work formula?
32/8 = 4
Work=Force*Distance
Equals the weight of the object being hoisted.
2(pie)/pitch

28. What direction does the effort and resistance move in third class levers.
A modification of an inclined plane.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil

29. What is the first thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
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.
Wheel and axle.
Can change the direction of motion.

30. Work is measured in units also known as?
32/8 = 4
Foot- pounds
Connects shafts having a 90 degree angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

31. Fractional mechanical advantage
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

32. What does a micrometer measure?
Feet.
A few thousandths of an inch.
Opposite.
Shafts lying at any given angle.

33. How do you measure power?
In Horsepower.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.

34. What is the mechanical advantage of a single movable block?
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.
1
Direction - speed or size of the force applied.

35. What is the second thing a gear can do?
1
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
Simple machine

36. The threads of a screw are cut so?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

37. With a single fixed sheave what is the only mechanical advantage?
Shafts lying at any given angle.
The change of the direction of the pull.
Can change the direction of motion.
Magnify or reduce the force which you apply.

38. A miter gear connects what?
A modification of an inclined plane.
Simple machine
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.

39. What kind of machine is the inclined plane?
Power=Work/Time
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
Wheel and axle.

40. What type of lever provides a fractional mechanical advantage?
Third class lever.
45
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

41. What is the third thing a gear can do?
your arm.
Equals the weight of the object being hoisted.
To magnify the applied force.
Magnify or reduce the force which you apply.

42. What is another way to find the mechanical advantage of an inclined plane?
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
Wheel and axle.
1
Length of ramp/length of height from floor to truck

43. What direction does the effort and resistance move in the second class levers?
Same.
To raise a house or other heavy machinery.
Work=Force*Distance
Connects shafts having a 90 degree angle.

44. What kind of mechanical advantage does the first and second class lever provide?
Simple machine
Length of ramp/length of height from floor to truck
With oil - grease or soap.
Positive mechanical advantage.

45. What is one type of second class lever?
Wheel and axle.
1
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.

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?
32/8 = 4
To raise a house or other heavy machinery.
1
In Horsepower.

47. How is distance measured in work?
Door knob.
Work=Force*Distance
Opposite.
Feet.

48. Friction is involved when?
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.

49. An egg beater has a mechanical advantage of what?
Foot- pounds
Less than 1.
Magnify or reduce the force which you apply.
To magnify the applied force.

50. Class two lever
In pounds.
Foot- 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
fulcrum- weight- effort