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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. How do you measure power?
A modification of an inclined plane.
The change of the direction of the pull.
To raise a house or other heavy machinery.
In Horsepower.

2. How can you decrease friction on flat surfaces?
The force used to overcome friction is greater than the force used to do useful work.
1
With oil - grease or soap.
Simple machine

3. What is the mechanical advantage for a single fixed block?
1
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

4. What is the theoretical mechanical advantage of any gear train?
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

5. How is force measured in work?
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.
A screw and a spur gear.

6. 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.
In Horsepower.
Increase or decrease the the speed of the applied motion.

7. What is the work formula?
Work=Force*Distance
To raise a house or other heavy machinery.
Foot- pounds
A few thousandths of an inch.

8. The worm gear is a combination of what?
The change of the direction of the pull.
A screw and a spur gear.
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. What are the 4 forces?
Direction - speed or size of the force applied.
Simple machine
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

10. Class two lever
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.

11. What kind of machine is the inclined plane?
Work=Force*Distance
fulcrum- weight- effort
Simple machine
Door knob.

12. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To raise a house or other heavy machinery.
To magnify the applied force.
your arm.

13. Formula for fractional mechanical disadvantage.
Less than 1.
In Horsepower.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.

14. Work is measured in units also known as?
Foot- pounds
A modification of an inclined plane.
Third class lever.
Work=Force*Distance

15. What is the mechanical advantage of a single movable block?
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Work=Force*Distance

16. What does a micrometer measure?
Connects shafts having a 90 degree angle.
Opposite.
A few thousandths of an inch.
In Horsepower.

17. Gears can do a job for you by changing what three things?
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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.

18. What is the jack screw used for?
Feet.
To raise a house or other heavy machinery.
With oil - grease or soap.
Same.

19. What is the second thing a gear can do?
Wheel and axle.
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.
Magnify or reduce the force which you apply.

20. An egg beater has a mechanical advantage of what?
Can change the direction of motion.
Foot- pounds
Wheel and axle.
Less than 1.

21. What is the formula for the mechanical advantage of a screw?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

22. What is the third thing a gear can do?
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.

23. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Same.
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort

24. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
your arm.
In pounds.
Same.

25. The bevel gear is used to connect what?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

26. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To magnify the applied force.
Magnify or reduce the force which you apply.
Can change the direction of motion.
Equals the weight of the object being hoisted.

27. What is the formula for the wheel and axle?
Mechanical disadvantage. Use more force than the force of the load you lift.
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
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.

28. What is the purpose of a third class lever?
To speed up the motion of resistence.
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.

29. How can you figure out the mechanical advantage of most block and falls by glance?
2(pie)/pitch
In pounds.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.

30. Fractional mechanical advantage
Positive mechanical advantage.
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.

31. What is one type of second class lever?
Power=Work/Time
Wheel and axle.
Direction - speed or size of the force applied.
To magnify the applied force.

32. 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.
In pounds.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

33. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.

34. What is an example of a third class lever?
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.
The change of the direction of the pull.
Door knob.
your arm.

35. What direction does the effort and resistance move in the second class levers?
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
In pounds.
Same.

36. What is the first thing a gear can do?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.

37. What are first and third class levers used for?
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.
Less than 1.

38. 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?
A modification of an inclined plane.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.

39. 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.
Wheel and axle.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

40. The miter gear faces are beveled at what angle?
Wheel and axle.
Same.
45
A modification of an inclined plane.

41. What kind of mechanical advantage does the first and second class lever provide?
Same.
32/8 = 4
Positive mechanical advantage.
To speed up the motion of resistence.

42. What is the power formula?
Count the number of parts of the rope going to and from the 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.
Positive mechanical advantage.
Power=Work/Time

43. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
Length of ramp/length of height from floor to truck
Feet.
When a resistance is overcome by a force acting through a measurable distance.

44. How is work done?
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.
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.

45. How is distance measured in work?
In Horsepower.
Feet.
45
Third class lever.

46. What type of lever provides a fractional mechanical advantage?
Third class lever.
Less than 1.
Simple machine
Power=Work/Time

47. 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.
32/8 = 4
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil

48. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
Opposite.
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

49. What is another example of a wheel and axle?
Third class lever.
Shafts lying at any given angle.
Door knob.
Connects shafts having a 90 degree angle.

50. What direction does the effort and resistance move in first class levers?
In Horsepower.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Opposite.