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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. Fractional mechanical advantage
Same.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

2. What is the first thing a gear can do?
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
Can change the direction of motion.

3. How is distance measured in work?
Positive mechanical advantage.
Feet.
With oil - grease or soap.
Same.

4. 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.
fulcrum- weight- effort
Same.
A modification of an inclined plane.

5. What is the formula for the wheel and axle?
Wheel and axle.
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
Feet.
Work=Force*Distance

6. What is an example of a third class lever?
A screw and a spur gear.
your arm.
Same.
Third class lever.

7. The worm gear is a combination of what?
Shafts lying at any given angle.
Foot- pounds
A screw and a spur gear.
1

8. How can you figure out the mechanical advantage of most block and falls by glance?
In Horsepower.
A screw and a spur gear.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.

9. How is force measured in work?
Third class lever.
fulcrum- weight- effort
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.

10. What is the jack screw used for?
In Horsepower.
Positive mechanical advantage.
Less than 1.
To raise a house or other heavy machinery.

11. What is the lever formula?
Work=Force*Distance
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

12. What type of lever provides a fractional mechanical advantage?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.
Third class lever.

13. Class two lever
Length of ramp/length of height from floor to truck
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.
With oil - grease or soap.
fulcrum- weight- effort

14. The miter gear faces are beveled at what angle?
Work=Force*Distance
Less than 1.
2. Each half of the rope carries an equal amount of weight.
45

15. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Feet.

16. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Work=Force*Distance
To raise a house or other heavy machinery.
Same.

17. How is work done?
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

18. What kind of machine is the inclined plane?
Simple machine
Shafts lying at any given angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4

19. The bevel gear is used to connect what?
With oil - grease or soap.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time
Shafts lying at any given angle.

20. What are the 4 forces?
Less than 1.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.

21. What is the mechanical advantage for a single fixed block?
fulcrum- weight- effort
1
2(pie)/pitch
Can change the direction of motion.

22. 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.
Length of ramp/length of height from floor to truck
In Horsepower.
Equals the weight of the object being hoisted.

23. A miter gear connects what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Feet.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

24. An egg beater has a mechanical advantage of what?
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
Less than 1.
To raise a house or other heavy machinery.

25. What is the purpose of a third class lever?
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.
Count the number of parts of the rope going to and from the movable block.
Third class lever.

26. Work is measured in units also known as?
Foot- pounds
A modification of an inclined plane.
Same.
Equals the weight of the object being hoisted.

27. What is the theoretical mechanical advantage of any gear train?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time

28. What is the power formula?
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Third class lever.
Shafts lying at any given angle.

29. What does a micrometer measure?
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
Less than 1.

30. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
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.

31. How do you measure power?
Can change the direction of motion.
In Horsepower.
To magnify the applied force.
Equals the weight of the object being hoisted.

32. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Positive mechanical advantage.
Magnify or reduce the force which you apply.

33. What kind of mechanical advantage does the first and second class lever provide?
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
Work=Force*Distance

34. The threads of a screw are cut so?
Length of ramp/length of height from floor to truck
Same.
The force used to overcome friction is greater than the force used to do useful work.
In pounds.

35. What is the work formula?
Connects shafts having a 90 degree angle.
In pounds.
A modification of an inclined plane.
Work=Force*Distance

36. How do you find the mechanical advantage?
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.
A screw and a spur gear.
Less than 1.

37. What are first and third class levers used for?
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.
To magnify the applied force.
45

38. What is one type of second class lever?
your arm.
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.
Wheel and axle.

39. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Connects shafts having a 90 degree angle.
Foot- pounds
A few thousandths of an inch.
Equals the weight of the object being hoisted.

40. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
In Horsepower.

41. Friction is involved when?
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.
Two surfaces move against one another.
With oil - grease or soap.

42. What direction does the effort and resistance move in the second class levers?
32/8 = 4
Feet.
2. Each half of the rope carries an equal amount of weight.
Same.

43. 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?
Connects shafts having a 90 degree angle.
In Horsepower.
32/8 = 4
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 the third thing a gear can do?
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
32/8 = 4
Feet.

45. With a single fixed sheave what is the only mechanical advantage?
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.
The change of the direction of the pull.
Direction - speed or size of the force applied.

46. What is another example of a wheel and axle?
The change of the direction of the pull.
A screw and a spur gear.
Door knob.
1

47. What is the ratio of any gear train?
Foot- pounds
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

48. Gears can do a job for you by changing what three things?
Can change the direction of motion.
A modification of an inclined plane.
Same.
Direction - speed or size of the force applied.

49. hat is a screw?
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.

50. What direction does the effort and resistance move in first class levers?
Opposite.
To magnify the applied force.
Two surfaces move against one another.
Third class lever.