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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. The miter gear faces are beveled at what angle?
45
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.

2. What is the third thing a gear can do?
Equals the weight of the object being hoisted.
1
Magnify or reduce the force which you apply.
Same.

3. What direction does the effort and resistance move in third class levers.
Same.
45
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

4. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
When a resistance is overcome by a force acting through a measurable distance.
Same.
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

5. How can you decrease friction on flat surfaces?
In Horsepower.
With oil - grease or soap.
Feet.
Increase or decrease the the speed of the applied motion.

6. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
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 force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

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

8. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
The change of the direction of the pull.
In Horsepower.
Count the number of parts of the rope going to and from the movable block.

9. What direction does the effort and resistance move in the second class levers?
Same.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
your arm.

10. What is the work formula?
Power=Work/Time
Equals the weight of the object being hoisted.
Work=Force*Distance
Less than 1.

11. What direction does the effort and resistance move in first class levers?
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.

12. What are first and third class levers used for?
Less than 1.
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.

13. What is the mechanical advantage of a single movable block?
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
To speed up the motion of resistence.

14. An egg beater has a mechanical advantage of what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification 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
Less than 1.

15. Work is measured in units also known as?
Same.
Less than 1.
Foot- pounds
To speed up the motion of resistence.

16. 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
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.
1
Equals the weight of the object being hoisted.

17. How is work done?
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

18. What kind of mechanical advantage does the first and second class lever provide?
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Positive mechanical advantage.

19. What is the first thing a gear can do?
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.

20. Fractional mechanical advantage
fulcrum- weight- effort
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

21. How is distance measured in work?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.
Feet.
The rope that passes through your hands is greater than the distance that the load is raised.

22. What is one type of second class lever?
Wheel and axle.
Power=Work/Time
In pounds.
To magnify the applied force.

23. The bevel gear is used to connect what?
Count the number of parts of the rope going to and from the movable block.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.

24. A miter gear connects what?
Connects shafts having a 90 degree angle.
In Horsepower.
To magnify the applied force.
Can change the direction of motion.

25. What is the mechanical advantage for a single fixed block?
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Third class lever.
Same.

26. What is the formula for the 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
Same.
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.

27. What is the theoretical mechanical advantage of any gear train?
In pounds.
Simple machine
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

28. Class two lever
your arm.
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

29. What is the lever formula?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

30. What is the power formula?
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

31. hat is a screw?
fulcrum- weight- effort
your arm.
A modification of an inclined plane.
32/8 = 4

32. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Same.
your arm.

33. What is an example of a third class lever?
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
your arm.
In pounds.
Shafts lying at any given angle.

34. The worm gear is a combination of what?
Length of ramp/length of height from floor to truck
Same.
A screw and a spur gear.
In pounds.

35. Formula for fractional mechanical disadvantage.
Positive mechanical advantage.
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.

36. How do you find the mechanical advantage?
Feet.
The change of the direction of the pull.
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.

37. What is the formula for the mechanical advantage of a screw?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

38. What does a micrometer measure?
fulcrum- weight- effort
Same.
A few thousandths of an inch.
Foot- pounds

39. What type of lever provides a fractional mechanical advantage?
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
Third class lever.

40. With a single fixed sheave what is the only mechanical advantage?
Foot- pounds
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
The change of the direction of the pull.

41. What is the ratio of any gear train?
Shafts lying at any given 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.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time

42. What is another example of a wheel and axle?
Door knob.
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
Magnify or reduce the force which you apply.

43. How is force measured in work?
Feet.
In pounds.
your arm.
Positive mechanical advantage.

44. What are the 4 forces?
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil

45. What is the purpose of a third class lever?
Can change the direction of motion.
fulcrum- weight- effort
In Horsepower.
To speed up the motion of resistence.

46. The threads of a screw are cut so?
Same.
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

47. What is the jack screw used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
To raise a house or other heavy machinery.

48. How do you measure power?
Opposite.
Increase or decrease the the speed of the applied motion.
Magnify or reduce the force which you apply.
In Horsepower.

49. How can you figure out the mechanical advantage of most block and falls by glance?
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.

50. Friction is involved when?
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
Two surfaces move against one another.
Wheel and axle.