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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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 worm gear is a combination of what?
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 Horsepower.
Connects shafts having a 90 degree angle.
A screw and a spur gear.

2. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Opposite.
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

3. What direction does the effort and resistance move in first class levers?
Opposite.
32/8 = 4
With oil - grease or soap.
Same.

4. What is another example of a wheel and axle?
Opposite.
Door knob.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

5. What is the lever formula?
Two surfaces move against one another.
1
Increase or decrease the the speed of the applied motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

6. Fractional mechanical advantage
Power=Work/Time
With oil - grease or soap.
Mechanical disadvantage. Use more force than the force of the load you lift.
Count the number of parts of the rope going to and from the movable block.

7. How do you find the mechanical advantage?
The change of the direction of the pull.
Positive mechanical advantage.
Simple machine
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.

8. What is the jack screw used for?
Foot- pounds
To raise a house or other heavy machinery.
A modification of an inclined plane.
32/8 = 4

9. With a single fixed sheave what is the only mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.
To speed up the motion of resistence.
The change of the direction of the pull.

10. What direction does the effort and resistance move in third class levers.
Magnify or reduce the force which you apply.
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.
To magnify the applied force.

11. What is the theoretical mechanical advantage of any gear train?
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

12. The miter gear faces are beveled at what angle?
Door knob.
To speed up the motion of resistence.
45
The rope that passes through your hands is greater than the distance that the load is raised.

13. What is the second thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
your arm.
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.

14. Gears can do a job for you by changing what three things?
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
Direction - speed or size of the force applied.

15. The bevel gear is used to connect what?
2. Each half of the rope carries an equal amount of weight.
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.
With oil - grease or soap.

16. How can you figure out the mechanical advantage of most block and falls by glance?
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

17. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
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.

18. An egg beater has a mechanical advantage of what?
Equals the weight of the object being hoisted.
To magnify the applied force.
Can change the direction of motion.
Less than 1.

19. How do you measure power?
In Horsepower.
Foot- pounds
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.

20. What are first and third class levers used for?
Same.
A screw and a spur gear.
Same.
To magnify the applied force.

21. What is the ratio of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Magnify or reduce the force which you apply.

22. A miter gear connects what?
Foot- pounds
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.

23. What type of lever provides a fractional mechanical advantage?
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
Third class lever.

24. What kind of machine is the inclined plane?
Simple machine
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

25. What is the first thing a gear can do?
Can change the direction of motion.
45
Gravity - Magnetism - Friction - Recoil
Same.

26. What is the work formula?
A modification of an inclined plane.
Work=Force*Distance
Direction - speed or size of the force applied.
Opposite.

27. What does a micrometer measure?
32/8 = 4
A few thousandths of an inch.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.

28. The threads of a screw are cut so?
To raise a house or other heavy machinery.
Same.
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.

29. 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
fulcrum- weight- effort
Less than 1.
1

30. What is the mechanical advantage for a single fixed block?
Foot- pounds
1
With oil - grease or soap.
Third class lever.

31. What is the purpose of a third class lever?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Less than 1.
To speed up the motion of resistence.

32. What direction does the effort and resistance move in the second class levers?
Same.
Feet.
To magnify the applied force.
45

33. Friction is involved when?
Third class lever.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Two surfaces move against one another.

34. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Direction - speed or size of the force applied.
Foot- pounds
Increase or decrease the the speed of the applied motion.

35. hat is a screw?
A modification of an inclined plane.
Less than 1.
Feet.
Opposite.

36. What is an example of a third class lever?
your arm.
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
45
Count the number of parts of the rope going to and from the movable block.

37. What is one type of second class lever?
Increase or decrease the the speed of the applied motion.
Same.
Wheel and axle.
With oil - grease or soap.

38. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
Equals the weight of the object being hoisted.

39. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.

40. 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
Less than 1.
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
Power=Work/Time

41. 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
Simple machine
Length of ramp/length of height from floor to truck
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

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

43. Work is measured in units also known as?
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.
The change of the direction of the pull.
Foot- pounds

44. Formula for fractional mechanical disadvantage.
2(pie)/pitch
In Horsepower.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.

45. What is the power formula?
Shafts lying at any given angle.
Power=Work/Time
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

46. Class two lever
fulcrum- weight- effort
Door knob.
Third class lever.
32/8 = 4

47. What is the mechanical advantage of a single movable block?
In Horsepower.
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.
1

48. What is the third thing a gear can do?
your arm.
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.

49. How is work done?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.
Opposite.

50. How is distance measured in work?
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
Feet.
2. Each half of the rope carries an equal amount of weight.