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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?
32/8 = 4
Two surfaces move against one another.
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
A screw and a spur gear.

2. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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.
Positive mechanical advantage.
Simple machine

3. 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.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
Door knob.

4. How can you decrease friction on flat surfaces?
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.

5. What direction does the effort and resistance move in first class levers?
Foot- pounds
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
Direction - speed or size of the force applied.

6. What does a micrometer measure?
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
A few thousandths of an inch.

7. The bevel gear is used to connect what?
Shafts lying at any given angle.
A screw and a spur gear.
Work=Force*Distance
32/8 = 4

8. What is the purpose of a third class lever?
Door knob.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.

9. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.

10. A miter gear connects what?
A few thousandths of an inch.
In Horsepower.
Connects shafts having a 90 degree angle.
Opposite.

11. Class two lever
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

12. An egg beater has a mechanical advantage of what?
With oil - grease or soap.
Feet.
your arm.
Less than 1.

13. What is the power formula?
Feet.
Shafts lying at any given angle.
Power=Work/Time
1

14. What is the ratio of any gear train?
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

15. What type of lever provides a fractional mechanical advantage?
Two surfaces move against one another.
Wheel and axle.
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.

16. What is the first thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
Can change the direction of motion.
Feet.

17. Formula for fractional mechanical disadvantage.
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.
2(pie)/pitch
Can change the direction of motion.

18. What is another example of a wheel and axle?
Door knob.
Work=Force*Distance
To raise a house or other heavy machinery.
Third class lever.

19. What is another way to find the mechanical advantage of an inclined plane?
your arm.
In pounds.
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck

20. Gears can do a job for you by changing what three things?
Simple machine
Direction - speed or size of the force applied.
In pounds.
Foot- pounds

21. Friction is involved when?
Two surfaces move against one another.
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
Third class lever.

22. hat is a screw?
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
A modification of an inclined plane.

23. The miter gear faces are beveled at what angle?
45
To speed up the motion of resistence.
Opposite.
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.

24. What is the third thing a gear can do?
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.

25. What is the formula for the wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.
The change of the direction of the pull.
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

26. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

27. What kind of machine is the inclined plane?
Simple machine
1
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

28. How is force measured in work?
Two surfaces move against one another.
In Horsepower.
2(pie)/pitch
In pounds.

29. How do you measure power?
Feet.
The change of the direction of the pull.
In Horsepower.
Same.

30. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Can change the direction of motion.
Same.
2(pie)/pitch

31. How is work done?
45
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.

32. What direction does the effort and resistance move in the second class levers?
fulcrum- weight- effort
Same.
Can change the direction of motion.
Door knob.

33. 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.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.

34. Fractional mechanical advantage
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
your arm.

35. What is an example of a third class lever?
45
Can change the direction of motion.
your arm.
With oil - grease or soap.

36. What is one type of second class lever?
Length of ramp/length of height from floor to truck
Wheel and axle.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

37. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

38. What is the mechanical advantage for a single fixed block?
Simple machine
1
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

39. What are the 4 forces?
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
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil

40. What kind of mechanical advantage does the first and second class lever provide?
With oil - grease or soap.
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance

41. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
A modification of an inclined plane.

42. What is the jack screw used for?
Work=Force*Distance
To raise a house or other heavy machinery.
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.

43. What is the mechanical advantage of a single movable block?
Feet.
A few thousandths of an inch.
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.

44. 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.
Third class lever.
fulcrum- weight- effort
Foot- pounds

45. What is the second thing a gear can do?
A modification of an inclined plane.
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
Can change the direction of motion.

46. How is distance measured in work?
Feet.
Shafts lying at any given angle.
A screw and a spur gear.
Third class lever.

47. 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?
Increase or decrease the the speed of the applied motion.
Same.
32/8 = 4
With oil - grease or soap.

48. Work is measured in units also known as?
Foot- pounds
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.
Direction - speed or size of the force applied.

49. What direction does the effort and resistance move in third class levers.
Gravity - Magnetism - Friction - Recoil
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.

50. What are first and third class levers used for?
To magnify the applied force.
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
In pounds.