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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. How is force measured in work?
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.
Can change the direction of motion.
In pounds.

2. What is the theoretical mechanical advantage of any gear train?
fulcrum- weight- effort
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.

3. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Work=Force*Distance
Equals the weight of the object being hoisted.
In pounds.
Less than 1.

4. What is the jack screw used for?
To raise a house or other heavy machinery.
Same.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.

5. Formula for fractional mechanical disadvantage.
1
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.
your arm.

6. What is one type of second class lever?
Wheel and axle.
your arm.
Opposite.
45

7. What is another example of a wheel and axle?
Same.
Length of ramp/length of height from floor to truck
your arm.
Door knob.

8. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
Same.
Can change the direction of motion.

9. 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.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
fulcrum- weight- effort

10. The bevel gear is used to connect what?
Less than 1.
32/8 = 4
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

11. What is the first thing a gear can do?
In Horsepower.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

12. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
A modification of an inclined plane.
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

13. What is the ratio of any gear train?
2. Each half of the rope carries an equal amount of weight.
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.

14. What is the formula for the wheel and axle?
A few thousandths of an inch.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
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

15. Fractional mechanical advantage
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Magnify or reduce the force which you apply.

16. What are the 4 forces?
With oil - grease or soap.
Length of ramp/length of height from floor to truck
In Horsepower.
Gravity - Magnetism - Friction - Recoil

17. What kind of mechanical advantage does the first and second class lever provide?
Same.
To magnify the applied force.
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.

18. How do you find the mechanical advantage?
Same.
Door knob.
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.

19. What is the power formula?
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
Foot- pounds
Positive mechanical advantage.

20. How is work done?
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.
Third class lever.

21. What does a micrometer measure?
A few thousandths of an inch.
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance

22. What direction does the effort and resistance move in the second class levers?
Same.
Can change the direction of motion.
Magnify or reduce the force which you apply.
Door knob.

23. What kind of machine is the inclined plane?
2(pie)/pitch
Can change the direction of motion.
To magnify the applied force.
Simple machine

24. What are first and third class levers used for?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
To speed up the motion of resistence.
To magnify the applied force.

25. How do you measure power?
With oil - grease or soap.
To magnify the applied force.
In Horsepower.
Connects shafts having a 90 degree angle.

26. Work is measured in units also known as?
Foot- pounds
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Opposite.

27. 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?
Magnify or reduce the force which you apply.
32/8 = 4
To magnify the applied force.
Positive mechanical advantage.

28. What type of lever provides a fractional mechanical advantage?
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
Third class lever.
Simple machine

29. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Equals the weight of the object being hoisted.
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
Direction - speed or size of the force applied.

30. What is the formula for the mechanical advantage of a screw?
Increase or decrease the the speed of the applied motion.
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.

31. What is the mechanical advantage for a single fixed block?
Less than 1.
1
In Horsepower.
To raise a house or other heavy machinery.

32. The worm gear is a combination of what?
your arm.
2. Each half of the rope carries an equal amount of weight.
Less than 1.
A screw and a spur gear.

33. What direction does the effort and resistance move in third class levers.
Two surfaces move against one another.
A screw and a spur gear.
Same.
When a resistance is overcome by a force acting through a measurable distance.

34. The threads of a screw are cut so?
Same.
Work=Force*Distance
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.

35. What direction does the effort and resistance move in first class levers?
Connects shafts having a 90 degree angle.
Opposite.
your arm.
Wheel and axle.

36. Class two lever
Same.
fulcrum- weight- effort
Wheel and axle.
Simple machine

37. What is the second thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.
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.

38. The miter gear faces are beveled at what angle?
45
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

39. What is the work formula?
The rope that passes through your hands is greater than the distance that the load is raised.
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance
The change of the direction of the pull.

40. hat is a screw?
Work=Force*Distance
Same.
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.

41. What is the purpose of a third class lever?
In Horsepower.
Feet.
To speed up the motion of resistence.
Foot- pounds

42. 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.
your arm.
To raise a house or other heavy machinery.
In pounds.

43. An egg beater has a mechanical advantage of what?
45
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
1

44. Gears can do a job for you by changing what three things?
The change of the direction of the pull.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.
Foot- pounds

45. A miter gear connects what?
Same.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

46. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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
Shafts lying at any given angle.

47. Friction is involved when?
A screw and a spur gear.
Two surfaces move against one another.
With oil - grease or soap.
Opposite.

48. How is distance measured in work?
A screw and a spur gear.
Equals the weight of the object being hoisted.
Feet.
The change of the direction of the pull.

49. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Third class lever.
To speed up the motion of resistence.
Feet.

50. What is an example of a third class lever?
your arm.
A modification of an inclined plane.
Same.
Opposite.