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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. 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.
Shafts lying at any given angle.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.

2. What is the formula for the mechanical advantage of a screw?
Door knob.
2(pie)/pitch
Wheel and axle.
32/8 = 4

3. What is the ratio of any gear train?
Simple machine
Wheel and axle.
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

4. What is the purpose of a third class lever?
To speed up the motion of resistence.
Wheel and axle.
Direction - speed or size of the force applied.
1

5. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Door knob.

6. What is another way to find the mechanical advantage of an inclined plane?
Opposite.
Length of ramp/length of height from floor to truck
Power=Work/Time
With oil - grease or soap.

7. What direction does the effort and resistance move in first class levers?
fulcrum- weight- effort
Opposite.
2(pie)/pitch
Two surfaces move against one another.

8. What is another example of a wheel and axle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A few thousandths of an inch.
Door knob.
In pounds.

9. How is force measured in work?
32/8 = 4
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.
In pounds.

10. Fractional mechanical advantage
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.
Wheel and axle.

11. Formula for fractional mechanical disadvantage.
Can change the direction of motion.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

12. 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
Foot- pounds
A screw and a spur gear.
Can change the direction of motion.

13. Class two lever
Connects shafts having a 90 degree angle.
fulcrum- weight- 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.
Same.

14. An egg beater has a mechanical advantage 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.
Magnify or reduce the force which you apply.
Less than 1.
Connects shafts having a 90 degree angle.

15. A miter gear connects what?
Less than 1.
A screw and a spur gear.
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.

16. What is the mechanical advantage of a single movable block?
Opposite.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.

17. Work is measured in units also known as?
In pounds.
In Horsepower.
A few thousandths of an inch.
Foot- pounds

18. The worm gear is a combination of what?
Opposite.
Feet.
A screw and a spur gear.
Power=Work/Time

19. What kind of machine is the inclined plane?
Wheel and axle.
your arm.
Gravity - Magnetism - Friction - Recoil
Simple machine

20. What is the power formula?
Power=Work/Time
Work=Force*Distance
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
Door knob.

21. What does a micrometer measure?
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck
Foot- pounds
A few thousandths of an inch.

22. Friction is involved when?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.

23. What direction does the effort and resistance move in third class levers.
With oil - grease or soap.
Length of ramp/length of height from floor to truck
Same.
In pounds.

24. What are the 4 forces?
Shafts lying at any given angle.
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
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

25. What is the lever formula?
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.
A modification of an inclined plane.
Less than 1.

26. 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.
A few thousandths of an inch.
Direction - speed or size of the force applied.
Positive mechanical advantage.

27. What is an example of a third class lever?
Two surfaces move against one another.
your arm.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

28. The bevel gear is used to connect what?
Shafts lying at any given angle.
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.
Wheel and axle.

29. hat is a screw?
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
A modification of an inclined plane.

30. The miter gear faces are beveled at what angle?
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.
45
Opposite.

31. How do you measure power?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Wheel and axle.
Power=Work/Time

32. What kind of mechanical advantage does the first and second class lever provide?
Simple machine
A few thousandths of an inch.
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

33. What is the formula for the wheel and axle?
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
Connects shafts having a 90 degree angle.
In Horsepower.

34. What are first and third class levers used for?
your arm.
To magnify the applied force.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

35. What type of lever provides a fractional mechanical advantage?
Opposite.
Third class lever.
1
2(pie)/pitch

36. What is one type of second class lever?
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
Door knob.
Wheel and axle.

37. What is the work formula?
Magnify or reduce the force which you apply.
Power=Work/Time
Work=Force*Distance
fulcrum- weight- effort

38. What is the first thing a gear can do?
Work=Force*Distance
Can change the direction of motion.
1
Increase or decrease the the speed of the applied motion.

39. 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.
The change of the direction of the pull.
With oil - grease or soap.
Wheel and axle.

40. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
1
Wheel and axle.
In pounds.

41. Gears can do a job for you by changing what three things?
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.
Direction - speed or size of the force applied.
To magnify the applied force.

42. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.
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

43. How is work done?
Less than 1.
Can change the direction of motion.
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.

44. What is the mechanical advantage for a single fixed block?
Magnify or reduce the force which you apply.
1
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

45. How can you figure out the mechanical advantage of most block and falls by glance?
Magnify or reduce the force which you apply.
Third class lever.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.

46. How is distance measured in work?
Same.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
Feet.

47. How can you decrease friction on flat surfaces?
your arm.
Door knob.
Same.
With oil - grease or soap.

48. What is the third thing a gear can do?
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
In pounds.
Magnify or reduce the force which you apply.

49. What direction does the effort and resistance move in the second class levers?
Count the number of parts of the rope going to and from the movable block.
your arm.
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

50. How do you find the mechanical advantage?
Third class lever.
Magnify or reduce the force which you apply.
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.
Positive mechanical advantage.