Test your basic knowledge |

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. Class two lever
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Same.
When a resistance is overcome by a force acting through a measurable distance.

2. The miter gear faces are beveled at what angle?
A screw and a spur gear.
Positive mechanical advantage.
Equals the weight of the object being hoisted.
45

3. 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
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Third class lever.

4. What is the work formula?
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.
Work=Force*Distance

5. What type of lever provides a fractional mechanical advantage?
A modification of an inclined plane.
Third class lever.
2(pie)/pitch
Increase or decrease the the speed of the applied motion.

6. What is the formula for the wheel and axle?
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
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
Increase or decrease the the speed of the applied motion.

7. How is distance measured in work?
Feet.
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.
Can change the direction of motion.
In pounds.

8. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
A modification of an inclined plane.
With oil - grease or soap.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.

9. What is the formula for the mechanical advantage of a screw?
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.

10. What does a micrometer measure?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.

11. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

12. What are the 4 forces?
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.

13. What kind of mechanical advantage does the first and second class lever provide?
In Horsepower.
Less than 1.
Foot- pounds
Positive mechanical advantage.

14. What is an example of a third class lever?
Same.
your arm.
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.

15. What is the ratio of any gear train?
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

16. What direction does the effort and resistance move in third class levers.
2(pie)/pitch
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Same.

17. What kind of machine is the inclined plane?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Power=Work/Time
The change of the direction of the pull.

18. What is the power formula?
Power=Work/Time
In pounds.
The change of the direction of the pull.
Direction - speed or size of the force applied.

19. What is the first thing a gear can do?
Can change the direction of motion.
With oil - grease or soap.
Power=Work/Time
1

20. What is another way to find the mechanical advantage of an inclined plane?
32/8 = 4
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.

21. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Same.
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck

22. What direction does the effort and resistance move in first class levers?
Simple machine
Opposite.
Same.
With oil - grease or soap.

23. Friction is involved when?
Two surfaces move against one another.
45
Positive mechanical advantage.
Can change the direction of motion.

24. What is the mechanical advantage for a single fixed block?
1
Same.
Wheel and axle.
To speed up the motion of resistence.

25. How is work done?
Feet.
your arm.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

26. What is the jack screw used for?
Wheel and axle.
In pounds.
The change of the direction of the pull.
To raise a house or other heavy machinery.

27. hat is a screw?
Can change the direction of motion.
A modification of an inclined plane.
To magnify the applied force.
Third class lever.

28. How do you measure power?
In Horsepower.
Same.
Wheel and axle.
Connects shafts having a 90 degree angle.

29. What is the purpose of a third class lever?
To speed up the motion of resistence.
Magnify or reduce the force which you apply.
Shafts lying at any given angle.
Foot- pounds

30. What is one type of second class lever?
Wheel and axle.
In pounds.
Work=Force*Distance
Power=Work/Time

31. A miter gear connects what?
To magnify the applied force.
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
With oil - grease or soap.

32. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.

33. Fractional mechanical advantage
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

34. The bevel gear is used to connect what?
1
Door knob.
Positive mechanical advantage.
Shafts lying at any given angle.

35. The worm gear is a combination of what?
A screw and a spur gear.
Can change the direction of motion.
1
When a resistance is overcome by a force acting through a measurable distance.

36. What is the mechanical advantage of a single movable block?
Same.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.

37. 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.
Shafts lying at any given angle.
Same.
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. How is force measured in work?
In pounds.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.

39. Work is measured in units also known as?
Opposite.
Foot- pounds
Direction - speed or size of the force applied.
The change of the direction of the pull.

40. Formula for fractional mechanical disadvantage.
In Horsepower.
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

41. How do you find the mechanical advantage?
Third class lever.
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.
Equals the weight of the object being hoisted.
2(pie)/pitch

42. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
2(pie)/pitch
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil

43. An egg beater has a mechanical advantage of what?
Same.
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

44. 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.
fulcrum- weight- effort
Opposite.
Equals the weight of the object being hoisted.

45. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.

46. What is another example of a wheel and axle?
45
Door knob.
Same.
Two surfaces move against one another.

47. 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.
Foot- pounds
Less than 1.
Direction - speed or size of the force applied.

48. What are first and third class levers used for?
Door knob.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.

49. What is the lever formula?
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.

50. The threads of a screw are cut so?
Equals the weight of the object being hoisted.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Opposite.