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. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
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
In pounds.

2. Gears can do a job for you by changing what three things?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

3. The threads of a screw are cut so?
45
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.
Foot- pounds

4. What kind of machine is the inclined plane?
Simple machine
Connects shafts having a 90 degree angle.
1
Gravity - Magnetism - Friction - Recoil

5. What are the 4 forces?
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.

6. What is the mechanical advantage for a single fixed block?
Equals the weight of the object being hoisted.
1
your arm.
A modification of an inclined plane.

7. Work is measured in units also known as?
Can change the direction of motion.
Same.
Foot- pounds
Length of ramp/length of height from floor to truck

8. What is the third thing a gear can do?
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.
45

9. What is the second thing a gear can do?
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.
Increase or decrease the the speed of the applied motion.

10. What is one type of second class lever?
A modification of an inclined plane.
Third class lever.
To magnify the applied force.
Wheel and axle.

11. The miter gear faces are beveled at what angle?
Connects shafts having a 90 degree angle.
Door knob.
45
To speed up the motion of resistence.

12. What is an example of a third class lever?
your arm.
Simple machine
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.

13. An egg beater has a mechanical advantage of what?
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
Length of ramp/length of height from floor to truck
Feet.

14. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.

15. A miter gear connects what?
Connects shafts having a 90 degree angle.
Feet.
your arm.
To magnify the applied force.

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Connects shafts having a 90 degree angle.
In Horsepower.
2(pie)/pitch
Equals the weight of the object being hoisted.

17. What is the first thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
Can change the direction of motion.

18. What direction does the effort and resistance move in first class levers?
Opposite.
Can change the direction of motion.
In Horsepower.
Two surfaces move against one another.

19. What is the ratio of any gear train?
With oil - grease or soap.
Work=Force*Distance
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.

20. The worm gear is a combination of what?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
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 screw and a spur gear.

21. 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?
When a resistance is overcome by a force acting through a measurable distance.
Feet.
32/8 = 4
With oil - grease or soap.

22. What is the theoretical mechanical advantage of any gear train?
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.
Magnify or reduce the force which you apply.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

23. What is the mechanical advantage of a single movable block?
Power=Work/Time
Third class lever.
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.

24. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
In pounds.
Gravity - Magnetism - Friction - Recoil

25. Class two lever
Magnify or reduce the force which you apply.
Same.
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

26. What direction does the effort and resistance move in the second class levers?
Same.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.

27. hat is a screw?
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Same.
A modification of an inclined plane.

28. What is the lever formula?
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

29. Fractional mechanical advantage
Shafts lying at any given angle.
Same.
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.

30. How do you measure power?
To magnify the applied force.
In Horsepower.
Magnify or reduce the force which you apply.
fulcrum- weight- effort

31. How is force measured in work?
In pounds.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
Increase or decrease the the speed of the applied motion.

32. What direction does the effort and resistance move in third class levers.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.
32/8 = 4
Same.

33. How can you figure out the mechanical advantage of most block and falls by glance?
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.
Foot- pounds

34. What does a micrometer measure?
Can change the direction of motion.
In Horsepower.
A few thousandths of an inch.
With oil - grease or soap.

35. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Same.
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.

36. What is the formula for the wheel and axle?
Wheel and axle.
Positive mechanical advantage.
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
Gravity - Magnetism - Friction - Recoil

37. What is the work formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

38. Friction is involved when?
Opposite.
Two surfaces move against one another.
Same.
The force used to overcome friction is greater than the force used to do useful work.

39. What is the power formula?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time

40. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful 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.
32/8 = 4

41. What type of lever provides a fractional mechanical advantage?
Can change the direction of motion.
When a resistance is overcome by a force acting through a measurable distance.
Same.
Third class lever.

42. What is the purpose of a third class lever?
1
2(pie)/pitch
32/8 = 4
To speed up the motion of resistence.

43. 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.
Feet.
32/8 = 4
Increase or decrease the the speed of the applied motion.

44. What is the jack screw used for?
Door knob.
A screw and a spur gear.
45
To raise a house or other heavy machinery.

45. How is work done?
fulcrum- weight- effort
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.

46. What are first and third class levers used for?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.

47. 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.
Third class lever.
The change of the direction of the pull.
Door knob.

48. How can you decrease friction on flat surfaces?
The force used to overcome friction is greater than the force used to do useful work.
Same.
With oil - grease or soap.
Two surfaces move against one another.

49. The bevel gear is used to connect what?
your arm.
Work=Force*Distance
Shafts lying at any given angle.
32/8 = 4

50. Formula for fractional mechanical disadvantage.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
Connects shafts having a 90 degree angle.