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 first thing a gear can do?
Can change the direction of motion.
Equals the weight of the object being hoisted.
Wheel and axle.
Two surfaces move against one another.

2. What is the work formula?
A few thousandths of an inch.
Work=Force*Distance
1
In Horsepower.

3. The bevel gear is used to connect what?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
A modification of an inclined plane.

4. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

5. Class two lever
Magnify or reduce the force which you apply.
fulcrum- weight- effort
With oil - grease or soap.
To raise a house or other heavy machinery.

6. A miter gear connects what?
Power=Work/Time
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.

7. What are the 4 forces?
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

8. What is the jack screw used for?
With oil - grease or soap.
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 raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.

9. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
Wheel and axle.
With oil - grease or soap.

10. What is the ratio of any gear train?
45
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.
Can change the direction of motion.

11. What is another way to find the mechanical advantage of an inclined plane?
Power=Work/Time
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
The change of the direction of the pull.

12. How do you measure power?
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
Positive mechanical advantage.
In Horsepower.

13. How is distance measured in work?
Equals the weight of the object being hoisted.
Simple machine
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.

14. What kind of mechanical advantage does the first and second class lever provide?
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

15. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
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
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

16. What is one type of second class lever?
Wheel and axle.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
The change of the direction of the pull.

17. What is the formula for the wheel and axle?
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
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.

18. How do you find the mechanical advantage?
1
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

19. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.

20. An egg beater has a mechanical advantage of what?
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
1
Less than 1.

21. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
Direction - speed or size of the force applied.

22. Gears can do a job for you by changing what three things?
Can change the direction of motion.
Less than 1.
Direction - speed or size of the force applied.
Feet.

23. What direction does the effort and resistance move in third class levers.
Same.
In pounds.
32/8 = 4
To raise a house or other heavy machinery.

24. What is an example of a third class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.
Increase or decrease the the speed of the applied motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

25. What are first and third class levers used for?
1
The rope that passes through your hands is greater than the distance that the load is raised.
To magnify the applied force.
Can change the direction of motion.

26. The miter gear faces are beveled at what 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.
45
To magnify the applied force.
Magnify or reduce the force which you apply.

27. Friction is involved when?
Count the number of parts of the rope going to and from the movable block.
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
A few thousandths of an inch.

28. What is another example of a 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.
Door knob.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.

29. How can you decrease friction on flat surfaces?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.

30. Fractional mechanical advantage
To raise a house or other heavy machinery.
45
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.

31. What is the mechanical advantage for a single fixed block?
To speed up the motion of resistence.
1
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance

32. Work is measured in units also known as?
Foot- pounds
Work=Force*Distance
In pounds.
In Horsepower.

33. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Feet.
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.
Work=Force*Distance

34. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Positive mechanical advantage.

35. What does a micrometer measure?
fulcrum- weight- effort
To raise a house or other heavy machinery.
A few thousandths of an inch.
Can change the direction of motion.

36. What is the theoretical mechanical advantage of any gear train?
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.
Same.
To raise a house or other heavy machinery.

37. What direction does the effort and resistance move in the second class levers?
Opposite.
Power=Work/Time
Feet.
Same.

38. What type of lever provides a fractional mechanical advantage?
The change of the direction of the pull.
2(pie)/pitch
Third class lever.
In Horsepower.

39. What is the mechanical advantage of a single movable block?
Can change the direction of motion.
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.
Length of ramp/length of height from floor to truck

40. What is the purpose of a third class lever?
Wheel and axle.
Simple machine
To speed up the motion of resistence.
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

41. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
Positive mechanical advantage.
Opposite.

42. What is the formula for the mechanical advantage of a screw?
Same.
To magnify the applied force.
2(pie)/pitch
Work=Force*Distance

43. The threads of a screw are cut so?
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

44. How can you figure out the mechanical advantage of most block and falls by glance?
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Same.

45. What kind of machine is the inclined plane?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine

46. How is force measured in work?
Shafts lying at any given angle.
2(pie)/pitch
In pounds.
2. Each half of the rope carries an equal amount of weight.

47. What is the power formula?
A screw and a spur gear.
Positive mechanical advantage.
Same.
Power=Work/Time

48. The worm gear is a combination of what?
Work=Force*Distance
Positive mechanical advantage.
A screw and a spur gear.
Feet.

49. hat is a screw?
Length of ramp/length of height from floor to truck
A few thousandths of an inch.
45
A modification of an inclined plane.

50. What direction does the effort and resistance move in first class levers?
Wheel and axle.
Magnify or reduce the force which you apply.
Opposite.
2(pie)/pitch