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 are first and third class levers used for?
In pounds.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.

2. How is work done?
Can change the direction of motion.
Door knob.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.

3. What direction does the effort and resistance move in first class levers?
Opposite.
To speed up the motion of resistence.
Third class lever.
Connects shafts having a 90 degree angle.

4. What is the first thing a gear can do?
In Horsepower.
Can change the direction of motion.
32/8 = 4
Wheel and axle.

5. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
45
2(pie)/pitch
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.

6. What is the work formula?
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
Work=Force*Distance
A few thousandths of an inch.

7. What are the 4 forces?
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
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.
Gravity - Magnetism - Friction - Recoil

8. What is the ratio of any gear train?
Foot- pounds
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.
Can change the direction of motion.

9. What is the jack screw used for?
To raise a house or other heavy machinery.
Foot- pounds
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

10. The bevel gear is used to connect what?
Door knob.
32/8 = 4
45
Shafts lying at any given angle.

11. What is the mechanical advantage of a single movable block?
Gravity - Magnetism - Friction - Recoil
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

12. What direction does the effort and resistance move in third class levers.
1
With oil - grease or soap.
Same.
fulcrum- weight- effort

13. What is an example of a third class lever?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
The change of the direction of the pull.

14. What is the power formula?
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
Can change the direction of motion.

15. The miter gear faces are beveled at what angle?
45
2(pie)/pitch
Equals the weight of the object being hoisted.
In pounds.

16. 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.
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.
Door knob.

17. Fractional mechanical advantage
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.

18. Work is measured in units also known as?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds
Simple machine

19. What does a micrometer measure?
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance

20. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
A screw and a spur gear.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

21. How can you decrease friction on flat surfaces?
45
A modification of an inclined plane.
Same.
With oil - grease or soap.

22. How can you figure out the mechanical advantage of most block and falls by glance?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.

23. What direction does the effort and resistance move in the second class levers?
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.
Same.

24. What is the theoretical mechanical advantage of any gear train?
Length of ramp/length of height from floor to truck
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.
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.

25. With a single fixed sheave what is the only mechanical advantage?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Same.

26. What is the second thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.

27. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Opposite.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

28. 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
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.
A screw and a spur gear.
Shafts lying at any given angle.

29. What kind of machine is the inclined plane?
Less than 1.
Power=Work/Time
Connects shafts having a 90 degree angle.
Simple machine

30. An egg beater has a mechanical advantage of what?
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
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
Less than 1.

31. Formula for fractional mechanical disadvantage.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. A miter gear connects what?
Same.
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.

33. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Equals the weight of the object being hoisted.
your arm.
32/8 = 4

34. What is the formula for the wheel and axle?
Positive mechanical advantage.
Connects shafts having a 90 degree 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
Increase or decrease the the speed of the applied motion.

35. What kind of mechanical advantage does the first and second class lever provide?
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.
In pounds.
Positive mechanical advantage.

36. Class two lever
Door knob.
A few thousandths of an inch.
fulcrum- weight- effort
To speed up the motion of resistence.

37. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
With oil - grease or soap.
45

38. What is one type of second class lever?
Foot- pounds
Wheel and axle.
Door knob.
A screw and a spur gear.

39. What is the lever formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
Magnify or reduce the force which you apply.

40. What type of lever provides a fractional mechanical advantage?
Increase or decrease the the speed of the applied motion.
Same.
The change of the direction of the pull.
Third class lever.

41. hat is a screw?
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time

42. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.

43. What is the mechanical advantage for a single fixed block?
fulcrum- weight- effort
1
Connects shafts having a 90 degree angle.
Less than 1.

44. The threads of a screw are cut so?
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.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

45. The worm gear is a combination of what?
Less than 1.
45
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.

46. How is force measured in work?
In pounds.
Opposite.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.

47. How do you measure power?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

48. What is another example of a wheel and axle?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
1
Door knob.

49. Friction is involved when?
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Two surfaces move against one another.

50. What is the purpose of a third class lever?
Count the number of parts of the rope going to and from the movable block.
In pounds.
Wheel and axle.
To speed up the motion of resistence.