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

2. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.
Length of ramp/length of height from floor to truck

3. What direction does the effort and resistance move in the second class levers?
Same.
Can change the direction of motion.
Length of ramp/length of height from floor to truck
32/8 = 4

4. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
A screw and a spur gear.
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.

5. The miter gear faces are beveled at what angle?
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
45
fulcrum- weight- effort

6. What direction does the effort and resistance move in first class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Opposite.
2. Each half of the rope carries an equal amount of weight.
your arm.

7. 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.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.

8. What kind of mechanical advantage does the first and second class lever provide?
To magnify the applied force.
45
your arm.
Positive mechanical advantage.

9. What is the second thing a gear can do?
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.
Increase or decrease the the speed of the applied motion.
Feet.
2. Each half of the rope carries an equal amount of weight.

10. Formula for fractional mechanical disadvantage.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Same.

11. What is the mechanical advantage for a single fixed block?
Shafts lying at any given angle.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
1

12. What is the purpose of a third class lever?
To speed up the motion of resistence.
45
Opposite.
Two surfaces move against one another.

13. The worm gear is a combination of what?
Work=Force*Distance
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.

14. hat is a screw?
A modification of an inclined plane.
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.
1

15. How is distance measured in work?
Feet.
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.
Positive mechanical advantage.

16. How do you measure power?
Less than 1.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

17. What is one type of second class lever?
your arm.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.

18. 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
2(pie)/pitch
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

19. An egg beater has a mechanical advantage of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Feet.

20. Friction is involved when?
A few thousandths of an inch.
Third class lever.
A screw and a spur gear.
Two surfaces move against one another.

21. What is an example of a third class lever?
Can change the direction of motion.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
your arm.

22. What does a micrometer measure?
Gravity - Magnetism - Friction - Recoil
Same.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

23. What is the mechanical advantage of a single movable block?
Equals the weight of the object being hoisted.
45
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance

24. What is the ratio of any gear train?
Increase or decrease the the speed of the applied motion.
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.
The change of the direction of the pull.

25. Work is measured in units also known as?
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
In pounds.
Foot- pounds

26. A miter gear connects what?
45
Can change the direction of motion.
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

27. What is the work formula?
Work=Force*Distance
In Horsepower.
fulcrum- weight- effort
Simple machine

28. Class two lever
Work=Force*Distance
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.
Third class lever.

29. What is the jack screw used for?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.

30. How is force measured in work?
In pounds.
your arm.
1
Mechanical disadvantage. Use more force than the force of the load you lift.

31. What is the theoretical mechanical advantage of any gear train?
Third class lever.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.
Door knob.

32. What is the formula for the mechanical advantage of a screw?
Count the number of parts of the rope going to and from the movable block.
Opposite.
2(pie)/pitch
To speed up the motion of resistence.

33. How can you figure out the mechanical advantage of most block and falls by glance?
Direction - speed or size of the force applied.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.

34. The bevel gear is used to connect what?
Shafts lying at any given angle.
your arm.
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.

35. What is the third thing a gear can do?
Increase or decrease the the speed of the applied motion.
In Horsepower.
Magnify or reduce the force which you apply.
In pounds.

36. The threads of a screw are cut so?
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.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.
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

37. 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.
Simple machine
32/8 = 4
To magnify the applied force.

38. What direction does the effort and resistance move in third class levers.
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.
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

39. What type of lever provides a fractional mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.

40. What is the formula for the wheel and axle?
In Horsepower.
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
2(pie)/pitch
fulcrum- weight- effort

41. Gears can do a job for you by changing what three things?
Simple machine
1
Direction - speed or size of the force applied.
Two surfaces move against one another.

42. Fractional 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. Each half of the rope carries an equal amount of weight.
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.

43. What is the power formula?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Power=Work/Time

44. 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
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

45. What kind of machine is the inclined plane?
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
45
Simple machine

46. How is work done?
Simple machine
Foot- pounds
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.

47. What are the 4 forces?
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
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

48. How do you find the mechanical advantage?
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil
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.

49. How can you decrease friction on flat surfaces?
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
With oil - grease or soap.
In Horsepower.

50. With a single fixed sheave what is the only mechanical advantage?
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
The change of the direction of the pull.