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 work formula?
Direction - speed or size of the force applied.
Feet.
1
Work=Force*Distance

2. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
Work=Force*Distance
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

3. What is the purpose of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Shafts lying at any given angle.
To speed up the motion of resistence.

4. What is the third thing a gear can do?
fulcrum- weight- effort
32/8 = 4
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.

5. The bevel gear is used to connect what?
Shafts lying at any given angle.
Door knob.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.

6. Fractional mechanical advantage
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

7. The worm gear is a combination of what?
2(pie)/pitch
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 screw and a spur gear.
your arm.

8. How do you find the mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
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.

9. Work is measured in units also known as?
Increase or decrease the the speed of the applied motion.
your arm.
Foot- pounds
2. Each half of the rope carries an equal amount of weight.

10. What does a micrometer measure?
In pounds.
A few thousandths of an inch.
Connects shafts having a 90 degree 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.

11. 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.
1
Simple machine
Increase or decrease the the speed of the applied motion.

12. What is the mechanical advantage for a single fixed block?
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A screw and a spur gear.
To speed up the motion of resistence.

13. What is the ratio of any gear train?
Simple machine
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.
A few thousandths of an inch.

14. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
1
To magnify the applied force.
Magnify or reduce the force which you apply.

15. What kind of mechanical advantage does the first and second class lever provide?
Same.
Positive mechanical advantage.
A screw and a spur gear.
45

16. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil

17. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
fulcrum- weight- effort
Same.
Gravity - Magnetism - Friction - Recoil

18. What kind of machine is the inclined plane?
Door knob.
1
Simple machine
A screw and a spur gear.

19. 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.
Feet.
2(pie)/pitch
Length of ramp/length of height from floor to truck

20. Friction is involved when?
Two surfaces move against one another.
Shafts lying at any given angle.
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

21. What is another example of a wheel and axle?
Simple machine
Door knob.
2. Each half of the rope carries an equal amount of weight.
your arm.

22. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.

23. What is the mechanical advantage of a single movable block?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
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.

24. What is an example of a third class lever?
Equals the weight of the object being hoisted.
your arm.
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

25. What is the theoretical mechanical advantage of any gear train?
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.

26. The threads of a screw are cut so?
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.
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.

27. What is one type of second class lever?
Wheel and axle.
Length of ramp/length of height from floor to truck
With oil - grease or soap.
In pounds.

28. How is force measured in work?
In pounds.
Opposite.
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.

29. An egg beater has a mechanical advantage of what?
Less than 1.
your arm.
Two surfaces move against one another.
2(pie)/pitch

30. Class two lever
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 modification of an inclined plane.
The change of the direction of the pull.
fulcrum- weight- effort

31. What type of lever provides a fractional mechanical advantage?
A screw and a spur gear.
Third class lever.
Feet.
A modification of an inclined plane.

32. A miter gear connects what?
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.
Foot- pounds
2(pie)/pitch

33. What are the 4 forces?
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
Simple machine

34. How is work done?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Can change the direction of motion.

35. What is the first thing a gear can do?
To speed up the motion of resistence.
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.

36. 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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

37. What direction does the effort and resistance move in first class levers?
2(pie)/pitch
Simple machine
Same.
Opposite.

38. What direction does the effort and resistance move in third class levers.
Same.
Count the number of parts of the rope going to and from the movable block.
your arm.
With oil - grease or soap.

39. What are first and third class levers used for?
The change of the direction of the pull.
To magnify the applied force.
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.

40. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Same.

41. The miter gear faces are beveled at what angle?
Work=Force*Distance
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.
45

42. What is another way to find the mechanical advantage of an inclined plane?
Opposite.
Length of ramp/length of height from floor to truck
Power=Work/Time
Increase or decrease the the speed of the applied motion.

43. How do you measure power?
Two surfaces move against one another.
In Horsepower.
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

44. What is the lever formula?
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.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.

45. What is the jack screw used for?
Third class lever.
Power=Work/Time
Opposite.
To raise a house or other heavy machinery.

46. hat is a screw?
your arm.
Simple machine
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.

47. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.

48. What is the power formula?
Power=Work/Time
Work=Force*Distance
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

49. What is the formula for the wheel and axle?
Simple machine
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

50. 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
Work=Force*Distance
Opposite.
With oil - grease or soap.