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. 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.
45
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.

2. What is the theoretical mechanical advantage of any gear train?
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time
32/8 = 4

3. What type of lever provides a fractional mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Third class lever.
Door knob.
Gravity - Magnetism - Friction - Recoil

4. 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.
Same.
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
Door knob.

5. 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.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.

6. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Door knob.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.

7. What is the power formula?
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.
Power=Work/Time
1
Equals the weight of the object being hoisted.

8. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

9. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.

10. What is the mechanical advantage for a single fixed block?
1
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.

11. What is the third thing a gear can do?
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.
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.

12. Class two lever
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
fulcrum- weight- effort

13. What are the 4 forces?
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Opposite.
Gravity - Magnetism - Friction - Recoil

14. 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?
Length of ramp/length of height from floor to truck
Feet.
32/8 = 4
Equals the weight of the object being hoisted.

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

16. How is force measured in work?
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.
In pounds.
The change of the direction of the pull.
Less than 1.

17. What is the purpose of a third class lever?
With oil - grease or soap.
Same.
In pounds.
To speed up the motion of resistence.

18. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Opposite.
Two surfaces move against one another.
A screw and a spur gear.

19. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.
Same.
your arm.

20. An egg beater has a mechanical advantage of what?
Less than 1.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
Shafts lying at any given angle.

21. How is distance measured in work?
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort

22. With a single fixed sheave what is the only 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.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
The change of the direction of the pull.

23. What kind of machine is the inclined plane?
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.

24. What is the second thing a gear can do?
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
32/8 = 4
Less than 1.

25. What is one type of second class lever?
In pounds.
With oil - grease or soap.
Wheel and axle.
Same.

26. What direction does the effort and resistance move in the second class levers?
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
Mechanical disadvantage. Use more force than the force of the load you lift.
Length of ramp/length of height from floor to truck
Same.

27. What is the formula for the wheel and axle?
The force used to overcome friction is greater than the force used to do useful work.
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
Length of ramp/length of height from floor to truck

28. What is the work formula?
Work=Force*Distance
fulcrum- weight- effort
Two surfaces move against one another.
Positive mechanical advantage.

29. Work is measured in units also known as?
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.
Foot- pounds
1

30. Gears can do a job for you by changing what three things?
With oil - grease or soap.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4

31. What is the jack screw used for?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
To raise a house or other heavy machinery.

32. The bevel gear is used to connect what?
Shafts lying at any given angle.
To speed up the motion of resistence.
Can change the direction of motion.
Simple machine

33. hat is a screw?
A screw and a spur gear.
Length of ramp/length of height from floor to truck
Foot- pounds
A modification of an inclined plane.

34. What is another way to find the mechanical advantage of an inclined plane?
32/8 = 4
In pounds.
Length of ramp/length of height from floor to truck
1

35. What does a micrometer measure?
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

36. How do you find the mechanical advantage?
1
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.
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.

37. The worm gear is a combination of what?
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine
A screw and a spur gear.

38. What is an example of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
your arm.
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.

39. What is the ratio of any gear train?
1
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. A miter gear connects what?
32/8 = 4
Connects shafts having a 90 degree angle.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

41. What are first and third class levers used for?
To magnify the applied force.
To speed up the motion of resistence.
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.

42. How do you measure power?
Opposite.
In Horsepower.
Increase or decrease the the speed of the applied motion.
your arm.

43. What is the first thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.

44. How is work done?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.
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

45. What is the mechanical advantage of a single movable block?
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Positive mechanical advantage.

46. Friction is involved when?
To magnify the applied force.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort

47. What direction does the effort and resistance move in first class levers?
Opposite.
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

48. What direction does the effort and resistance move in third class levers.
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds
Same.
Power=Work/Time

49. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.

50. Fractional mechanical advantage
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Magnify or reduce the force which you apply.