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. Class two lever
With oil - grease or soap.
fulcrum- weight- effort
Shafts lying at any given angle.
To speed up the motion of resistence.

2. What is the jack screw used for?
In pounds.
Same.
To raise a house or other heavy machinery.
Work=Force*Distance

3. What kind of mechanical advantage does the first and second class lever provide?
Foot- pounds
Positive mechanical advantage.
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.

4. Formula for fractional mechanical disadvantage.
Increase or decrease the the speed of the applied motion.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time

5. Fractional mechanical advantage
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

6. What is the theoretical mechanical advantage of any gear train?
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
Less than 1.
Can change the direction of motion.

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

8. What is another example of a wheel and axle?
A modification of an inclined plane.
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.
A few thousandths of an inch.

9. What direction does the effort and resistance move in third class levers.
Equals the weight of the object being hoisted.
Opposite.
32/8 = 4
Same.

10. How is distance measured in work?
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil

11. What is the second thing a gear can do?
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

12. What are first and third class levers used for?
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.
To magnify the applied force.
A modification of an inclined plane.

13. What kind of machine is the inclined plane?
Simple machine
Third class lever.
Foot- pounds
45

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?
32/8 = 4
Shafts lying at any given angle.
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.

15. What is the ratio of any gear train?
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch

16. An egg beater has a mechanical advantage of what?
Foot- pounds
45
Door knob.
Less than 1.

17. The miter gear faces are beveled at what angle?
45
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A modification of an inclined plane.

18. How can you decrease friction on flat surfaces?
In Horsepower.
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.
Simple machine

19. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
1
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.

20. What is the mechanical advantage for a single fixed block?
1
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.

21. What type of lever provides a fractional mechanical advantage?
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
Third class lever.
Feet.

22. Gears can do a job for you by changing what three things?
1
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
Shafts lying at any given angle.

23. What is the mechanical advantage of a single movable block?
Simple machine
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.

24. What is the formula for the mechanical advantage of a screw?
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

25. What is an example of a third class lever?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.

26. How do you measure power?
Feet.
To raise a house or other heavy machinery.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.

27. What is the formula for the wheel and axle?
Foot- pounds
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
Positive mechanical advantage.
Door knob.

28. What direction does the effort and resistance move in the second class levers?
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
2(pie)/pitch
Same.

29. How is force measured in work?
The change of the direction of the pull.
Magnify or reduce the force which you apply.
Power=Work/Time
In pounds.

30. What is the purpose of a third class lever?
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Less than 1.

31. hat is a screw?
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.
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
Feet.

32. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
Feet.

33. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
A modification of an inclined plane.
Door knob.

34. 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.
In pounds.
Shafts lying at any given angle.
45

35. Work is measured in units also known as?
Foot- pounds
The change of the direction of the pull.
Less than 1.
Simple machine

36. What is the power formula?
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
Power=Work/Time

37. What is the work formula?
Third class lever.
Work=Force*Distance
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.

38. What are the 4 forces?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
In pounds.

39. A miter gear connects what?
Direction - speed or size of the force applied.
A screw and a spur gear.
32/8 = 4
Connects shafts having a 90 degree angle.

40. The worm gear is a combination of what?
The change of the direction of the pull.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A screw and a spur gear.

41. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To raise a house or other heavy machinery.
In pounds.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.

42. The bevel gear is used to connect what?
Length of ramp/length of height from floor to truck
Can change the direction of motion.
Shafts lying at any given angle.
Power=Work/Time

43. What is one type of second class lever?
With oil - grease or soap.
Third class lever.
Power=Work/Time
Wheel and axle.

44. With a single fixed sheave what is the only mechanical advantage?
In pounds.
To speed up the motion of resistence.
The change of the direction of the pull.
Power=Work/Time

45. What direction does the effort and resistance move in first class levers?
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

46. How is work done?
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.
Door knob.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

47. How can you figure out the mechanical advantage of most block and falls by glance?
A screw and a spur gear.
32/8 = 4
Count the number of parts of the rope going to and from the 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.

48. What does a micrometer measure?
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.

49. What is the first thing a gear can do?
32/8 = 4
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.

50. 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.
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.