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 purpose of a third class lever?
To speed up the motion of resistence.
your arm.
Door knob.
Wheel and axle.

2. What type of lever provides a fractional mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.
Shafts lying at any given angle.

3. What direction does the effort and resistance move in the second class levers?
Shafts lying at any given angle.
Same.
2(pie)/pitch
To magnify the applied force.

4. What is one type of second class lever?
1
Shafts lying at any given angle.
Direction - speed or size of the force applied.
Wheel and axle.

5. 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. Each half of the rope carries an equal amount of weight.
Simple machine
To raise a house or other heavy machinery.

6. How do you measure power?
2. Each half of the rope carries an equal amount of weight.
In Horsepower.
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What is the mechanical advantage for a single fixed block?
Same.
2. Each half of the rope carries an equal amount of weight.
1
Work=Force*Distance

8. The miter gear faces are beveled at what angle?
Wheel and axle.
Third class 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.
45

9. Class two lever
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Equals the weight of the object being hoisted.
A few thousandths of an inch.

10. What is an example of a third class lever?
your arm.
Shafts lying at any given angle.
Two surfaces move against one another.
Magnify or reduce the force which you apply.

11. What does a micrometer measure?
Magnify or reduce the force which you apply.
Door knob.
A few thousandths of an inch.
Work=Force*Distance

12. A miter gear connects what?
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.

13. Friction is involved when?
Two surfaces move against one another.
1
Magnify or reduce the force which you apply.
Wheel and axle.

14. What are first and third class levers used for?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
To magnify the applied force.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

15. How is force measured in work?
Power=Work/Time
With oil - grease or soap.
2(pie)/pitch
In pounds.

16. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
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.
fulcrum- weight- effort

17. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Feet.
To speed up the motion of resistence.
Can change the direction of motion.

18. How is work done?
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
45

19. What kind of machine is the inclined plane?
Third class lever.
Two surfaces move against one another.
fulcrum- weight- effort
Simple machine

20. What is the formula for the wheel and axle?
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
Opposite.
When a resistance is overcome by a force acting through a measurable distance.

21. What is the work formula?
Work=Force*Distance
With oil - grease or soap.
Connects shafts having a 90 degree angle.
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.

22. What is the lever formula?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Simple machine
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

23. How is distance measured in work?
Simple machine
Direction - speed or size of the force applied.
Feet.
Length of ramp/length of height from floor to truck

24. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Simple machine
45
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

25. What kind of mechanical advantage does the first and second class lever provide?
Feet.
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.
Positive mechanical advantage.

26. What direction does the effort and resistance move in first class levers?
Feet.
Can change the direction of motion.
Opposite.
With oil - grease or soap.

27. How can you decrease friction on flat surfaces?
1
Simple machine
With oil - grease or soap.
Can change the direction of motion.

28. What is the second thing a gear can do?
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.

29. What is the third thing a gear can do?
Increase or decrease the the speed of the applied motion.
32/8 = 4
Can change the direction of motion.
Magnify or reduce the force which you apply.

30. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Simple machine
Foot- pounds

31. How can you figure out the mechanical advantage of most block and falls by glance?
32/8 = 4
To raise a house or other heavy machinery.
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
Count the number of parts of the rope going to and from the movable block.

32. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
In Horsepower.
To magnify the applied force.
Positive mechanical advantage.

33. What is another example of a wheel and axle?
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.
Less than 1.

34. With a single fixed sheave what is the only mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.

35. What is the formula for the mechanical advantage of a screw?
45
Two surfaces move against one another.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

36. What is the first thing a gear can do?
Same.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.

37. The bevel gear is used to connect what?
Positive mechanical advantage.
Same.
A modification of an inclined plane.
Shafts lying at any given angle.

38. What direction does the effort and resistance move in third class levers.
45
Equals the weight of the object being hoisted.
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.

39. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.
Power=Work/Time

40. What is the jack screw used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
A few thousandths of an inch.
Direction - speed or size of the force applied.

41. hat is a screw?
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.

42. What is the power formula?
Magnify or reduce the force which you apply.
Same.
Power=Work/Time
A few thousandths of an inch.

43. An egg beater has a mechanical advantage of what?
Direction - speed or size of the force applied.
Less than 1.
32/8 = 4
Two surfaces move against one another.

44. 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.
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
Third class lever.

45. Formula for fractional mechanical disadvantage.
32/8 = 4
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2. Each half of the rope carries an equal amount of weight.

46. The worm gear is a combination of what?
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.
A screw and a spur gear.
Length of ramp/length of height from floor to truck

47. How do you find the mechanical advantage?
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time
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.
To magnify the applied force.

48. Gears can do a job for you by changing what three things?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.

49. What is the ratio of any gear train?
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 magnify the applied force.
A few thousandths of an inch.
The change of the direction of the pull.

50. What is the mechanical advantage of a single movable block?
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.
Opposite.
Work=Force*Distance