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. Fractional mechanical advantage
A modification of an inclined plane.
Door knob.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

2. What is an example of a third class lever?
Simple machine
your arm.
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

3. How is distance measured in work?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
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.

4. What is the mechanical advantage of a single movable block?
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
Same.
Same.

5. The threads of a screw are cut so?
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

6. What is one type of second class lever?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.

7. 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.
Two surfaces move against one another.
your arm.
Same.

8. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.

9. What direction does the effort and resistance move in first class levers?
The change of the direction of the pull.
Opposite.
Two surfaces move against one another.
A few thousandths of an inch.

10. What is the lever formula?
Magnify or reduce the force which you apply.
Positive mechanical advantage.
Equals the weight of the object being hoisted.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

11. 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?
In Horsepower.
32/8 = 4
Same.
Foot- pounds

12. What does a micrometer measure?
The force used to overcome friction is greater than the force used to do useful work.
A few thousandths of an inch.
Opposite.
Less than 1.

13. How is force measured in work?
Positive mechanical advantage.
your arm.
In pounds.
Wheel and axle.

14. Work is measured in units also known as?
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

15. What direction does the effort and resistance move in third class levers.
Same.
2. Each half of the rope carries an equal amount of weight.
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.

16. What direction does the effort and resistance move in the second class levers?
Simple machine
Same.
Connects shafts having a 90 degree angle.
2(pie)/pitch

17. What is another way to find the mechanical advantage of an inclined plane?
2(pie)/pitch
Length of ramp/length of height from floor to truck
With oil - grease or soap.
your arm.

18. What is another example of a wheel and axle?
Door knob.
A few thousandths of an inch.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.

19. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
To magnify the applied force.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

20. What is the power formula?
Power=Work/Time
To speed up the motion of resistence.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.

21. What is the theoretical mechanical advantage of any gear train?
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.

22. What is the purpose of a third class lever?
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Foot- pounds

23. The miter gear faces are beveled at what angle?
2. Each half of the rope carries an equal amount of weight.
45
1
Wheel and axle.

24. What is the jack screw used for?
your arm.
To raise a house or other heavy machinery.
Can change the direction of motion.
Wheel and axle.

25. What kind of mechanical advantage does the first and second class lever provide?
In Horsepower.
Gravity - Magnetism - Friction - Recoil
The rope that passes through your hands is greater than the distance that the load is raised.
Positive mechanical advantage.

26. How do you measure power?
Foot- pounds
To magnify the applied force.
Same.
In Horsepower.

27. Formula for fractional mechanical disadvantage.
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.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time

28. How is work done?
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Opposite.

29. What is the work formula?
Work=Force*Distance
Same.
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.

30. The bevel gear is used to connect what?
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.
Shafts lying at any given angle.
Feet.

31. What type of lever provides a fractional mechanical advantage?
Same.
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Length of ramp/length of height from floor to truck

32. What is the second 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.
Same.
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.

33. 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.
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.
Opposite.

34. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Equals the weight of the object being hoisted.
Same.
Opposite.

35. An egg beater has a mechanical advantage of what?
45
Less than 1.
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

36. What is the mechanical advantage for a single fixed block?
1
Opposite.
Shafts lying at any given angle.
45

37. How can you decrease friction on flat surfaces?
A screw and a spur gear.
With oil - grease or soap.
A few thousandths of an inch.
Length of ramp/length of height from floor to truck

38. What is the formula for the wheel and axle?
Same.
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
To raise a house or other heavy machinery.

39. What are the 4 forces?
Same.
32/8 = 4
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil

40. 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.
Foot- pounds
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.

41. Class two lever
Power=Work/Time
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.

42. What are first and third class levers used for?
Shafts lying at any given angle.
In Horsepower.
Direction - speed or size of the force applied.
To magnify the applied force.

43. hat is a screw?
Same.
To speed up the motion of resistence.
In pounds.
A modification of an inclined plane.

44. What kind of machine is the inclined plane?
1
Work=Force*Distance
Power=Work/Time
Simple machine

45. Gears can do a job for you by changing what three things?
32/8 = 4
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
Direction - speed or size of the force applied.

46. A miter gear connects what?
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.
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.

47. The worm gear is a combination of what?
In pounds.
Foot- pounds
Door knob.
A screw and a spur gear.

48. What is the first thing a gear can do?
Positive mechanical advantage.
A few thousandths of an inch.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

49. Friction is involved when?
Count the number of parts of the rope going to and from the movable block.
your arm.
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.

50. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
Foot- pounds
2(pie)/pitch
Door knob.