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. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
1
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.

2. hat is a screw?
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.
Can change the direction of motion.
A modification of an inclined plane.

3. What direction does the effort and resistance move in the second class levers?
Power=Work/Time
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

4. What are the 4 forces?
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.
Same.
Gravity - Magnetism - Friction - Recoil

5. What is the work formula?
To speed up the motion of resistence.
Opposite.
Work=Force*Distance
To raise a house or other heavy machinery.

6. What is the mechanical advantage of a single movable block?
In Horsepower.
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.
Shafts lying at any given angle.

7. An egg beater has a mechanical advantage of what?
your arm.
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.

8. What is another way to find the mechanical advantage of an inclined plane?
Same.
2(pie)/pitch
Length of ramp/length of height from floor to truck
Two surfaces move against one another.

9. Fractional mechanical advantage
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
The change of the direction of the pull.

10. 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
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.
In pounds.

11. What does a micrometer measure?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.

12. The miter gear faces are beveled at what angle?
Foot- pounds
45
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

13. Friction is involved when?
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
2(pie)/pitch
With oil - grease or soap.

14. How can you figure out the mechanical advantage of most block and falls by glance?
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.
1
Count the number of parts of the rope going to and from the movable block.

15. What is the purpose of a third class lever?
Same.
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
To speed up the motion of resistence.

16. What is the jack screw used for?
A screw and a spur gear.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
Same.

17. What is another example of a wheel and axle?
Door knob.
Same.
Can change the direction of motion.
Wheel and axle.

18. What kind of machine is the inclined plane?
Same.
A few thousandths of an inch.
Simple machine
Third class lever.

19. How is force measured in work?
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
In pounds.
Foot- pounds

20. Formula for fractional mechanical disadvantage.
Length of ramp/length of height from floor to truck
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.

21. How is distance measured in work?
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
Work=Force*Distance

22. 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.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil

23. 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?
Magnify or reduce the force which you apply.
To magnify the applied force.
Shafts lying at any given angle.
32/8 = 4

24. The threads of a screw are cut so?
Wheel and axle.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
2(pie)/pitch

25. What direction does the effort and resistance move in third class levers.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

26. The bevel gear is used to connect what?
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
Work=Force*Distance
Shafts lying at any given angle.
Simple machine

27. The worm gear is a combination of what?
Work=Force*Distance
A screw and a spur gear.
Length of ramp/length of height from floor to truck
Third class lever.

28. What are first and third class levers 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.
To speed up the motion of resistence.
2(pie)/pitch
To magnify the applied force.

29. What direction does the effort and resistance move in first 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
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
Opposite.

30. What is the third thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Power=Work/Time

31. What is the lever formula?
fulcrum- weight- effort
Same.
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.

32. What type of lever provides a fractional mechanical advantage?
A modification of an inclined plane.
Increase or decrease the the speed of the applied motion.
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.
Third class lever.

33. What is the first thing a gear can do?
Increase or decrease the the speed of the applied motion.
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.
Can change the direction of 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.

34. What is the power formula?
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.
Power=Work/Time
To magnify the applied force.

35. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Door knob.
To raise a house or other heavy machinery.
Same.

36. What kind of mechanical advantage does the first and second class lever provide?
your arm.
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
Positive mechanical advantage.

37. How is work done?
1
Opposite.
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.

38. Work is measured in units also known as?
Magnify or reduce the force which you apply.
Foot- pounds
In pounds.
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. 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.
your arm.
Direction - speed or size of the force applied.
Less than 1.

40. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
2(pie)/pitch

41. Class two lever
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
To raise a house or other heavy machinery.
With oil - grease or soap.

42. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Increase or decrease the the speed of the applied motion.
45
Simple machine

43. How can you decrease friction on flat surfaces?
In Horsepower.
Equals the weight of the object being hoisted.
A modification of an inclined plane.
With oil - grease or soap.

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.
To speed up the motion of resistence.
Shafts lying at any given 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.

45. What is one type of second class lever?
Length of ramp/length of height from floor to truck
Wheel and axle.
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.

46. 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.
Length of ramp/length of height from floor to truck
Less than 1.
With oil - grease or soap.

47. A miter gear connects what?
Work=Force*Distance
Foot- pounds
Connects shafts having a 90 degree angle.
The force used to overcome friction is greater than the force used to do useful work.

48. What is the mechanical advantage for a single fixed block?
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
1

49. What is an example of a third class lever?
your arm.
Power=Work/Time
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
Same.

50. What is the second thing a gear can do?
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.
1
Increase or decrease the the speed of the applied motion.