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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
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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 what is the only mechanical advantage?
Same.
Wheel and axle.
The change of the direction of the pull.
Shafts lying at any given angle.

2. What is an example of a third class lever?
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.

3. What is the third thing a gear can do?
Door knob.
Magnify or reduce the force which you apply.
Less than 1.
Connects shafts having a 90 degree angle.

4. How do you measure power?
Magnify or reduce the force which you apply.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.
In Horsepower.

5. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.

6. How is distance measured in work?
In Horsepower.
Feet.
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.

7. What type of lever provides a fractional mechanical advantage?
Same.
The change of the direction of the pull.
Same.
Third class lever.

8. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
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
Equals the weight of the object being hoisted.

9. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
Door knob.
32/8 = 4
The force used to overcome friction is greater than the force used to do useful work.

10. Class two lever
fulcrum- weight- effort
Feet.
A few thousandths of an inch.
A modification of an inclined plane.

11. What direction does the effort and resistance move in third class levers.
Connects shafts having a 90 degree angle.
Same.
32/8 = 4
Foot- pounds

12. What is the formula for the mechanical advantage of a screw?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Increase or decrease the the speed of the applied motion.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

13. 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
Work=Force*Distance
45
Same.

14. 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
A modification of an inclined plane.
Foot- pounds
fulcrum- weight- effort

15. What is the theoretical mechanical advantage of any gear train?
Shafts lying at any given angle.
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Length of ramp/length of height from floor to truck

16. What is the second thing a gear can do?
Door knob.
Increase or decrease the the speed of the applied motion.
Less than 1.
your arm.

17. Formula for fractional mechanical disadvantage.
To raise a house or other heavy machinery.
A screw and a spur gear.
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.

18. How can you decrease friction on flat surfaces?
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
With oil - grease or soap.

19. What is another way to find the mechanical advantage of an inclined plane?
A modification of an inclined plane.
fulcrum- weight- effort
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.

20. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Magnify or reduce the force which you apply.
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.

21. What is the ratio of any gear train?
Direction - speed or size of the force applied.
A few thousandths of an inch.
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.

22. What is the first thing a gear can do?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
Can change the direction of motion.
A modification of an inclined plane.

23. What kind of mechanical advantage does the first and second class lever provide?
Opposite.
Positive mechanical advantage.
2(pie)/pitch
Wheel and axle.

24. What is the power formula?
The change of the direction of the pull.
Wheel and axle.
Power=Work/Time
In Horsepower.

25. What is the jack screw used for?
Magnify or reduce the force which you apply.
Work=Force*Distance
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

26. What is the purpose of a third class lever?
Feet.
To speed up the motion of resistence.
Door knob.
Can change the direction of motion.

27. Work is measured in units also known as?
Feet.
fulcrum- weight- effort
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.
Foot- pounds

28. An egg beater has a mechanical advantage of what?
Less than 1.
Opposite.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
When a resistance is overcome by a force acting through a measurable distance.

29. Fractional mechanical advantage
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

30. Gears can do a job for you by changing what three things?
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
In pounds.
Direction - speed or size of the force applied.

31. 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
Connects shafts having a 90 degree 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.
With oil - grease or soap.

32. What is the mechanical advantage of a single movable block?
Door knob.
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.

33. What does a micrometer measure?
Gravity - Magnetism - Friction - Recoil
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.
A screw and a spur gear.

34. What are first and third class levers used for?
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.

35. What is another example of a wheel and axle?
2(pie)/pitch
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.

36. How do you find the mechanical advantage?
Third class lever.
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 raise a house or other heavy machinery.
Direction - speed or size of the force applied.

37. What direction does the effort and resistance move in first class levers?
Opposite.
Work=Force*Distance
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.

38. hat is a screw?
A modification of an inclined plane.
Same.
Can change the direction of motion.
Wheel and axle.

39. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
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.
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.

40. The bevel gear is used to connect what?
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.
Positive mechanical advantage.
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil

41. Friction is involved when?
Door knob.
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

42. How is force measured in work?
32/8 = 4
Foot- pounds
In pounds.
Same.

43. The miter gear faces are beveled at what angle?
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
To magnify the applied force.
45

44. The worm gear is a combination of 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
A screw and a spur gear.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

45. How can you figure out the mechanical advantage of most block and falls by glance?
Simple machine
Same.
Count the number of parts of the rope going to and from the movable block.
Opposite.

46. What is one type of second class lever?
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
To speed up the motion of resistence.

47. What is the mechanical advantage for a single fixed block?
2(pie)/pitch
Foot- pounds
Opposite.
1

48. What kind of machine is the inclined plane?
To speed up the motion of resistence.
Simple machine
Connects shafts having a 90 degree angle.
Same.

49. What is the work formula?
To magnify the applied force.
your arm.
Work=Force*Distance
Less than 1.

50. A miter gear connects what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.