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. The bevel gear is used to connect what?
Shafts lying at any given angle.
To magnify the applied force.
fulcrum- weight- effort
A few thousandths of an inch.


2. What is the mechanical advantage for a single fixed block?
Equals the weight of the object being hoisted.
1
Connects shafts having a 90 degree angle.
Opposite.


3. What type of lever provides a fractional mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
Less than 1.
Third class lever.


4. Class two lever
With oil - grease or soap.
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.
fulcrum- weight- effort


5. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
Same.


6. How do you find the mechanical advantage?
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
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.


7. What is another example of a wheel and axle?
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil
Door knob.
The force used to overcome friction is greater than the force used to do useful work.


8. What direction does the effort and resistance move in third class levers.
Less than 1.
Same.
your arm.
To magnify the applied force.


9. How do you measure power?
Same.
Work=Force*Distance
To magnify the applied force.
In Horsepower.


10. What is the work formula?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Third class lever.
Work=Force*Distance


11. hat is a screw?
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 modification of an inclined plane.
Two surfaces move against one another.
Door knob.


12. How is force measured in work?
Positive mechanical advantage.
32/8 = 4
In pounds.
Opposite.


13. The threads of a screw are cut so?
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
Opposite.


14. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.


15. Formula for fractional mechanical disadvantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.


16. What is the power formula?
Power=Work/Time
fulcrum- weight- effort
1
The change of the direction of the pull.


17. What is the first thing a gear can do?
Can change the direction of motion.
A screw and a spur gear.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.


18. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.


19. 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.
32/8 = 4
Direction - speed or size of the force applied.


20. Work is measured in units also known as?
In pounds.
Foot- 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.
Count the number of parts of the rope going to and from the movable block.


21. What kind of machine is the inclined plane?
1
In Horsepower.
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.


22. Fractional 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.
fulcrum- weight- effort
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.


23. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
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
When a resistance is overcome by a force acting through a measurable distance.


24. With a single fixed sheave what is the only mechanical advantage?
Less than 1.
To speed up the motion of resistence.
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil


25. The miter gear faces are beveled at what angle?
45
2. Each half of the rope carries an equal amount of weight.
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.


26. What is an example of a third class lever?
Power=Work/Time
your arm.
A modification of an inclined plane.
With oil - grease or soap.


27. What is another way to find the mechanical advantage of an inclined plane?
1
Count the number of parts of the rope going to and from the movable block.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.


28. What is the lever formula?
Same.
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 change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.


29. What kind of mechanical advantage does the first and second class lever provide?
The rope that passes through your hands is greater than the distance that the load is raised.
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
Feet.
Positive mechanical advantage.


30. 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.
Same.
1
To raise a house or other heavy machinery.


31. What is the second thing a gear can do?
Door knob.
Increase or decrease the the speed of the applied motion.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort


32. What does a micrometer measure?
Power=Work/Time
Simple machine
Positive mechanical advantage.
A few thousandths of an inch.


33. A miter gear connects what?
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
45
A modification of an inclined plane.


34. What is the ratio of any gear train?
With oil - grease or soap.
Simple machine
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Third class lever.


35. What direction does the effort and resistance move in first class levers?
The rope that passes through your hands is greater than the distance that the load is raised.
Gravity - Magnetism - Friction - Recoil
Opposite.
Work=Force*Distance


36. What is the jack screw used for?
Positive mechanical advantage.
Shafts lying at any given angle.
To raise a house or other heavy machinery.
1


37. 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
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds


38. How is distance measured in work?
Simple machine
your arm.
Work=Force*Distance
Feet.


39. An egg beater has a mechanical advantage of what?
Less than 1.
fulcrum- weight- effort
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.


40. What is the mechanical advantage of a single movable block?
Opposite.
2. Each half of the rope carries an equal amount of weight.
Simple machine
A screw and a spur gear.


41. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
fulcrum- weight- effort
A screw and a spur gear.
2(pie)/pitch


42. What is one type of second class lever?
Wheel and axle.
In Horsepower.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil


43. How can you decrease friction on flat surfaces?
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Direction - speed or size of the force applied.
Door knob.


44. The worm gear is a combination of what?
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.


45. How can you figure out the mechanical advantage of most block and falls by glance?
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.


46. What are first and third class levers used for?
your arm.
To magnify the applied force.
Two surfaces move against one another.
Door knob.


47. Friction is involved when?
A screw and a spur gear.
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.
Two surfaces move against one another.


48. What is the purpose of a third class lever?
To speed up the motion of resistence.
Can change the direction of motion.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.


49. 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.
A few thousandths of an inch.
32/8 = 4
Increase or decrease the the speed of the applied motion.


50. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
Two surfaces move against one another.
Equals the weight of the object being hoisted.