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. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
45
To raise a house or other heavy machinery.


2. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
Feet.
Length of ramp/length of height from floor to truck
Work=Force*Distance


3. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
Door knob.
Two surfaces move against one another.
The change of the direction of the pull.


4. How is force measured in work?
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.
A modification of an inclined plane.
In pounds.
To magnify the applied force.


5. What is the mechanical advantage for a single fixed block?
Same.
1
Count the number of parts of the rope going to and from the movable block.
32/8 = 4


6. What is the jack screw used for?
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.


7. What is one type of second class lever?
Length of ramp/length of height from floor to truck
Wheel and axle.
A modification of an inclined plane.
Third class lever.


8. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Simple machine
To magnify the applied force.


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


10. What is the ratio of any gear train?
With oil - grease or soap.
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.


11. What direction does the effort and resistance move in the second class levers?
To speed up the motion of resistence.
Same.
The force used to overcome friction is greater than the force used to do useful work.
Door knob.


12. What direction does the effort and resistance move in first class levers?
A screw and a spur gear.
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
Opposite.


13. 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.
45
Magnify or reduce the force which you apply.
A modification of an inclined plane.


14. What are first and third class levers used for?
Length of ramp/length of height from floor to truck
To magnify the applied force.
Less than 1.
Magnify or reduce the force which you apply.


15. 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
To raise a house or other heavy machinery.
fulcrum- weight- effort
To magnify the applied force.


16. What is the purpose of a third class lever?
1
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
your arm.


17. How do you find the mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
1
Wheel and axle.
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.


18. An egg beater has a mechanical advantage of what?
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
A screw and a spur gear.


19. What direction does the effort and resistance move in third class levers.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Same.
fulcrum- weight- effort


20. What is the power formula?
Feet.
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time


21. Work is measured in units also known as?
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
Foot- pounds
With oil - grease or soap.
Power=Work/Time


22. 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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.


23. How is work done?
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.
When a resistance is overcome by a force acting through a measurable distance.
your arm.


24. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
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.
Mechanical disadvantage. Use more force than the force of the load you lift.


25. Class two lever
A few thousandths of an inch.
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.
fulcrum- weight- effort


26. A miter gear connects what?
Connects shafts having a 90 degree angle.
To magnify the applied force.
Length of ramp/length of height from floor to truck
With oil - grease or soap.


27. Formula for fractional mechanical disadvantage.
A modification of an inclined plane.
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1


28. What kind of mechanical advantage does the first and second class lever provide?
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.
Positive mechanical advantage.


29. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Feet.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.


30. What kind of machine is the inclined plane?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
Feet.
Simple machine


31. The bevel gear is used to connect what?
The change of the direction of the pull.
Shafts lying at any given angle.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil


32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Power=Work/Time
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.


33. What is an example of a third class lever?
Can change the direction of motion.
To magnify the applied force.
your arm.
2. Each half of the rope carries an equal amount of weight.


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


35. 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
your arm.
1
Two surfaces move against one another.


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


37. With a single fixed sheave what is the only mechanical advantage?
Power=Work/Time
your arm.
Opposite.
The change of the direction of the pull.


38. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.
Two surfaces move against one another.


39. What is the first thing a gear can do?
Equals the weight of the object being hoisted.
Can change the direction of motion.
Same.
Simple machine


40. What type of lever provides a fractional mechanical advantage?
Gravity - Magnetism - Friction - Recoil
32/8 = 4
Same.
Third class lever.


41. How is distance measured in work?
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
Feet.
To speed up the motion of resistence.


42. What are the 4 forces?
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
Less than 1.
Increase or decrease the the speed of the applied motion.


43. The worm gear is a combination of what?
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.


44. The miter gear faces are beveled at what 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
Simple machine
Length of ramp/length of height from floor to truck


45. Fractional mechanical advantage
Same.
Wheel and axle.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.


46. What is the formula for the mechanical advantage of a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
Connects shafts having a 90 degree angle.
2(pie)/pitch


47. What is the third thing a gear can do?
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.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil


48. How can you decrease friction on flat surfaces?
Positive mechanical advantage.
Third class lever.
In Horsepower.
With oil - grease or soap.


49. What does a micrometer measure?
Simple machine
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.
Opposite.


50. What is the work formula?
Shafts lying at any given 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.
Work=Force*Distance
Increase or decrease the the speed of the applied motion.