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. What is the mechanical advantage for a single fixed block?
1
Work=Force*Distance
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.


2. What is an example of a third class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.
your arm.
Work=Force*Distance


3. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
Length of ramp/length of height from floor to truck


4. Formula for fractional mechanical disadvantage.
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck
Same.


5. A miter gear connects what?
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.


6. What direction does the effort and resistance move in the second class levers?
Feet.
To speed up the motion of resistence.
In Horsepower.
Same.


7. What is the formula for the wheel and axle?
Third class lever.
Two surfaces move against one another.
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


8. The worm gear is a combination of what?
2. Each half of the rope carries an equal amount of weight.
Less than 1.
A screw and a spur gear.
Can change the direction of motion.


9. What direction does the effort and resistance move in third class levers.
your arm.
Door knob.
Same.
Can change the direction of motion.


10. What is the theoretical mechanical advantage of any gear train?
To speed up the motion of resistence.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.


11. How do you measure power?
In Horsepower.
With oil - grease or soap.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.


12. 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
With oil - grease or soap.
Direction - speed or size of the force applied.
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


13. The miter gear faces are beveled at what angle?
Can change the direction of motion.
Third class lever.
45
Less than 1.


14. What is the third thing a gear can do?
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.


15. What are first and third class levers used for?
2(pie)/pitch
To magnify the applied force.
Third class lever.
1


16. Friction is involved when?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
Length of ramp/length of height from floor to truck
Two surfaces move against one another.


17. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In Horsepower.
fulcrum- weight- effort
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.


18. The threads of a screw are cut so?
Equals the weight of the object being hoisted.
Simple machine
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.


19. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Third class lever.
Power=Work/Time
Door knob.


20. What is the second thing a gear can do?
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Door knob.


21. What is the ratio of any gear train?
Third class lever.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.
To raise a house or other heavy machinery.


22. What is the jack screw used for?
To raise a house or other heavy machinery.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.


23. What direction does the effort and resistance move in first class levers?
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
To magnify the applied force.
Opposite.


24. What kind of machine is the inclined plane?
Wheel and axle.
To magnify the applied force.
A few thousandths of an inch.
Simple machine


25. An egg beater has a mechanical advantage of what?
Foot- pounds
In pounds.
Less than 1.
32/8 = 4


26. What is the mechanical advantage of a single movable block?
In pounds.
2. Each half of the rope carries an equal amount of weight.
45
32/8 = 4


27. How is force measured in work?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
In pounds.


28. What is another example of a wheel and axle?
In Horsepower.
Door knob.
Same.
To magnify the applied force.


29. What type of lever provides a fractional mechanical advantage?
Power=Work/Time
Less than 1.
Third class lever.
Same.


30. What are the 4 forces?
Can change the direction of motion.
32/8 = 4
45
Gravity - Magnetism - Friction - Recoil


31. hat is a screw?
A modification of an inclined plane.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
With oil - grease or soap.


32. How do you find the mechanical advantage?
Less than 1.
Equals the weight of the object being hoisted.
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.
32/8 = 4


33. How is work done?
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.
In Horsepower.
Door knob.


34. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The force used to overcome friction is greater than the force used to do useful work.
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.


35. Class two lever
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.


36. Work is measured in units also known as?
The rope that passes through your hands is greater than the distance that the load is raised.
Foot- pounds
Opposite.
With oil - grease or soap.


37. With a single fixed sheave what is the only mechanical advantage?
Positive mechanical advantage.
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.
your arm.


38. What does a micrometer measure?
A few thousandths of an inch.
fulcrum- weight- effort
Direction - speed or size of the force applied.
Door knob.


39. The bevel gear is used to connect what?
Same.
Shafts lying at any given angle.
your arm.
1


40. What is one type of second class lever?
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
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
Wheel and axle.


41. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
In 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.


42. What is the work formula?
Shafts lying at any given angle.
Two surfaces move against one another.
Simple machine
Work=Force*Distance


43. What is the power formula?
Increase or decrease the the speed of the applied motion.
Same.
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.
Power=Work/Time


44. How is distance measured in work?
Door knob.
Positive mechanical advantage.
To raise a house or other heavy machinery.
Feet.


45. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
fulcrum- weight- effort


46. What is the purpose of a third class lever?
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.
A few thousandths of an inch.
Two surfaces move against one another.


47. What is the first thing a gear can do?
45
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.


48. How can you decrease friction on flat surfaces?
Simple machine
With oil - grease or soap.
To magnify the applied force.
32/8 = 4


49. 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.
Connects shafts having a 90 degree angle.
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.


50. What is another way to find the mechanical advantage of an inclined plane?
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.