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. A miter gear connects what?
Wheel and axle.
Connects shafts having a 90 degree angle.
Power=Work/Time
32/8 = 4

2. The bevel gear is used to connect what?
Can change the direction of motion.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
Foot- pounds

3. An egg beater has a mechanical advantage of what?
Less than 1.
Count the number of parts of the rope going to and from the movable block.
your arm.
Power=Work/Time

4. What is the first thing a gear can do?
Can change the direction of motion.
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Simple machine

5. What are the 4 forces?
Third class lever.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

6. Fractional mechanical advantage
1
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
Can change the direction of motion.

7. How is force measured in work?
Increase or decrease the the speed of the applied motion.
In pounds.
With oil - grease or soap.
To magnify the applied force.

8. What is the jack screw used for?
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
In Horsepower.
To raise a house or other heavy machinery.
2(pie)/pitch

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

10. What direction does the effort and resistance move in the second class levers?
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
Same.

11. What is the work formula?
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
Work=Force*Distance
Length of ramp/length of height from floor to truck

12. How can you decrease friction on flat surfaces?
Power=Work/Time
Can change the direction of motion.
With oil - grease or soap.
1

13. 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.
A screw and a spur gear.
Third class lever.
Wheel and axle.

14. What is the power formula?
The change of the direction of the pull.
With oil - grease or soap.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

15. What is one type of second class lever?
Wheel and axle.
Magnify or reduce the force which you apply.
Less than 1.
Direction - speed or size of the force applied.

16. What is the third thing a gear can do?
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
Same.

17. What does a micrometer measure?
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.
A few thousandths of an inch.

18. Formula for fractional mechanical disadvantage.
your arm.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

19. 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
Same.
Positive mechanical advantage.
Foot- pounds

20. How is work done?
Power=Work/Time
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.
When a resistance is overcome by a force acting through a measurable distance.

21. What are first and third class levers used for?
fulcrum- weight- effort
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

22. What is another example of a wheel and axle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
32/8 = 4
Door knob.
Same.

23. What is the mechanical advantage for a single fixed block?
Positive mechanical advantage.
1
45
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.

24. What direction does the effort and resistance move in third class levers.
2. Each half of the rope carries an equal amount of weight.
Door knob.
In pounds.
Same.

25. How do you measure power?
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
To magnify the applied force.

26. What is an example of a third class lever?
your arm.
To speed up the motion of resistence.
To raise a house or other heavy machinery.
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

27. 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.
Gravity - Magnetism - Friction - Recoil
your arm.
In pounds.

28. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
2(pie)/pitch
A few thousandths of an inch.

29. Friction is involved when?
Two surfaces move against one another.
With oil - grease or soap.
Same.
your arm.

30. Work is measured in units also known as?
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.

31. How is distance measured in work?
Wheel and axle.
Magnify or reduce the force which you apply.
Feet.
A screw and a spur gear.

32. What type of lever provides a fractional mechanical advantage?
In Horsepower.
Third class lever.
Power=Work/Time
Two surfaces move against one another.

33. What is the formula for the wheel and axle?
Shafts lying at any given angle.
your arm.
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
1

34. What is the ratio of any gear train?
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
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.

35. What is the purpose of a third class lever?
Can change the direction of motion.
Less than 1.
Wheel and axle.
To speed up the motion of resistence.

36. What is the second thing a gear can do?
2(pie)/pitch
Wheel and axle.
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.

37. 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.
45
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

38. hat is a screw?
fulcrum- weight- effort
A modification of an inclined plane.
Magnify or reduce the force which you apply.
Door knob.

39. What is another way to find the mechanical advantage of an inclined plane?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Opposite.
32/8 = 4
Length of ramp/length of height from floor to truck

40. Class two lever
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.
32/8 = 4

41. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
To magnify the applied force.
your arm.

42. The worm gear is a combination of what?
A modification of an inclined plane.
A screw and a spur gear.
Work=Force*Distance
your arm.

43. What kind of machine is the inclined plane?
Simple machine
To speed up the motion of resistence.
Feet.
With oil - grease or soap.

44. 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.
Shafts lying at any given angle.
Opposite.
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

45. 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.
Door knob.
Count the number of parts of the rope going to and from the movable block.
Foot- pounds

46. With a single fixed sheave what is the only mechanical advantage?
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
The change of the direction of the pull.
Simple machine

47. What direction does the effort and resistance move in first class levers?
Opposite.
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

48. How do you find the mechanical advantage?
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful 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.
To raise a house or other heavy machinery.

49. The miter gear faces are beveled at what angle?
Equals the weight of the object being hoisted.
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
45

50. Gears can do a job for you by changing what three things?
Opposite.
32/8 = 4
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.