1



Principles of Engineering Name:

Semester 1 Final Review

1. Describe the duties of an engineering technologist.

2. Give 5 characteristics of an engineering notebook.

3. Draw and describe the following levers:

a. First-class –

b. Second-class –

c. Third-class –

4. In a second-class lever, describe the relationship between effort arm and the load (resistance) arm.

5. The wheels on a bicycle have a 10” radius. Assuming no sliding or slipping between the wheel and the road, how far will the bicycle travel for every one

full revolution of the wheels?

6. A ramp is used to raise an object 3’ from the ground. The lengths of the sides of the ramp are shown in the figure below. What is the mechanical advantage

of the ramp?

[pic]

7. What are the 6 simple machines?

8. a. Given the pulley configuration below, how many pounds of effort force would a user have to exert on the rope to lift the 60 lb. load?

[pic]

9.

a. What class of lever is shown in Figure 5? Justify your answer.

b. If a 50 lb effort is needed to balance a 260 lb load, how far from the fulcrum should the load be located? (answer precision = 0.0)

c. What is the IMA?

d. What is the AMA?

e. What is the efficiency?

Use the figure below to answer questions 10 – 12. The wrench used to turn the screw is 6 in long.

¼ 15 NC

13. Pulley Problems:

Solve for the unknown quantities in problems 1 through 5. Show all your work. List the equations used and units for your answers.

[pic]

[pic]

14. Gear Problems:

Solve for the unknown quantities in problems 1 through 5. Show all your work. List the equations used and units for your answers.

[pic][pic]

[pic]

15. Give a brief description of each of the following engineering fields.

Aerospace:

Agricultural:

Biomedical:

Chemical:

Civil:

Computer Hardware:

Electrical:

Electronics:

Environmental:

Health and Safety:

Industrial:

Marine and Ocean:

Materials:

Mechanical:

Mining and Geological:

Nuclear:

Petroleum

16. Sketch a series circuit.

17. Sketch a parallel circuit with 2 paths.

18. In a series circuit:

V =

RT =

I =

19. In a parallel circuit:

V =

[pic]

I1 =

IT=

20. Find the total resistance and current for the circuit below.

[pic]

21. Find the current through R1 (IR1), R2 (IR2), and R3 (IR3) for the following circuit:

[pic]

22. Describe how to use a multimeter to measure current, resistance and voltage.

23. Give 3 examples of nonrenewable energy sources.

24. Give 3 examples of renewable energy sources.

25. What is a Joule?

26. What is a Watt?

27. What is kilowatt-hours?

28. a) A mover pushes a 40 N box along the floor to a door 5 m away. Calculate the work done by the mover.

b) If the mover moved the box in 4 seconds, how many Watts of power are used to move the box?

29. What is the Conversion of Energy:

30. Name three examples of energy transformation.

31. Define the following methods of heat transfer and give an example of each:

a. convection –

b. conduction –

c. radiation –

32. What is the relationship of the U-value and the R-value?

33. What is the freezing temperature of water in Celsius, Fahrenheit and Kelvin?

34. How do you convert from Fahrenheit to Kelvin?

35. Define entropy.

36. Define temperature.

37. A 3 cm thick substance covers a 6 cm by 6 cm opening on a heat box. Determine the thermal conductivity for the insulating material if a 25 W bulb is

used to heat the box. The bulb maintains the inside temperature of 20 ̊C higher than the outside temperature.

38. If the light inside the heat box in problem 37 is left on for 10 minutes, determine the energy transfer.

39. A zoo keeper walks into the penguin exhibit to feed the penguins. The exhibit is kept at -10 ̊C. The zookeeper’s skin temperature is 35 ̊C. Determine the net energy transfer from the zookeeper’s skin during the 10 minutes it took her to feed the penguins. Note: Skin emissivity is .90, and the surface area of the zookeeper is 2 m2.

40. A 4 kg piece of tin at 70 ̊C is placed in 2 liters (2 kg) of water at 25 ̊C. Determine the final temperature (Tf). Note: Tin has a Specific Heat Capacity of 210 at 25 ̊C in J/kg ̊C. Water has a Specific Heat Capacity of 4184 at 25 ̊C in J/kg ̊C.

41. Calculate, label and dimension the[pic]and [pic]components. Indicate the location of the centroid using the appropriate symbol.

7 cm

1.8 cm

12 cm

3.4 cm

4.2 cm

42. Find the beam deflection of a board with a load of 500 lb, a Modulus of Elasticity of 600,000 psi, a Moment of Inertia of 5 in4 and a span of 8 ft.

43. Calculate the Moment of Inertia for the board whose cross section looks like figure A.

Figure A

2 in

6 in

44. Draw a free body diagram illustrating the x and y components of vector A. Solve for the component forces with a precision of 0.0.

[pic] 77 lb

70◦

45) Draw a free body diagram of joint A below be sure to include necessary labels, then solve for all unknown quantities:

RAx = __________________

RAy = __________________

ADx = __________________

ADy = __________________

AD = __________________

Circle one: compression tension

AB = __________________

Circle one: compression tension

-----------------------

10. What is the pitch of the screw?

11. What is the IMA of the screw?

12. If 10 lbs of force is used to turn the screw and it applies a

force of 500 lbs what is the efficiency of the screw?

3/4 in.

1/20 in.

1/2 in.

|Definitions: | | | |

|D in = Driver pulley diameter, in | |

|SR = Speed Ratio = Input Rate / Output Rate |

|D out = Driven pulley diameter, in | |

|w in = Driver pulley speed, rpm | |

|w out = Driven pulley speed, rpm | |

|T in = Torque of driver pulley, ft lbs. | |

|T out = Torque of driven pulley, ft lbs. | |

[pic]

|Prob # |D in |D out |SR |w in |w out |T in |T out |

|  |

|2 |6 |3 |? |200 |? |100 |? |

|  |

|3 |? |4 |? |100 |800 |20 |? |

|  |

|4 |? |8 |? |700 |150 |? |100 |

|  |

|5 |5 |? |? |? |150 |200 |800 |

|Definitions: | | | |

|N in = Number of teeth on Driver gear | |

|N out = Number of teeth on Driven gear | |

|D in = Driver gear diameter, in | |

|D out = Driven gear diameter, in | |

|GR = Gear ratio = Input Rate / Output Rate |

|w in = Driver gear speed, rpm | |

|w out = Driven gear speed, rpm | |

|T in = Torque of driver gear, ft lbs. | |

|T out = Torque of driven gear, ft lbs. | |

[pic]

|Prob # |N in |N out |D in |D out |GR |w in |w out |T in |T out |

|  |

|2 |12 |? |6 |? |3.17 |1800 |? |100 |? |

|  |

|3 |24 |12 |6 |? |? |1800 |? |100 |? |

|  |

|4 |24 |? |? |6 |3.17 |? |1800 |? |100 |

|  |

|5 |? |12 |? |6 |3 |? |1800 |? |100 |

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download