Engineering Design
Construction Technologies
Fluid Systems
Electrical Systems
Thermal Systems
100
What are the 8 steps of the engineering design process?
Identify the problem Research the problem Develop possible solutions Select the best possible solution Construct prototypes and/or models Test Communicate Redesign
100
When a stressed material recovers its original shape after the stress, it is called _____________ When a stressed material Keeps its new shape after the stress, it is called _____________
When a stressed material recovers its original shape after the stress, it is called ELASTICITY When a stressed material Keeps its new shape after the stress, it is called PLASTICITY
100
What type of system is a nail gun/compressor, an open or closed system? Why is this so?
A compressor/nail gun is an open system, b/c the fluids are not recirculated during operation
100
If the current is tripled, what happens to the resistance?
It is cut to one third
100
What does the r-value of a material tell us about that material?
It's resistance to heat flow
200
Describe the difference between model and prototypes. Also, describe when a model would be appropriate to use, versus a prototype being used
A model is a scaled version (either bigger or smaller) that is built to proportion. A prototype is a full working version that is full scale A model would be used to communicate something that is extremely large, or extremely small. A prototype is used to test out the actual product that was designed.
200
What is the difference between zoning laws and building codes?
zoning laws - where things can be built building codes - how things can be built
200
Which typically operate at higher pressures, pneumatic or hydraulic systems? What reason makes this system better than the other when working at higher pressures?
Hydraulics work at higher pressures Hydraulics work at higher pressures because liquids cannot be compressed. Additionally, higher pressures in hydraulics are possible due to the fact that external pressure on a liquid is transmitted uniformly throughout the fluids entire body.
200
What three physical modifications can be done in order to change the resistance of a circuit?
Change the: (A) length of conductor, (B) gauge or thickness of conductor, or (C) the temperature
200
Why should solar collectors face south in the winter? What can be used to block radiation entering the collectors in the summer?
Solar collectors (windows) should face south in the winter bc the sun is in a more southerly orientation in the winter, whereas the sun is more overhead in the summer To block radiation from entering the collectors, deciduous trees (w. leaves) and overhangs (soffits). Deciduous trees are preferred bc they allow radiation to enter in the winter, yet block the radiation in the summer.
300
What is meant by a line that looks like this: - - - - - - - - - - - What does this type of line mean in a drawing?
This is a hidden line A hidden line shows a line that cannot be seen in a particular view, but still needs to be communicated in that view
300
It is not advisable to seek shelter under a highway overpass during a tornado. When air moves through this narrow area, wind speeds increase and pressure decreases. This increases the risk for injuries.This phenomenon can be explained by which of the following?
Bernoulli’s principle
300
A fluid system has a 1:6 area ratio. If the input cylinder receives a force of 25 lbs, what is the output force?
150 lbs.
300
What value always remains the same in a parallel circuit?
Voltage
300
Describe the three ways for thermal energy to transfer.
Conduction- transfer through a solid Convection- transfer through fluids (liquids + gases) Radiation- transfer through electromagnetic waves
400
A scale drawing of a rectangular storage tank has a scale of 1cm = .5m The dimensions of the tank on the drawing are 24 cm x 32 cm x 20 cm. What are the dimensions of the actual storage tank?
12m x 16m x10m
400
There are 3 desks and 7 chairs in a room. Each chair weighs 5 lbs and each desk weighs lbs. What is the live load in the room?
110 lbs
400
Which bend would have the greatest resistance to fluid flow, a 45° bend, a 90° bend, or a 180° bend? Which of these bends would have the lowest pressure?
A 180° bend would have the greatest resistance A 45° bend would have the lowest pressure
400
What value changes in an AC supply? What value remains the same in an AC supply?
Voltage changes in AC, Current remains the same in AC
400
What are the terms used to describe when hot fluid rises and cooler fluid sink?
Convection current
500
A student has a drawing of the Federal Reserve Bank Building in Boston, Massachusetts. The building’s height in the drawing is 25 cm. The drawing has a scale of 1 cm = 7.5 m. What is the actual height of the building?
187.5 m
500
Explain tension, compression, shear, and torsion.
tension - pulling apart compression - pushing together shear - pushing in opposite directions torsion - twisting
500
What is the formula for force multipliers? What is the formula for distance multipliers?
FORCE Input area / Output area = Input force / Output force DISTANCE Output area / Input area = Input distance / Output distance
500
What is the purpose of a battery?
The purpose of a battery is to supply voltage, that doesn't change, in DC situations
500
How can a person keep the majority of their thermal energy within their house, and not allow the expensive thermal energy to become lost
Insulate walls and roof to the highest R value possible
M
e
n
u