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CM 4206 Exam 2 questions with complete solutions
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CM 4206 Exam 2 questions with complete solutions
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CM 4206 Exam 2Which of the following correctly describes the power source for each 3D printing category? - correct
answer ✔✔Power bed fusion
The main sources of layer deformations during concrete 3D printing are - correct answer ✔✔Self-weight,
extrusion pressure, and weight of the following layers
Which of the following can result in a lower mechanical strength of 3D printed concrete, vs cast-in-place
concrete with the same water-to-cementitious ratio? - correct answer ✔✔Excessive water evaporation
Which of the followings is correct about Contour Crafting and Fused deposition modeling (FDM) 3D
printing technologies? - correct answer ✔✔FDM is a thermal based process, while Contour Crafting uses
cementitious materials which involve chemical reactions
The main advantages of Contour Crafting (compared to conventional concrete construction) are resulted
from the fact that - correct answer ✔✔This technology eliminates the need for formwork
Which of the followings cannot be considered as an implementation barrier for construction-scale 3D
printing (Contour Crafting)? - correct answer ✔✔Technical challenging (low construction speed)
Which of the following material types is the most viable for Lunar and Martian construction using
construction-scale 3D printing? - correct answer ✔✔In-situ materials such as lunar regolith or sulfur-
based concrete
What are the main performance requirements of printable concrete? - correct answer ✔✔Extrudability
and shape stability
In concrete 3D printing, interlayer adhesion (bonding) can be negatively influenced by a prolonged
interlayer time gap - correct answer ✔✔True
, Contour crafting can be classified as a power bed fusion 3D printing technology - correct answer
✔✔False
Fused deposition modeling is a 3D printing technology based on material extrusion, and uses thermal
energy - correct answer ✔✔True
Construction 3D printing is an automated construction technology based on specially-designed
cementitious mixtures and can only be used for on-site construction - correct answer ✔✔False
The software workflow in construction 3D printing includes - correct answer ✔✔CAD models > 2D layers
> Toolpath planning > Sending G-code file to the robot
The positioning accuracy of gantry robots is typically lower than robotic arms (articulated robots) -
correct answer ✔✔False
Why "rebar reinforcement" is not considered as an acceptable reinforcement technique in construction
3D printing - correct answer ✔✔It is very difficult to automate rebar installation, and manual rebar
reinforcement is not compatible with an automated construction process
What is the most common concrete pump type used in construction 3D printing - correct answer
✔✔Progressive cavity pump
Delta 3D printers consists of three arms on rails that move up and won independently to move the
printhead - correct answer ✔✔True
What are the typical main subsystems of a construction 3D printing system? - correct answer ✔✔3D
printing robot, material preparation, material delivery, control system
For a one-story building CAD model, all the 2D layers which are generated after the 3D model slicing, are
the same - correct answer ✔✔False
What are the main functions of an ideal software system for construction 3D printing? - correct answer
✔✔Controlling, coordinating, and monitoring the subsystems
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