Mech131 (Drafting) Midterm Prep

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| Written by Jamiemaloway2

Jamiemaloway2

Community Contributor

Total Contribution - 1 | Total attempts - 55

Questions: 12 | Attempts: 55 | Updated: Mar 17, 2023

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Questions and Answers

1.

The orthographic drawing form as also known as ________________.

Explanation
The orthographic drawing form is commonly referred to as "third-angle projection". This term is used to describe the method of representing a three-dimensional object on a two-dimensional plane by projecting its views onto different planes. The term "third angle projection" is also used interchangeably with "third-angle projection" and "3rd-angle projection". All of these terms refer to the same concept of representing objects in technical drawings.

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2.

North America uses first-angle projection in mechanical drawings.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
North America does not exclusively use first-angle projection in mechanical drawings. In fact, North America predominantly uses third-angle projection. First-angle projection is commonly used in Europe and other parts of the world. Therefore, the statement that North America uses first-angle projection in mechanical drawings is false.

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3.

Centre lines should go slightly beyond the boundary of the object.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Centre lines should go slightly beyond the boundary of the object to indicate the symmetry and alignment accurately. By extending the centre lines slightly beyond the object, it allows for a clearer representation of the object's center and helps in determining its proportions and positioning. This ensures that the object is accurately depicted and provides a visual reference for further measurements or design considerations.

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4.

The centre lines of two adjacent circles can touch.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because the center lines of two adjacent circles can indeed touch. When two circles are adjacent, it means they are touching each other externally at a single point. The point of contact is the intersection of the center lines of the circles. Therefore, the statement is correct.

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5.

In which drawing type will the object appear to be distorted because all features are drawn 1:1?
- A.
  
  Cabinet Oblique
- B.
  
  Cavalier Oblique
- C.
  
  Isometric
Correct Answer
B. Cavalier Oblique

Explanation
In a Cavalier Oblique drawing, the object will appear distorted because all features are drawn 1:1. This means that the length, width, and height of the object are all drawn in their true proportions. However, in a Cavalier Oblique drawing, the height of the object is not reduced or foreshortened, resulting in a distorted appearance.

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6.

In an isometric drawing, three axes are drawn at an angle of _____ degrees to each other.

Correct Answer
120

Explanation
In an isometric drawing, three axes are drawn at an angle of 120 degrees to each other. This means that each axis is inclined at 120 degrees to the other two axes, creating a three-dimensional representation that accurately portrays the object's proportions. Isometric drawings are commonly used in engineering and technical fields to provide a clear and realistic view of objects.

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7.

What type of line is shown below?

Correct Answer
Centre
Center
Center Line
Centre Line

Explanation
The given answer options suggest that the line shown below can be referred to as "Centre," "Center," "Center Line," or "Centre Line." These terms may vary based on regional spelling preferences.

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8.

What type of line is shown below?

Correct Answer
Hidden
Hidden Line

Explanation
The line shown below is a hidden line. A hidden line is a type of line used in technical drawings to represent edges or surfaces that are not visible in the current view. It is typically represented by a dashed or dotted line. In this case, the line is specifically referred to as a hidden line.

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9.

What type of line is shown below?

Correct Answer
Object
Object Line

Explanation
The line shown below is an object line.

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10.

The arrows from a cutting plane indicate the direction of view.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because in technical drawings, the arrows on a cutting plane indicate the direction from which the object is being viewed. This helps to provide a clear understanding of the object's shape and structure. By following the arrows, one can determine the perspective and orientation of the object being depicted.

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11.

The cutting plane line may be omitted if it corresponds with a centre line
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is stating that the cutting plane line can be omitted if it aligns with a center line. This means that if the cutting plane line coincides with a center line, there is no need to draw a separate line for the cutting plane. This is true because center lines are used to represent symmetry or the center of an object, and if the cutting plane line aligns with it, it already serves the purpose of indicating the cutting plane. Therefore, there is no need to duplicate the line.

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Mech131 (Drafting) Midterm Prep

The orthographic drawing form as also known as ________________.

North America uses first-angle projection in mechanical drawings.

Centre lines should go slightly beyond the boundary of the object.

The centre lines of two adjacent circles can touch.

In which drawing type will the object appear to be distorted because all features are drawn 1:1?

In an isometric drawing, three axes are drawn at an angle of _____ degrees to each other.

What type of line is shown below?

What type of line is shown below?

What type of line is shown below?

The arrows from a cutting plane indicate the direction of view.

The cutting plane line may be omitted if it corresponds with a centre line