This set of Engineering Drawing Interview Questions and Answers for freshers focuses on “Terminology of Dimensioning – 2”.
1. Which of the lines is a thin continuous line with the ends terminating in arrowheads and is enclosed by extension lines, outlines or centre lines?
a) Dimension line
b) Leader line
c) Extension line
d) Section line
Explanation: The dimension line is a thin continuous line with the ends terminating in arrowheads and is enclosed by extension lines, outlines or centre lines. The dimension figures are written on the top of the dimension line or aligned at the centre of the dimension line according to the system of dimensioning.
2. What is the name of the thin continuous line which encloses the dimension lines are generally drawn 1mm away from the outlines?
a) Dimension line
b) Section line
c) Leader line
d) Extension line
Explanation: Extension line is a thin continuous line which encloses the dimension line and they are generally drawn 1mm away from the outlines. They need to draw near to the outlines and far away from the outlines.
3. In engineering drawing, which type of arrowhead is used?
a) Open (90˚)
b) Small open circle
c) Closed and filled
d) Oblique stroke
Explanation: Usually in engineering drawing, the arrowheads used are closed and neatly filled. They are made by hand in proportion to the thickness of the outline. The length of the arrowhead is three times the width of the arrowhead.
4. What is used to specify the operation done on a particular feature?
d) Leader line
Explanation: A note is used to indicate information about the operation done on a particular feature. It is written near to the feature and usually, it is shown outside the view. With this type of information of the drawing manufacturing of the part becomes easy.
5. Which of the following is a thin continuous line with one side terminating in arrowhead and the other with a period?
Explanation: A leader is thin continuous line with one end terminating in arrowhead and the other with a period. While dimensioning arcs or circles, leaders are aligned to the radius of the respective arcs or circles.
6. What is the inclination of the leader in a drawing?
c) Less than 30˚
d) Greater than 30˚
Explanation: The leaders are drawn at an inclination of more than 30˚. They should not be placed vertical, horizontal and less than 30˚ to the respective feature. The arrowhead should touch the feature they are describing or dimensioning.
7. A leader line can be drawn curved.
Explanation: A leader line can never be drawn curved. They should be drawn straight and inclined at an angle not less than 30˚. They should not be placed vertical or horizontal in the views. One side of the leader line should terminate in arrowhead and the other in a period.
8. Which of the following dimension needs to be calculated?
a) Length of the rectangle
b) Breadth of the rectangle
c) Diameter of circle
d) Position of circle
Explanation: In the given example, the diameter of the circle is not dimensioned. Diameter of a circle is a very prominent feature and should not be missed while dimensioning. The dimensions are so given that they do not require any further calculations. The above example is the incorrect way of dimensioning.
9. While dimensioning a feature with a square cross-section, what should be added before the dimension figure?
Explanation: While dimensioning a feature with a square cross-section, ‘SQ’ should be added before the dimension figure to indicate its shape. For dimensioning the base circle of a cylinder, the symbol ‘φ’ is added before the dimension figure.
10. While dimensioning a sphere, what should be added in front of the dimension figure?
Explanation: Since in all views, a sphere is seen as a circle. While dimensioning a sphere it is important to add ‘SPHERE’ in front of the dimension figure giving information about the diameter of the sphere. For example, a sphere with 25mm diameter will be dimensioned as ‘SPHERE 25’.
11. Operations performed on a particular feature are indicated by using extension lines.
Explanation: A note is used to indicate the operations done on a feature if there any. The note accompanied by a leader line which terminates in arrowhead on one side and a period on another side. For example, the threads on feature may have a note indicating whether it is a single start or double start.
12. Tapers and slope indicated in the view are part of dimensioning.
Explanation: Tapers and slopes are part of dimensioning. They are calculated through their respective formulas and are indicated as 1: x, near the feature which has the slope or taper on them. While drawing these features, having this information sure comes handy.
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