1. The rule followed by the leader line is ____________
a) All notes are written in horizontal direction
b) Leader line should cross with other dimension lines
c) Leader line should be very long
d) Leader line is drawn at an angle less than 30 degrees from horizontal
Explanation: The rules followed by the leader lines are: All notes are written in horizontal direction. Leader line should not cross with other dimension lines. Leader line should not be very long. Leader line is drawn at an angle 45 & 60 degree but not less than 30 degrees from horizontal. Leader line should be radial to an arc or circle pointing towards its center
2. Dimension line is drawn slightly away from the object, about ______
a) 4 to 6 mm
b) 2 to 4 mm
c) 6 to 8 mm
d) 8 to 10 mm
Explanation: Dimension line is drawn slightly away from the object, about 8 to 10 mm. Distance between the object and dimension line should not be less than 8 mm and not be greater than 10 mm. Dimension line near the object is not suited for the best appearance as well as for too far from the object.
3. The line which is drawn under the two extension lines, ending with an arrow is called _____
a) leader line
b) dimension line
c) extension line
d) polyline
Explanation: The line which is drawn under the two extension line, ending either with an arrow is called dimension line. The dimension line is also ending with oblique stroke or solid dot. The dimensional line is a thin continuous line broken in middle for give there dimensional values or the line may be continuous and dimensional values are written above it.
4. The dimensional line should be _______ to the object.
a) vertical
b) horizontal
c) parallel
d) perpendicular
Explanation: The dimensional line should be parallel to the object. Because the dimensional line should not be vertical or horizontal to the object from that point of view proper dimension are not given to the object. It may be given as per the nature of the object. For the best view, the dimension should be parallel to the object
5. Preferably a dimension should be placed ______ the view.
a) inside
b) outside
c) left side
d) right side
Explanation: Preferably a dimension should be placed outside the view. The dimension line should be placed outside the view because if it is placed inside the object it becomes too confusing for understanding the dimension of the object. Also, it does not coincide with center line
6. When space is less, the dimensional value may be put outside or adjacent to it
a) True
b) False
Explanation: Putting dimensions value outside or adjacent to line is one of the methods to be used for dimensioning where sufficent space is not available. In this method the arrowheads will turn outside to inside. Here, the direction of arrowhead also changes.
7. Important point on which the arrowhead is to be drawn is _______
a) They are drawn graphically by using scale
b) Height of arrow is kept about one third of the length of arrow
c) They should be non symmetrical about the dimension line
d) Pointed end of arrow should not touch the extension line
Explanation:For better appearance and the limit of arrowhead height of arrow is one third of the length of arrow. Arrowhead is drawn freehand. Length of the arrow is same as the height of the dimensional values. The arrowhead should be symmetrical with a dimension line.
8. _______ are the numbers that are written on the dimension line to specify the size of the object drawn in SI or FPS units.
a) Scales
b) Prime numbers
c) Even numbers
d) Dimensional Values
Explanation: The numbers which are written above the dimension line to specify their size is called dimensional values. For mechanical engineering, the unit will be in mm, for civil engineering the unit in meters. It is important to indicate the unit in title for understanding
9. The dimensional values should be of ______ size
a) potential
b) approximate
c) actual
d) preferable
Explanation: The dimension values should be of actual size. It is because the worker does not make the calculation about the drawing. So it is not multiplied by the factor with dimensional values. Scale should be indicated for the scaled drawing in the title box.
10. For mechanical drawings, the unit is meters while for civil engineering drawings it can be mm.
a) True
b) False
Explanation: For mechanical drawings, the unit is mm. For civil engineering drawings it can be meters. Hence it is important to indicate the unit in the title box, ‘All dimensions are in mm/m’ and the unit is not indicating with the numbers, i.e. 40 meaning 40 mm.