# Engineering Drawing Questions and Answers – Diagonal Scales – 1

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This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Drawing Tools and their Uses – 1”.

1. The diagonal scales are used when measurements are required in _____ units.
a) 1
b) 2
c) 3
d) 4

Explanation: Using plain scale we can accommodate 2 units (example: yard, feet). But with the diagonal scale we can accommodate 3 units (example: yard, feet and inch). It is possible by the principle of diagonal division.

2. If a diagonal scale is to be made with a meter, decimeter and centimeter then, how many divisions it has to be made vertically?
a) 3
b) 5
c) 10
d) 9

Explanation: Vertical divisions are related to how many centimeters take a decimeter. It is 10. Or anywhere in a diagonal scales vertical division are dependent of 2nd and 3rd unit which we use in drawing diagonal scale.

3. If a diagonal scale is to be made with a yard, feet and inch then, how many divisions it has to be made vertically?
a) 3
b) 12
c) 10
d) 6

Explanation: Vertical divisions are related to how many inches take a foot. It is 12. Or anywhere in the diagonal scales vertical division are dependent of 2nd and 3rd unit which we use in drawing diagonal scale.
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4. Arrange the steps involved in drawing the diagonal scale.
i) Dividing vertically and joining the points from subdivisions to successive next subdivisions on the last vertical line.
ii) Finding length of scale
iii) Finding R.F.
iv) Dividing horizontally and subdividing the 1st part.
a) i, ii, iii, iv
b) iii, ii, iv, i
c) iv, iii, i, ii
d) ii, i, iv, iii

Explanation: General procedure in preparing graphical scales includes finding representative fraction at first and then finding length of scale. Next dividing horizontally, sub-dividing the 1st division which is common in plain and diagonal scale. In diagonal scales the fourth step as said above places prominent role.

5. A plot of 35,000 sq m is drawn on map as plot of 14 cm and 5 cm. Find the R.F.
a) 1/35000
b) 1/50000
c) 1/34930
d) 1/2236

Explanation: Area of plot in drawing is 14 x 5 = 70 sq cm (equivalent to 35000 sq m). So 1 sq cm =35000/70 = 500 sq m. 1 cm = square root of 500 m = 22.3 m (equivalent to 1 cm). Representative fraction = 1/ (22.36 m) =1/ (2236 cm).

6. Diagonal scale follows the principle of similar triangles.
a) True
b) False

Explanation: Diagonal scale follows the principle of similar triangles where a short length is divided into a number of divisions in which sides are proportional which produces interpolated values in between the 1st least number in a unit to 0.

7. We can draw diagonal scale for meter, feet, inch.
a) True
b) False

Explanation: There exists a particular order in selecting 1st, 2nd and 3rd unit while drawing diagonal scale that is 1st should have a higher quantity of all three, 3rd should have least quantity of all three and 2nd should be middle in them. And there exits at least appreciable multiples among themselves.

8. Which of the following scales is used to accurately measure minute divisions?
a) Plain scale
b) Diagonal scale
c) Scale of chords
d) Comparative scale

Explanation: Minute divisions are accurately measured by using diagonal scales. Diagonal scales are also when three different units of measurements are needed to be measured. With the help of these scales, we can get a relation between three different units.

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