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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Plain scale constructed for ___
One dimension
Two dimensions
Three dimensions
None of the above
Two dimensions
A plain scale is a graphical representation used to measure distances in two units or dimensions (e.g., meters and decimeters). It is constructed by dividing a line of specific length into primary divisions to represent the larger unit and further subdividing the first primary division into secondary parts to represent the smaller unit.
A plain scale is a graphical representation used to measure distances in two units or dimensions (e.g., meters and decimeters). It is constructed by dividing a line of specific length into primary divisions to represent the larger unit and further subdividing the first primary division into secondary parts to represent the smaller unit.
RF=Actual LengthDrawing Length — Representative Fraction
L.O.S.=RF×M.L. — Length of Scale
The scale operates on the principle of linear proportional reduction, where a large physical distance is represented by a smaller distance on a drawing. By using one primary subdivision for major units and a subdivided section for decimal or fractional units, it enables the reading of two distinct dimensional values simultaneously.
Plain scales are generally used to measure up to two consecutive units.
The first division of the scale is subdivided into smaller parts to read the second dimension.
Commonly used in engineering drawing for simple linear measurements.
Used when accuracy requirement is not extremely high (unlike diagonal scales).
Simple to construct and draw.
Easy to interpret for basic linear measurements.
Cannot read three dimensions.
Accuracy is limited to two decimal places or two units.
Civil Engineering site plans.
General architectural drafting.
Basic map distance reading.
For measuring three dimensions (e.g., meters, decimeters, centimeters), a Diagonal Scale is used.
Plain scales can represent a unit and its immediate subdivision.
B is correct — Plain scales are specifically designed to represent two dimensions, such as a major unit and its primary subdivision.
Remember: Plain scales read two dimensions, diagonal scales read three, and vernier scales provide higher precision for linear measurements.