This set of Engineering Drawing Questions and Answers for Entrance exams focuses on “Types of Scales – 3”.
1. Why it is more beneficial to represent the scale graphically other than by just numerical?
a) To represent clearly
b) More accurate
c) To measure directly from scale
d) To prevent
View Answer
Explanation: The scale is drawn on the drawing itself. As the drawing becomes old, the drawing sheet may shrink and may not give accurate results then. But if we use a graphical scale, along with drawing the scale also shrinks.
2. What is not essential information to construct a scale from the following?
a) The R.F. of the scale
b) The units to represent
c) Length of scale
d) Maximum length
View Answer
Explanation: The length of the scale can be found using ’length of the scale = Representative fraction x Maximum length’. To draw drawing R.F (representative fraction), Units to represent (example: meters and centimeter or another if needed) and maximum length required is essential.
3. Scales having same representative fraction but graduated to read different units are called ______________________
a) Scale of chords
b) Circular vernier scale
c) Comparative scale
d) Diagonal scale
View Answer
Explanation: A drawing drawn with a scale reading inch units can be read in metric units by means of a metric comparative scale, constructed with a same representative fraction. The comparative scales may be plain scales or diagonal scales and may be constructed separately or one above the other.
4. The scale used in micrometer is _____________
a) Plain scale
b) Comparative scale
c) Diagonal scale
d) Circular vernier scale
View Answer
Explanation: The circular vernier uses the principle of the vernier. The circular vernier is used in surveying instruments to measure angle to the required accuracy. In the case of mechanical engineering, it is used in measuring instruments like a micrometer.
5. The scale used to find angles is ________
a) Diagonal scale
b) Comparative scale
c) Circular vernier scale
d) Scale of chords
View Answer
Explanation: The scale of chords is used to set out or measure angles when a protractor is not available. It is based on lengths of chords of different angles measured on the same arc.
6. Which scale you prefer if there is a need to measure most accurately.
a) Plain scale
b) Vernier scale
c) Ordinary scale
d) Comparative scale
View Answer
Explanation: The plain scale gives only up to a single decimal. Comparative scales are just used to represent two different units. The vernier scale gives up to 2 decimal values.
7. Which scale represents only two units or a unit and its sub-division?
a) Diagonal scale
b) Plane scale
c) Scale of chords
d) Vernier scale
View Answer
Explanation: A plain scale is constructed by dividing a line into the suitable number of equal parts or units, the first of which is sub-divided into smaller parts. Plain scales represent either two units or a unit and its sub-division.
8. Which scale is employed when we need to measure in three units?
a) Plane scale
b) Scale of chords
c) Vernier Scale
d) Diagonal scale
View Answer
Explanation: A diagonal scale is used when very small distances are to be accurately measured or when measurements are required in three units. Small divisions of short lines are obtained by the principle of diagonal scales.
9. We need a scale which has to show dm, cm and mm. Which scale do you prefer?
a) Diagonal scale
b) Plain scale
c) Vernier scale
d) Comparative scale
View Answer
Explanation: Diagonal scale is meant for drawing scales which represents 3 units. A diagonal scale is used when very minute distances to be measured. Small divisions of short lines are obtained by the principle of the diagonal scale.
10. Which scale is used in surveying instrument?
a) Comparative scale
b) Circular Vernier scale
c) Vernier scale
d) Scale of chords
View Answer
Explanation: The circular vernier uses the principle of the vernier. The circular vernier is used in surveying instruments to measure the angle to the required accuracy. In the case of mechanical engineering, it is used in measuring instruments like a micrometer.
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