Engineering Drawing – Scales – Quiz 1
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Engineering Drawing – Plane Scales – Quiz 1
1. The maximum length is 50 m and length of scale is 10 cm. Find the Representative factor.
a) 1/50
b) 50
c) 500
d) 1/500
Answer: d
Explanation: Length of scale = RF × Max length = RF × 5000 cm → 10 cm = RF × 5000 ⇒ RF = 1/500
2. Given RF as 4/50 and maximum length is 100 cm. Find the length of scale.
a) 8 cm
b) 10 cm
c) 9.7 cm
d) 12 cm
Answer: a
Explanation: Length of scale = RF × Maximum length = (4/50) × 100 = 8 cm
3. Arrange the steps to construct a scale of 1:50 to show meters and decimeters and the maximum length is 5 meters:
- i. Then divide the 1st part into 10 equal divisions
- ii. Determining the length of scale 1/50 × 500 cm = 10 cm
- iii. Determining R.F. here it is 1/50
- iv. Draw a line 10 cm long and divide it to 5 equal parts
Options:
a) i, ii, iii, iv
b) iii, ii, iv, i
c) ii, iv, i, iii
d) iv, i, ii, iii
Answer: b
Explanation: Start by finding RF, then scale length, draw the scale, divide units, and subdivide.
4. Which of the following scales is used when there are three units that need to be measured?
a) Plain scale
b) Comparative scale
c) Diagonal scale
d) Vernier scale
Answer: c
Explanation: Diagonal scales allow accurate reading of three units (e.g., m, dm, cm).
5. What is the length of the scale, the representative fraction is 1:50000 and the scale must measure up to 25 km?
a) 5 × 10⁻⁴ cm
b) 50 cm
c) 5 cm
d) 0.5 cm
Answer: b
Explanation: (1/50000) × 25 × 1000 × 100 = 50 cm.
6. 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
Answer: b
Explanation: Plane scales represent either two units or one unit and its sub-division.
7. 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
Answer: a
Explanation: Diagonal scales are ideal for showing three different units precisely.
8. The ratio of the length of the drawing of the object to the actual length of the object is called ___________
a) Resulting fraction
b) Representative figure
c) Representative fraction
d) Representative index
Answer: c
Explanation: R.F = Length on drawing / Actual length.
9. When drawings are drawn smaller than the actual size of the objects the scale used is said to be _________
a) Enlarging scale
b) Reducing scale
c) Small scale
d) Decreasing scale
Answer: b
Explanation: Used when drawing is smaller than actual object size.
10. Length of scale (LOS) = ______ × ______
a) Max. Length and R.F
b) R.F and Min. length
c) R.I and Max. Length
d) E.I and Max. Length
Answer: a
Explanation: Length of scale = R.F × Maximum measurable length.
