This set of Basic Engineering Drawing Questions and Answers focuses on “System of Dimensioning – 2”.
Explanation: In aligned system of dimensioning, the dimensions are written on the dimension line. Their alignment is along the length of the dimension line. The dimensions are always written either on top or below the dimension line but never cutting it.
2. In dimensioning, the lines enclosing the dimension line are known as ____
a) Leader line
b) Dimension line
c) Extension line
Explanation: The extension line encloses the dimension line. It starts and ends with the line to be dimensioned. The extension line is extended beyond the dimension line by 4mm. It helps in defining proper boundaries for the dimension line.
3. When dimensioning the circle, the dimension line begins from the center of the circle.
Explanation: When dimensioning the circle, the dimension line begins from the centre of the circle. With the help of the leader line, the dimensions are written on it. The notations φ and R are used to indicate whether the dimension denotes diameter or the radius respectively.
4. While dimensioning a circle, the leader line and the dimension line are drawn at which angle with respect to each other?
c) 0˚ or 180˚
Explanation: When dimensioning a circle, the leader line and the dimension line are drawn 0˚ or 180˚ with respect to each other. This helps in clear dimensioning of the circle. It also reduces the difficulty in reading the dimensions when there are concentric circles involved.
5. While dimensioning holes, slots, etc. how would their number be specified?
a) Number written on the dimension line
b) Number is written of the leader line
c) Number is written on the corner of page
d) Number is written on the side of the hole or slot
Explanation: The number of holes, slots, etc. is written on the dimension line along with the dimensions. For example, if there are four holes of the same dimensions; then only one of the holes will have their dimensions specified and along with dimensions, the number is also written; 4Holes, φx mm.
6. What is the height if the dimension figures written on the dimension line?
a) 7mm to 9mm
b) 2mm to 3mm
c) 6mm to 8mm
d) 3mm to 5mm
Explanation: It is customary to write the figures with a height of 3mm to 5mm. This helps in the readability of the dimension figures. It also makes reading the dimensions easy. The thickness of the letters is so adjusted that it can read without effort.
7. While dimensioning, what should always be written before a point accompanied by a figure if the value of the figure is less than unity?
Explanation: For figures having a value less than one, dimensions should be written as 0.5 or 0.3 as per the value. There needs to be a zero in front of the point if it is less than 1. Sometimes zero is omitted but this practice should not be encouraged.
8. In unidirectional system, the figures are written along the dimension line.
Explanation: In unidirectional system of dimensioning, the dimension figures are written in between the dimension line. All dimensions are aligned according to the observer i.e. all are written in the horizontal direction and not along the length of the dimension line.
9. In which system of dimensioning the figures can read from the bottom only?
a) Aligned system
b) Unidirectional system
c) Nonaligned multidirectional system
d) Parallel system
Explanation: In unidirectional system of dimensioning, the dimension figures are so written that they can be read only when viewed from the bottom and not from any other direction. Reading the dimensions is easier than in aligned system.
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