10 TOP ENGINEERING DRAWING LAB VIVA Questions and Answers
1. Define engineering drawing. Why drawing is called universal language of engineers?
Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed.
So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc.
It is spoken, read, and written in its own way. Engineering drawing has its own grammar in terms of projections, conventional representations, types of lines, abbreviations, symbols and various geometric constructions.
2. Name different drawing instruments.
Drawing board, drawing sheet, mini-drafter, scale, pencil and sand paper block, cello-tape, eraser and compass.
3. What are the standard sizes of drawing sheets according to I.S.I. and which is suitable for drawing work?
The standard size of sheets according to I.S.I. are
A0 (1189 X 841),
A1 (841 X 594),
A2 (594 X 420),
A3 (420 X 297),
A4 (297 X 210) and
A5 (210 X 148).
Drawing sheet of size 594 X 420 i.e. A2 size is generally used by engineering students as it is very handy and easy for drawing work in class.
4. What are the ways of sharpening a pencil for good and accurate work and which type of pencil is more suitable for drawing work?
There are two ways of sharpening a pencil a small piece of sand paper of zero grade, pasted upon a piece of wood.
5. Why cello-tape is used instead of drawing pins, nowadays?
Nowadays, cello tapes are used in place of drawing pins for its practical convenience as the drafter, can be moved easily over the tape and the drawing board is spoiled by the use of drawing pins.
6. What is layout of drawing sheet?
(i) Leave the following margins
1cm on top
1cm on bottom
1cm on right
3cm on left
(i) Make a title block(rectangle) of size 65 mm high and 185 mm width on the right bottom side for title block, parts list
7. Why is the layout of sheet is necessary?
Layout of the drawing on the drawing sheet is necessary in order to make its reading easy and fast. The title blocks, parts list etc will provide all the required information.
8. List out the contents of title block.
The title block should contain the following information.
(i) Name of the institution
(ii) Title of drawing
(iii) Name, Branch, section and Roll no. of the student
(iv) Type of scale used
(v) Drawing number
(vi) Type of symbol for the method of projection
9. What do you mean by convention/ code?
The representation of any matter by some standard sign or symbol on the drawing is known as convention or code. The conventions make the drawing simple and easy to draw.
10. What do you understand by thickness of lines?
There are three distinct thickness of lines used in engineering drawing. These lines are specified as thick, medium and thin lines. The line specified as thick is usually 3 times thicker and the line specified as medium is 2 times thicker than a thin line.