AUTOMOTIVE DRAWING SECTION 1
SECTION 1
1. What do
you understand by, (a) scale = 5:1 and (b) scale = 1:10?
A. The scale 5:1, it shows Enlarged scale. It means
the object have been drawn 5 time bigger than its actual size/dimension.
The scale 1: 10, it shows reduced scale. It means the
object which have been drawn is 10 time smaller than its actual size/dimension.
2.
While finishing a
drawing, what is
the order of
priority in the
following coinciding lines: (a) centre lines (b) visible lines (c)
hidden lines.
A. (b) visible lines
(c) Hidden
lines
(a) Centre
lines
3. Name the
features which should not be shown hatched.
A. Latitude, when they are sectioned longitudinally.
4. What is
the angle at
which hatching lines
are drawn to
the axis or
to the main outline of the
section?
A. preferably 45°
5. Sketch
the following types of lines:
(a) center line
(b) Cutting
plane line.
(c) Hidden
line
6. Define
the term “Production drawing”.
A. A production
drawing is legal document of company. It is used by the technicians on the
shop-floor for manufacturing the parts. It must provide information about part
number, dimension, tolerance, surface finish, material and stock size,
manufacturing process, special finishing process if required, and no. of
required for each assembly.
7. What is
meant by a detailed assembly drawing?
A. It is usually made for simple machines, comprising
of a relatively smaller number of simple parts. All the dimensions and
information necessary for the construction of such parts and for the assembly
of the parts are given directly on the assembly drawing. Separate views of
specific parts in enlargements, showing the fitting of parts together, may also
be drawn in addition to the regular assembly drawing.
8. What is a
sub-assembly drawing?
A. A sub-assembly drawing is an assembly drawing of a
group of related parts, that form a part in a more complicated machine.
Examples of such drawings are: lathe tail-stock, diesel engine fuel pump,
carburettor, etc.
9. State
unit of surface roughness.
A. Micrometre (µm)
10. Draw symbol of surface roughness when material
removal is not permitted.
A.
11. What is welding and what type of fastening is
it?
A. Welding is an effective method of making permanent
joints between two or more metal parts.
Type of fastening
Bolt
Clasps
Screw, Nut, Rivet, cable, etc.
12. Write down types of welding process.
A. 
13. What is
limit?
A. The two extreme permissible sizes between which the
actual size is contained are called limits. The maximum size is called the
upper limit and the minimum size is called the lower limit.
14. Explain
the following terms:
Tolerance - The permissible variation of a size is
called tolerance. It is the difference between the maximum and minimum
permissible limits of the given size.
Limits- The two extreme permissible
sizes between which the actual size is contained are called limits. The maximum
size is called the upper limit and the minimum size is called the lower limit.
Deviation- It is the algebraic
difference between a size (actual, maximum, etc.) and the corresponding basic
size.
Basic Size-
It is determined solely from design calculations. If the strength and stiffness
requirements need a 50mm diameter shaft, then 50mm is the basic shaft size. If
it has to fit into a hole, then 50 mm is the basic size of the hole.
Design Size-
It is that size, from which the limits of size are derived by the application
of tolerances. If there is no allowance, the design size is the same as the
basic size. If an allowance of 0.05 mm for clearance is applied, say to a shaft
of 50 mm diameter, then its design size is (50 – 0.05) = 49.95 mm. A tolerance
is then applied to this dimension.
Geometrical Tolerance- The permissible variation
of geometrical form are known as geometrical tolerance.
Dimensional Tolerance- The permissible variation
of size dimensions are known as dimensional tolerance.
15. What is
maximum material condition?
A. maximum material condition (MMC)
refers to a feature-of-size that contains the greatest amount of material, yet
remains within its tolerance zone. Some
examples of MMC include:
Largest pin
diameter
Smallest hole
size
16. What is
unilateral and bilateral tolerance?
A. If the variation is provided on one side of the
basic size, it is termed as unilateral tolerance. Similarly, if the variation
is provided on both sides of the basic size, it is known as bilateral tolerance.
17. What is
fundamental tolerance and how tolerance is denoted?
A. the basic sizes from l mm to 500 mm have been
sub-divided into 13 steps or ranges. For each nominal step, there are 18 grades
of tolerances, designated as IT 01, IT 0 to IT 1 to IT 16, known as
“Fundamental tolerances”. The fundamental tolerance is a function of the
nominal size and its unit is given by the empirical relation.
A. The hole basis system and shaft basis system.
19.With help
of sketches and
example show the
following: (1 mark
for each) (a) Flatness tolerance (b) Circularity tolerance (c)
Angularity tolerance (d) Parallelism tolerance (e) Perpendicularity tolerance
(f) Symmetry tolerance (g) Straightness tolerance
A.
20. Why
washer is used in Bolt-Nut pair?
A. It is used to give a perfect seating for the nut
and to distribute the tightening force uniformly to the parts under the joint.
It also prevents the nut from damaging the metal surface under the joint.
21. Draw the
sketch of wing nut.
A. 
22. What is
stud?
A. The stud is first screwed into one of the two parts
to be joined, usually the thicker one.
23. What is
the use of split pin?
A. It is use for preventing nut from turning. It is
also used in conjunction with special nuts designed for the purpose.
24. What is
a fastener and what is meant by fastening?
A. A machine element used for holding or joining two
or more parts of a machine or structure is known as a fastener. The process of
joining the parts is called fastening.
25. Define the
following terms with respect to screw threads:
(a) pitch- It is the distance
measured parallel to the axis, between corresponding points on adjacent screw
threads.
(b) Pitch
diameter- This is the diameter of an imaginary cylinder,
passing through the threads at the points where the thread width is equal to
the space between the threads.
(c) Major diameter- This is the
largest diameter of a screw thread, touching the crests on an external thread
or the roots of an internal thread.
(d) Minor diameter- This is the
smallest diameter of a screw thread, touching the roots or core of an external
thread (root or core diameter) or the crests of an internal thread.
(e) lead- It is the distance a
screw advances axially in one turn.
(f) crest- It is the peak edge of
a screw thread, which connects the adjacent flanks at the top.
(g) root-
It is the bottom edge of the thread that connects the adjacent flanks at the
bottom.
(h) Thread angle-
This is the angle included between the flanks of the thread, measured in an
axial plane.
26. Why are
washers used in bolted joints?
A. Refer Question No. 20
27. What
purpose is an eye-bolt used?
A. It can be conveniently held to prevent rotation.
28. What is
a set screw?
A. These are used to prevent relative motion between
two rotating parts, such as the movement of pulley on shaft. For this, a set screw
is screwed into the pulley hub so that its end-point bears firmly against the
shaft. The fastening action is by friction between the screw and the shaft.
29. Explain
Ф30 h7 tolerance with indications.
A. It means a Ф 30 H-hole with IT7.
Thanks for sharing this information. Keep on posting.
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