BIS
Q: Why do we require standards?
Q: What is the importance of the standard?
Q: Describe a brief history of BIS.
Q: Describe important functions/activities of BIS?
Q: Describe the role of BIS in the development of the nation.
Q: Why do we require product certification?
Q: What is mandatory certification ? Describe different schemes?
Q: What is a hallmarking scheme?
Lab Activity
Q: List different components observed during SA Lab visit?
Q: Describe different assemblies observed during SA Lab visit?
Q: Explain different drives used for power transmission observed during SA Lab visit?
Q: Describe different Engineering characteristics on MIG engine such as surface finish,
locking arrangements, possible sequence of assembly, materials etc.
Introduction to Machine and Production Drawing
Q. Differentiate between: Machine drawing and Production drawing, and ii) Tolerance and
Allowance
Limits, Fits and Tolerances
Q: Describe the requirements of mass manufacturing/production?
Q: Why do require mass production to be cost competitive?
Q: What is the role of Engineering drawing as part of the Product Lifecycle Management
(PLM)?
Q: What is interchangeability? Describe two important conditions for interchangeability?
Q: Differentiate between Accuracy and Precision.
Q: Define following terms 1) Basic Size, 2) Design Size, 3) Limit Sizes, 4) Tolerance, 5)
Allowance, 6) Fits, 7)
Q: How is the basic size of a component determined?
Q: How design size is determined? Why is the design size different from the basic size?
Q: Why clearance or interference is required between mating components?
Q: What are the different factors/objectives for product design?
Q: Why exact sizes of components are not possible?
Q: What is deviation?
Q: What is the true size of a component?
Q. A fit H7 / g6 is specified for an assembly of housing and shaft of 100 mm nominal diameter.
Determine
i) The dimension of hole in housing
ii) The dimension of shaft
iii) Maximum and minimum, interference or clearance
iv) Type of fit obtained with the help of self explanatory sketch
Tolerance unit in µm, (Note, D in mm) & (d1 d2)
Fundamental deviation for shaft designation, e = -2.5 D0.34 µm
Refer tables for fundamental deviation of shaft and hole and tables for Grades of
tolerances.
Q. A mating shaft providing a minimum clearance of 0.15 mm with hole in another
component. Basic size of shaft and hole is 80 mm. Determine the limit dimensions for a
clearance fit between shaft and hole using hole basis system and shaft basis system. The
tolerance is equal to 0.03 mm and 0.05 mm on the hole and shaft respectively.
Q. Describe variations formed within clearance and interference fit to suit functional
requirement of mating parts along with suitable examples of applications.
Dimensioning Techniques
Q1. Write any eight different general rules referred for dimensioning in technical drawing.
Write difference between machine drawing and production drawing.
OR
Q1. Explain the concept of tolerance accumulation depend on type of dimensioning method.
Suggest suitable method of dimensioning.
Conventional representation
Q. Describe guidelines for the conventional representation of different types of springs.
Q. Describe any two locking arrangements for threaded parts.
Q. Sketch the conventional representation of a) internal threads, b) external treads, c) Assembled
threads parts
Q. Describe types of gears and their conventional representation.
1. Introduction to Machine and Production Drawing
What is the significance of section views in machine drawings?
How do production drawings differ from general machine drawings? Provide examples of each.
What is standardization in the context of machine and production drawings?
Why is standardization important for manufacturing and assembly? Provide an example.
What are the key elements of a production drawing?
Describe the importance of tolerance specifications in production drawings.
How do production drawings assist in the quality control process of manufacturing?
What is the difference between an assembly drawing and a part drawing?
Why is it important to include parts lists and part numbers in assembly drawings?
What is a Bill of Materials (BOM), and what role does it play in production?
What are 'limits and fits' in mechanical design, and why are they important in ensuring proper
functionality of assembled parts?
Why is it essential to consider standardization when designing mechanical components?
02 Part I: Limits, Fits and Tolerances
Explain the difference between clearance fit, interference fit, and transition fit. Provide examples of
where each type is used.
What are the different types of fits commonly used in mechanical design, and what are their
applications?
How do limits and fits impact the manufacturing process and product performance?
What role does a production drawing play in the communication between design engineers and
manufacturing teams?
What is the difference between 'limits' and 'tolerances' in mechanical engineering design?
Define 'fit' and describe its importance in the assembly process of mechanical parts.
What is the difference between the hole-base system and the shaft-base system of tolerance?
What is the significance of the "H" and "h" symbols in tolerance specifications? Provide examples.
When selecting tolerances for a component, under what circumstances would you choose the
hole-base system over the shaft-base system, and why?
Explain the process of selecting an appropriate fit for a shaft and hole pair in a mechanical
assembly. What considerations should be made?
For a product that requires easy assembly without excessive force, what type of fit would you
select, and why?
Given a drawing with a specified fit (e.g., H7/g6), explain how to determine the limits for both the
hole and the shaft.
If a shaft has a tolerance of +0.02 mm and -0.01 mm, what would the resulting diameter be for a
nominal shaft size of 50 mm?
What would the effect be on the performance and cost of a mechanical assembly if the tolerances
were too tight or too loose?
02 Part II: Geometric Tolerances
What are geometric tolerances, and why are they essential in engineering drawings and
manufacturing?
What is the difference between dimensional tolerance and geometric tolerance?
Why is it important to control geometric characteristics like form, orientation, and position in
mechanical components?
How do geometric tolerances contribute to the interchangeability of parts?
What are the basic rules that must be followed when applying geometric tolerances to a part?
What is the significance of using geometric tolerances in relation to the part's function and
performance?
List the common symbols used for geometric tolerances and briefly explain the meaning of each.
What is a datum in the context of geometric tolerances, and why is it important?
How is a datum reference indicated on a drawing, and what does it represent?
Explain the difference between datum of equal importance, a primary, secondary, and tertiary
datum. How symbols for these datums are used in the tolerance frame. Explain with the sketch.
What is the role of datums in defining the tolerance zone for a part?
What is positional tolerance, and why is it commonly used in engineering drawings?
How do you interpret a positional tolerance when applied to holes or features in a part?
What is the concept of "true position" in relation to positional tolerance?
How does positional tolerance affect the manufacturing process and part assembly?
Explain orientation tolerance and its three main categories: angularity, perpendicularity, and
parallelism.
What is the purpose of controlling the orientation of features on a part, and how does this impact
assembly?
Explain the difference between profile geometric tolerance of a line and of a surface. Explain with
the help of sketch.
Explain the symbols for flatness and straightness tolerances and give examples of when each
would be used.
How do surface form tolerances like circularity and cylindricity ensure that parts meet functional
requirements?
What is runout, and why is it important to control in rotational parts?
What are the two types of runout tolerances, and how are they different?
How would you apply circular runout and total runout tolerances in an engineering drawing?
What kind of applications typically require runout tolerances? Provide examples.
How are geometric tolerances typically indicated on an engineering drawing, and what information
should be included?
What is the significance of a tolerance frame, and how is it used in the context of geometric
tolerances?
Give an example of a practical situation where you would apply form tolerance (e.g., flatness or
roundness) to ensure a part functions correctly.
Consider a part with a hole that needs to be positioned with a specific tolerance. How would you
apply positional tolerance, and what are the considerations for selecting a tolerance value?
How would you select an appropriate surface form tolerance for a part that requires a high level of
flatness for proper sealing?
Interpret the geometric tolerances on all following given drawings.
Q With the help of sketches, show how the geometrical tolerances are indicated, for the
following cases: i) Parallelism, ii) Symmetry, iii) Cylindricity, iv) Axial run-out and v)
Profile
03 Surface Roughness
What is surface roughness, and why is it an important parameter in mechanical engineering?
How does surface roughness differ from surface waviness and surface lay?
What are surface textures, and how are they characterized in terms of roughness, lay, and
waviness?
Explain how surface roughness affects the performance and functionality of mechanical
components.
Why is it essential to control surface roughness in applications like bearings, gears, and sealing
surfaces?
Explain the general structure of a machining symbol for surface roughness. What are the
components of this symbol?
How is the average roughness (Ra) value calculated, and what does it represent in terms of surface
texture?
What are roughness grades, and how are they categorized based on the required surface finish?
How do you select an appropriate roughness value (Ra) for a specific part depending on its function
and manufacturing process?
What are some typical roughness values for machined surfaces like those produced by turning,
grinding, or milling?
How do you specify surface roughness details on engineering drawings? What information is
included in the surface finish specification?
You are designing a shaft that will have a bearing surface. What surface roughness value would
you specify, and why?
How does the selection of a roughness grade (e.g., fine or coarse finish) impact the performance of
a part in an assembly?
Consider a part that requires a smooth sealing surface. What surface roughness value would you
select, and how would you indicate this on the drawing?
SP46
Q. Draw following any four thread profile with detail specifications defined with respect to pitch: 1) ISO
metric thread, 2) BSW thread, 3) Buttress thread, 4) Square thread, 5) ACME thread and 6) Worm
thread
Q Show by means of sketches, the method of showing location, symbol, size and depth of
following forms of weld: i) Single butt weld, ii) Single-bevel butt weld, iii) Continuous fillet
weld, iv) Double –U butt weld, v) Single-J butt weld, and vi) seam weld
Q Describe rules regarding position of welding symbols on drawings.
Q Sketch the conventional representation of a) internal threads, b) external treads, c)
Assembled threads parts
Q
Describe types of gears and their conventional representation.
Q Describe about different information which can be represented using welding symbol.
Q Describe guidelines for the conventional representation of different types of springs
Q
Describe any two locking arrangements for threaded parts.
Q How are following features dimensioned?
i) Taper features, ii) Chamfers, iii) Equi-distant features, iv) Screw threads and v) Repeated
features and vi) Square cross-section shaft
Q Explain the conventional representation of different gears with help of sketch.
Q With the help of figure describe construction of Gland and stuffing box. Also, list use of
Gland and Stuffing Box.
Q Write any eight different general rules referred for dimensioning in technical drawing.
Write difference between machine drawing and production drawing.
Q Explain classification of hydraulic valves ? Give symbols used for indicating following
any four elements in the machine drawing practice.
Butterfly valve 2) Gate Valve 3) Control Valve 4) Automated Valve 5) 3-Way solenoid
Valve
Q Write/Draw any eight abbreviations along with its meaning to use it on engineering
drawing as per standard.
Q Describe any four guidelines along with sketches for simplified representation of
appsembly of parts with fasteners.
Q What is the significance of section views in machine drawings? Write any two important
guidelines to represent sectional views.
Q Show conventional representation of assembly of threaded parts with the help of a sketch.
Describe guidelines.
Q Explain Stuffing Box and Gland arrangement using a sketch and describe any one
application.
Q With the help of figures explain how tolerance accumulation problem occurs in chain
dimensioning and how it can be controlled using parallel dimensioning.
