Board of Technical Examination

Department of Mechanical Engineering

Table of Specifications (ToS) - New C25 Curriculum (PUC Model)

Semester: I Course Code and Name: 25ME11I - Concepts of Mechanical Engineering - I

Cognitive
Remembering Understanding Application
Level
PART A B C D-I D-II A B C D-I D-II A B C D-I D-II Total
CO Weightag
Mark
No. 1M 1M 1M e
10 10 10 s
Type MC FI 2M 3M 5M MC FI 2M 3M 5M MC FI 2M 3M 5M
M M M
Q B Q B Q B
No. of
2 1 1 - - - - - - 1 1 - - - - - - -
CO-1 Questions
Marks 2 1 2 - - - - - - 3 5 - - - - - - 13 9%
No. of
6 1 3 1 - - - - - 2 2 - - - - - 1 2
CO-2 Questions
Marks 6 1 6 3 - - - - - 6 10 - - - - - 5 20 57 38%
No. of
5 2 3 2 - - - - - 1 3 1 - - - - - 1
CO-3 Questions
Marks 5 2 6 6 - - - - - 3 15 10 - - - - - 10 57 38%
No. of
2 1 1 - - - - - - 1 1 - - - - - - 1
CO-4 Questions
Marks 2 1 2 - - - - - - 3 5 - - - - - - 10 23 15%
Marks 15 5 16 9 - - - - - 15 35 10 - - - - 5 40 150
Total 45 60 45 150 100%
100
% 30% 40% 30%
%
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 1

Course: Concepts of Mechanical Engineering - I Course Code – 25ME11I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. What is the unit of force in the SI system?

a) dyne b) newton
c) kilogram d) joule

2. SI unit of moment or torque is _____________

a) Nm b) N/m
c) N d) W

3. Steel is an alloy of Iron and_________________

a) Manganese b) Copper
c) Tin d) Carbon

4. In grey cast iron, carbon is present in the form of ____________

a) Cementite b) Free carbon
c) Flakes d) Spheroids

5. The ability of materials to develop a characteristic behaviour under repeated loading known as-
a) Toughness b) Resilience
c) Hardness d) Fatigue

6. The response of a material due to the function of heat is known as __________

a) Mechanical property b) Electrical property
c) Chemical property d) Thermal property

7. Brass is alloy of Copper and ____________.

a) Zinc b) Lead
c) Iron d) Silver

8. Composites can be classified based on ___________.

a) matrix type b) Reinforcement constituent
c) matrix type & reinforcement constituent
d)neither on matrix type nor on reinforcement constituent type

9. A piston and cylinder arrangement in an internal combustion engine is an example of which

type of kinematic pair?
a) Turning pair b) Sliding pair
c) Rolling pair d) Spherical pair
10. Which of the following is an inversion of a single slider crank chain?
a) Whitworth quick return mechanism b) Four-bar linkage
c) Scotch yoke mechanism d) Beam engine

11. In which application is a flat belt drive commonly used?

a) Gearbox of a car b) Elevator system
c) Flour mill drive d) Bicycle transmission

12. Rope drives are best suited for which of the following applications?
a) Compact household appliances b) Connecting gearbox and crankshaft
c) Elevators and cranes d) Bicycles and motorcycles

13. Which type of gear has teeth parallel to the axis of the gear?
a) Helical gear b) Bevel gear
c) Spur gear d) Worm gear

14. A nut and bolt combination is an example of:

a) A welded joint b) A permanent joint
c) A threaded fastener d) A riveted joint

15. In TIG welding, the electrode used is:

a) Consumable b) Non-consumable tungsten
c) Copper rod d) Coated iron rod

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Work piece, Pressure, Pantograph, PVC, Force, Pitch) 5x1=5

1. Energy and work have the same SI unit because both involve _______ applied over a distance.
2. _______ is a thermoplastic polymer widely used in pipes and cables.
3. The _______ is a four-bar linkage used to copy or scale movements in control devices and plotting
instruments.
4. The imaginary circle that rolls without slipping when two gears mesh is called the _______ circle.
5. In arc welding, the electric arc is struck between the electrode and the _______.

PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10

1. Write the SI Units for the following derived quantities: a) Acceleration b) Energy
2. Define an Alloy.
3. What do you mean by Specific Heat.
4. Define Composites.
5. What is Mechanism.
6. Define “kinematic pair.”
7. Define Velocity ratio of a Belt drive
8. What is Brazing.
 PART- C

IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15

1. A car travels 90 meters in 6 seconds. Calculate its velocity and Acceleration.

2. List any three properties of High Speed Steel (HSS).
3. Mention the main constituents of Brass with its composition.
4. Explain Thermal Conductivity.
5. List the types of constrained Motions.
6. Define a Machine in the context of Kinematics.
7. Mention the different Materials used for Belts.
8. Write the Principle of Soldering.
PART- D (Section -I)
V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25
1. Calculate the Pressure exerted when the Force of 150N is applied over an area of 0.5m2. Express
your answers in kPa.
2. Differentiate Thermosetting Plastics and Thermoplastics.
3. Explain any two Mechanical Properties of Materials with examples.
4. Identify the suitable metal used in the production of Gear Housing of an automobile. Mention
its properties.
5. Explain 4-bar mechanism.
6. Differentiate between Chain and rope drives.
7. Two gear wheels having 80 teeth and 30 teeth mesh with each other. If the smaller gear wheel
runs at 480 rpm, find the speed of the larger wheel.
8. Explain Oxy-Acetylene gas welding process.

PART- D (Section -II)

VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30

1. Which cutting tool material is suitable for machining mild steel at moderate speeds? Justify your
choice based on alloying elements and properties.
2. Suggest two non-ferrous materials for a component to resist high temperature and corrosion.
Justify based on properties.
3. Discuss any two applications of inversions of slider crank mechanism with suitable sketches.
4. A flour mill uses a motor running at 1440 rpm connected to a shaft through an open belt drive.
The diameter of the motor pulley is 200 mm, and the shaft pulley is 500 mm. If the belt drive has
a 5% slip, determine: a) The speed of the shaft. b) Is the system suitable for constant load
transmission? Justify.
5. A workshop needs to join two mild steel plates permanently. Recommend a suitable welding
process and describe the steps involved in performing a fillet lap joint.
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 2

Course: Concepts of Mechanical Engineering - I Course Code – 25ME11I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. Which system of units is the internationally recognized standard for scientific and technical
measurements?
a. CGS System b. SI System
c. MKS System d. FPS System

2. What is the SI unit for work?

a. Watt (W) b. Pascal (Pa)
c. Newton (N) d. Joule (J)

3. Which of the following is an electrical property of a material?

a. Resistivity. b. Electrical resistance.
c. Magnetic permeability. d. Thermal expansion.

4. What is a common property of ceramic materials?

a. High thermal conductivity b. Excellent ductility
c. High melting points and good chemical stability d. Good electrical conductivity

5. Percentage of Carbon in Low carbon Steel

a. 0.05 to 0.3% b. 0.1 to 0.2%
c. 0.03 to 0.5 % d. 3 to 5%

6. Which of the following is an example of a thermoplastic polymer?

a. Polyurethane b. Epoxy
c. Bakelite d. ABS

7. Which of these materials is classified as a ferrous material?

a. Copper b. Aluminium
c. Titanium d. Steel

8. An alloy is a
a. Pure metal b. Mixture of metals in any proportion
c. Mixture of metals in fixed proportion d. Mixture of two non-metals

9. Lower pairs in kinematics are characterized by which type of contact between their elements?
a. No contact b. Surface contact
c. Point contact d. Line contact
10. The number of links in a double slider crank chain is:
a. 2 b. 4
c. 3 d. 5

11. Which of the following is not a type of belt drive?

a. Open belt drive b. Cross belt drive
c. Compound belt drive d. Radial belt drive

12. The pulley which receives power from the belt is called:
a. Driver b. Driven
c. Idler d. Shaft

13. The module of a gear is defined as

a. Pitch diameter × Number of teeth b. Pitch diameter / Number of teeth
c. Number of teeth / Pitch diameter d. Face width / Addendum

14. The main classification of welding processes is based on:

a. Shape of metal b. Base material
c. Source of heat d. Type of joint

15. Which of the following is not a type of nut?

a. Hex nut b. Wing nut
c. Castle nut d. Dowel nut

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Corrosion, Fixed, Slider crank, Capillary, gram per cc, Moving) 5 x 1 = 5

1. The unit of density in the CGS system is ______.

2. The formation of iron oxide in the presence of water and oxygen is an example of ______.
3. The Whitworth quick return mechanism is a modified version of the ______ mechanism.
4. In an epicyclic gear train, at least one gear rotates about a ______ axis.
5. In both soldering and brazing, the filler metal is distributed between closely fitted surfaces by
______ action
PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10

1. Define Least Count.

2. List the types of Cast Iron.
3. State any two application of Duralumin.
4. Define Magnetic Permeability.
5. What is Pantograph.
6. What is Creep in the context of Belt drives.
7. Name any two types of Gear trains.
8. Give any two examples of temporary fasteners.
 PART- C
IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15
1. For baking a cake at 3560 F, what temperature should you set in your oven in Celsius (oC)? Show
the Conversion.
2. Classify Steels based on the percentage of Carbon content.
3. Explain Malleability and Ductility of a material.
4. Mention any three distinct properties of Ceramics.
5. List the types of kinematic links.
6. List the various types of belt drives.
7. Explain Pressure angle with respect to Gears.
8. List any three defects of Welding.
PART- D (Section -I)
V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25
1. A constant Force of 25N moves an object at a distance of 10m. Calculate the work done in Joules
(J), Convert it into CGS and FPS units.
2. Explain the classification of Engineering materials.
3. Explain how the composite materials are differing from other materials in engineering
applications.
4. Identify the Nickel alloy used in the production of Impellers. Justify the selection based on its
properties.
5. Explain the mechanism used in Shaping machine.
6. A pair of spur gears transmits motion between two parallel shafts. If the driving gear has 20
teeth and rotates at 1200 RPM, and the driven gear has 40 teeth, calculate the speed of the driven
gear.
7. Differentiate Machine and Structure.
8. Explain Arc welding process.
PART- D (Section -II)
VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30

1. Which two mechanical properties are critical for a cutting tool used on hardened steel at high
speeds? Justify your choices.
2. Discuss why brass, is often preferred for plumbing pipes and fittings over pure copper or other
metals. Highlight its composition and properties.
3. Discuss the components of a four-bar chain Mechanism and their functions.
4. Identify and briefly explain the type of gear drives used for the following conditions:
a) When the axes of the shafts are parallel b) When the axes of the shafts are Perpendicular
5. Identify the type of fastener used in the assembly of Bus body /Rail coaches and Bridges. Justify
why it is preferred over other fasteners.
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 3

Course: Concepts of Mechanical Engineering - I Course Code – 25ME11I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. Derived units can be expressed in terms of ________.

a. Fundamental units b. Arbitrary units
c. Base units d. Standard units

2. The fundamental units of SI system are the same as that of

a. MKS System b. CGS System
c. FPS System d. None of the above

3. The tendency of a deformed solid to regain its actual proportions instantly upon unloading
known as ______________.
a. Perfectly elastic b. Inelastic effect.
c. Plasticity d. Delayed elasticity.

4. Medium Carbon steels are tougher than

a. High Carbon steel b. Plain carbon steel
c. Low carbon steel d. None of the above

5. Gun metal Contains

a. 70% copper and 30% zinc b. 90% copper and 10% tin
c. 85 to 92% copper rest with tin little with nickel and lead
d. 70 – 80 % copper rest with tin

6. The aluminum alloy mainly used for anodized utensil manufacture is

a. Y alloy b. Hindalium
c. Magnalium d. Duralumin

7. In nodular iron graphite is in the form of?

a. Spheroids b. Free carbon
c. Flakes d. Cementite

8. Which industry is the largest user of composite materials?

a. Transportation b. Marine
c. Construction d. Sports

9. A mechanism is an assemblage of
a. Two links b. Four or more than four links
c. Three links d. All the above
10. Which of these is an inversion of a single slider crank chain?
a. Coupling rod of a locomotive b. Beam engine
c. Watt’s indicator mechanism d. Pendulum pump

11. V-belts are usually used for

a. long drives b. short drives
c. long and short drives d. none of the mentioned

12. Which type of chain is commonly used for power transmission?

a. Leaf chain b. Roller chain
c. Silent chain d. Bead chain

13. The main disadvantage of gear drive is:

a. Low efficiency b. Slipping of motion
c. Inaccurate speed ratio d. Frequent lubrication needed

14. Which joint type is not typically used in brazing?

a. Lap Joint b. Threaded Join
c. Butt Joint d. Corner joint

15. The color of a neutral oxy-acetylene flame is:

a. Blue b. Yellow
c. Orange d. White

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Link, Kinematic pair, Volume, stick, Ceramic, Polymers) 5x1=5
1. The amount of space occupied by an object is its ________.
2. Epoxy, polyester, and vinyl ester are types of ________ used as matrices in composites.
3. A connection between two rigid bodies (links) in a mechanism that imposes constraints on their
relative motion is called a ________.
4. In a mechanism, a rigid body or an assembly of rigid bodies that has motion relative to other
parts is called a ________.
5. SMAW, commonly known as ________ welding, uses a consumable electrode coated in flux to
create the arc and provide shielding.
PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10

1. Define Temperature.
2. What is cast iron.
3. Define fatigue of a material.
4. What are biodegradable polymers?
5. Define structure in the context of Kinematics.
6. Name any two inversions of the 4 bar chain.
7. Define Dedendum of gear.
8. What is the primary function of an electrode in arc welding?
 PART- C
IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15
1. A small metal block has a mass of 400grams and dimensions of 4cm x 3cm x 2cm. Calculate the
volume and density of the block. Represent in SI units.
2. What do you mean by 40C8 Steel.
3. Mention the importance of Alloying.
4. Classify composite materials.
5. Define Rigid link and give examples.
6. Write the expression for Speed ratio of Gear train with nomenclature.
7. Mention the effects of slip in belt drives.
8. Mention the fillers used Soldering and Brazing.
PART- D (Section -I)
V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25

1. A machine performs 500 Joules of work in 5 seconds. Calculate the Power output in Watts (W),
convert it into CGS and FPS System of units.
2. Explain any one Nickel based alloy.
3. Discuss the Chemical properties of engineering materials.
4. Select the suitable polymer used in the electrical switch board. Mention its properties.
5. Explain the working of Epicyclic Gear train.
6. Discuss the advantages of V-belt drives over flat belt drives.
7. Discuss the type of kinematic pair used in the following applications.
i) Piston and cylinder ii) Nut and Bolt
8. Differentiate between temporary and permanent joining process.

PART- D (Section -II)

VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30
1. Component A faces sudden impact; Component B deforms under static overload. a) What
property is crucial and what is not acceptable for A? Justify. b) What property is desirable for B?
Justify.
2. Which non -ferrous metals are suitable for making bearings and bushes and making cutting tool
inserts. Mention why those are to be chosen based on its properties.
3. Discuss Double slider crank and Scotch Yoke mechanisms with suitable sketches.
4. An engine, running at 150 r.p.m., drives a line shaft by means of a belt. The engine pulley is 750
mm diameter and the pulley on the line shaft being 450 mm. A 900 mm diameter pulley on the line
shaft drives a 150 mm diameter pulley keyed to a dynamo shaft. Find the speed of the dynamo
shaft, when 1. there is no slip, and 2. there is a slip of 2% at each drive.
5. Why is brazing suitable for repairing a broken cast iron bracket without melting the base metal?
Suggest a suitable filler material and justify.
 Board of Technical Examination
Department of Mechanical Engineering
Table of Specifications (ToS) - New C25 Curriculum (PUC Model)

Semester: II Course Code and Name: 25ME21I - Concepts of Mechanical Engineering - II

Cognitive
Remembering Understanding Application
Level
PART A B C D-I D-II A B C D-I D-II A B C D-I D-II Total
CO Weightag
Mark
No. 1M 1M 1M e
2 3 5 10 2 3 5 10 2 3 5 10 s
Type MC MC MC
FIB M M M M FIB M M M M FIB M M M M
Q Q Q
No. of
6 1 3 2 1 - 1 - 2 2 2 - - - - - 1 1
CO-1 Questions
Marks 6 1 6 6 5 - 1 - 4 6 10 - - - - - 5 10 60 40%
No. of
1 1 - 1 - - 1 - 1 - 1 - - - - - - 1
CO-2 Questions
Marks 1 1 - 3 - - 1 - 2 - 5 - - - - - - 10 23 15%
No. of
1 1 1 - - - 1 - - 1 1 - - - - - - -
CO-3 Questions
Marks 1 1 2 - - - 1 - - 3 5 - - - - - - - 13 9%
No. of
1 1 - 1 - - 1 - 1 - 1 - - - - - - 1
CO-4 Questions
Marks 1 1 - 3 - - 1 - 2 - 5 - - - - - - 10 23 15%
No. of
2 1 - - 1 - 1 - - 1 - 1 - - - - - 1
CO-5 Questions
Marks 1 1 - - 5 - 1 - - 3 - 10 - - - - - 10 31 21%
Marks 10 5 8 12 10 0 5 - 8 12 25 10 - - - - 5 40 150
Total 45 60 45 150
100
% 30% 40% 30%
%
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 1

Course: Concepts of Mechanical Engineering - II Course Code – 25ME21I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. When each atom in a crystal structure is replaced by a point, then it is known as

a) Lattice Spacing b) Atomic Spacing
c) Crystal Lattice d) None of the above

2. In FCC, the unit cell shares _____ atoms, with the neighbouring unit cells.
a) 8 b) 14
c) 12 d) 20

3. For steel, which one of the following properties can be enhanced upon annealing?
a) Hardness b) Toughness
c) Ductility d) Resilience

4. In normalizing, cooling is done in which of the following medium?

a) Air b) Water
c) Oil d) Furnace

5. Cyaniding is usually done for _________

a) Plain carbon steels b) Cast irons
c) Stainless steels d) Pig iron

6. Which type of corrosion occurs when two dissimilar metals are in electrical contact in the
presence of an electrolyte?
a) Stress corrosion cracking b) Erosion corrosion
c) Galvanic corrosion d) Pitting corrosion

7. Which of the following is a common example of a natural biomaterial?

a) Polyethylene b) Titanium
c) Collagen d) Stainless Steel

8. Material is commonly used as filament in FDM technology?

a) Titanium b) ABS plastic
c) Epoxy resin d) Silicon carbide

9. Which of the following is a casting defect?

a) Draft allowance b) Shrinkage cavity
c) Permeability d) Loam sand
10. Which of the following metal forming processes is best suitable for making the wires?
a) Forging b) Extrusion
c) Drawing d) Rolling

11. Which of the following articles cannot be made from rolling?

a) Rails b) Helmets
c) Bars d) Plates

12. Which tool is used to hold and support the sheet metal during punching or blanking?
a) Die b) Press brake
c) V-block d) Spindle

13. A hydraulic press works based on:

a) Air compression b) Electric heating
c) Pascal’s Law of fluid pressure d) Vacuum force

14. Which of the following is NOT a type of cutting tool?

a) Single-point tool b) Multi-point tool
c) Abrasive tool d) Welding torch

15. A radial drilling machine is preferred for:

a) Small, precise holes b) Drilling holes in large, heavy work pieces
c) High-speed drilling of plastics d) Micro-drilling operations

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Forging, Slicing, Flywheel, Facing, Post Processing, Mechanical Strength) 5x1=5
1. For orthopaedic implants, ___________ property is most crucial for a biomaterial to withstand
forces.
2. The last step in the additive manufacturing process is _________________
3. In___________ process, metal is both compressed and shaped by hammer or press.
4. In mechanical presses _____________part stores rotational energy.
5. Creating a flat surface at the end of a work piece in lathe is known as ________________.

PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10
1. Mention one application in each BCC and FCC structures.
2. List any two objectives of Hardening process.
3. Define Electroplating.
4. Define unit cell in crystal structure.
5. Highlight any two properties required for a good solar cell.
6. Mention any two important properties moulding sand.
7. Define Extrusion metal forming process.
8. Write any two press operations with examples.
 PART- C
IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15
1. Sketch the unit cell of FCC and label the atomic position.
2. Name any three advanced coating technologies.
3. Explain the steps involved in the heat treatment process.
4. Highlight the advantages of carbon Nano tubes in engineering applications.
5. List the steps involved in Additive manufacturing process.
6. Explain the basic principle of Forging process.
7. Define shearing in sheet metal with two examples.
8. Explain Up-Milling operation.

PART- D (Section -I)

V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25
1. Define the following terms: Coordination number, Lattice point, and Packing factor.
2. Explain Laser surface treatment process.
3. What are shape memory alloys (SMAs)? Explain their unique property and mention two
applications where SMAs are used.
4. Identify and explain the appropriate surface hardening process for the Stainless steels used in
various industrial applications.
5. Highlight the different Additive Manufacturing Technologies.
6. Mention the applications of Rolling process of metal forming.
7. Explain any two components of Press.
8. Classify Cutting tools.

PART- D (Section -II)

VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30
1. Which heat treatment processes ensure both strength and surface hardness for engine
components? Justify with process details and property changes.
2. A casting company faces dimensional inaccuracies in products. How would proper selection of
pattern material and allowances solve this issue? Justify with examples.
3. Which sheet metal operations and gauges are suitable for car body panels? Justify your choice.
4. Explain any five operations that can be performed on a drilling machine. Describe the purpose
of each operation with neat sketches.
5. A component requires external threads on a steel rod. Describe how thread cutting is done on a
lathe and mention the precautions to be taken.
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 2

Course: Concepts of Mechanical Engineering - II Course Code – 25ME21I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. What does BCC stand for in crystal structures?

a) Brave-Cubic Crystal b) Bond-Centered Crystal
c) Body-Centered Cubic d) Base-Centered Cubic

2. What is the approximate Atomic Packing Factor (APF) for a Face-Centered Cubic (FCC) crystal
structure?
a) 0.80 b) 0.68
c) 0.52 d) 0.74

3. Which of the following process needs no quenching?

a) Induction hardening b) Flame hardening
c) Nitriding d) Carburizing

4. How is the heating of surface done in flame hardening technique?

a) Oxy-acetylene torch b) Carburizing flame
c) Electrode d) Direct sunlight

5. CVD stands for:

a) Chemical vapor deposition b) Corrosion vapor diffusion
c) Coated vapor device d) Chromic vapor delivery

6. Biomaterials are primarily used for:

a) Power generation b) Structural support in buildings
c) Replacing or supporting biological tissues d) Manufacturing of semiconductors

7. Which of the following is a magnetic shape memory alloy?

a) Nitinol b) Copper
c) Ni–Mn–Ga d) Titanium

8. Sprue in casting refers to.......

a) Gate b) Runner
c) Riser d) Vertical passage

9. The abbreviation SLS in AM refers to

a) Surface Layer Simulation b) Selective Laser Sintering
c) Solid Light Structuring d) Standard Laser Sheet
10. Which of the following is NOT a metal forming process?
a) Forging b) Casting
c) Rolling d) Extrusion

11. Forging is generally performed at:

a) Room temperature only b) High temperature (hot working)
c) Cryogenic temperatures d) Sub-zero temperatures

12. The moving part that holds and drives the punch is known as the:
a) Frame b) Base
c) Ram or Slide d) Bolster

13. Which of the following tools is not used in sheet metal work?
a) Punch b) Die
c) Milling cutter d) Press brake

14. The most important personal protective equipment (PPE) in a machine shop is:
a) Safety glasses b) Jewellery
c) Loose gloves d) Open-toe shoes

15. In a grinding wheel designation "A46-K5-V8", what does 'A' stand for?
a) Abrasive type (Aluminum oxide) b) Grain size
c) Grade d) Bond type

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Polymorphism, Wax, Extrusion, Reaming, Drawing, Blanking) 5x1=5
1. An ability of a metal to exist in more than one crystal structure, depending on temperature
and pressure, is known as ________________
2. The material commonly used for making patterns is___________
3. The metal forming processes performs squeezing out of material through a hole is __________
4. ___________________ process involve removing a scrap piece from a sheet.
5. Creating a smooth, accurate hole by enlarging an existing hole is called ______________

PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10
1. Write the Atomic Packing Factor for FCC and BCC structure.
2. List the steps followed in Annealing process.
3. Name any two methods to reduce corrosion in metals.
4. Mention any two properties of Shape Memory Alloy.
5. What is the purpose of case hardening?
6. Mention any two limitations of Additive manufacturing
7. Define rolling in metal forming?
8. Write any two purposes of die in Press tool set.
 PART- C
IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15
1. Sketch the unit cell of BCC and label the atomic position.
2. Define Corrosion lit its types.
3. Explain the purpose of heat treatment process.
4. Mention the advantages of using PVDF in piezoelectric applications
5. Name the pattern allowances.
6. Explain three applications of Extrusion process in manufacturing.
7. List the safety precautions to be followed in Sheet metal shop.
8. Explain Taper turning operation in Lathe.

PART- D (Section -I)

V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25
1. State the mechanical properties commonly associated with BCC, FCC, and HCP crystal
structures. Give one example of each metal and its application.
2. Explain Physical Vapour Deposition method of Surface treatment.
3. Explain the functions of lithium-ion batteries and silicon-based solar cells. Mention one
advantage of each.
4. Identify the heat treatment process suitable for a steel shaft used in a high – speed turbine.
Highlight the properties improved after heat treatment.
5. Explain any one type of Pattern with neat sketch.
6. Highlight the applications of Wire drawing metal forming process.
7. Explain any two Press work operations.
8. List the characteristics of cutting tool materials.

PART- D (Section -II)

VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30
1. Compare case hardening and surface hardening by application, hardness depth, and component
needs. Suggest suitable methods for gears and cutting tools with reasons.
2. Explain the step-by-step AM process for producing a polymer component.
3. Suggest suitable material, gauge, and sheet metal operations for an aircraft body part. Explain
why.
4. Explain the nomenclature of a twist drill and its significance in drilling operations.
5. Describe the classifications of lathe machines. Which type of lathe is preferred for machining
long work pieces and why?
 Govt. of Karnataka
Department of Technical Education
Board of Technical Examinations

Model Question Paper – 3

Course: Concepts of Mechanical Engineering - II Course Code – 25ME21I

Time: 3 Hrs Max. Marks: 100

Instructions:
For Part –A Questions, only the first written answers will be considered for Evaluation.

PART- A
I. Select the correct answers from the choices given 15 x 1 = 15

1. Which of these materials is non-crystalline?

a) Table salt (NaCl) c) Window glass
c) Ice d) Diamond

2. Which of these crystal structures is NOT considered a close-packed structure?

a) Body-Centered Cubic (BCC) b) Face-Centered Cubic (FCC)
c) Hexagonal Close-Packed (HCP) d) Both FCC and HCP

3. What are the applications of Nitriding?

a) Gears, camshafts b) Valve guides and seatings
c) Chain links, nuts, bolts, and screws d) Gears, nuts, bolts

4. Which one of the following is a case hardening process?

a) Recrystallization b) Strain hardening
b) Carburizing d) Spheroidizing

5. In electroplating, the object to be plated is connected to:

a) Anode b) Cathode
c) Both d) Earth

6. Which of the following is a natural piezoelectric material?

a) PZT b) Quartz
c) PVDF d) Nitinol

7. Nanomaterials typically have particle sizes in the range of:

a) 1–100 mm b) 1–100 cm
c) 1–100 nm d) 1–100 µm

8. What is the full form of FDM in Additive Manufacturing?

a) Functional Design Modelling b) Fused Deposition Modelling
c) Final Deposition Method d) Formed Direct Machining

9. Investment casting is also known as:

a) Die casting b) Shell moulding
c) Lost wax process d) Vacuum casting
10. The action of applying force to deform the metal without cutting is known as:
a) Piercing b) Drawing
c) Forming d) Cutting

11. The hot working in metal forming is done:

a) Above recrystallization temperature b) Below recrystallization temperature
c) At melting point d) At freezing point

12. The sheet metal operation helps in joining two overlapping sheets by localized deformation
is ____________.
a) Riveting b) Welding
c) Hemming d) Spinning

13. A press is a machine used to:

a) Cast metal b) Apply pressure to deform or cut materials
c) Weld sheets d) Drill holes only

14. The main function of a drill chuck is to:

a) Cool the drill bit b) Hold and rotate the drill bit
c) Measure hole depth d) Lubricate the work piece

15. A turret lathe differs from an engine lathe by having:

a) Multiple cutting tools on a rotating turret b) Higher spindle speeds
c) No tailstock d) Automatic feed mechanisms

II. Fill in the blanks by choosing appropriate answer from those given in the bracket.
(Polylactic acid, Electrical Cable, up, Punching and Blanking, Climb, Galvanizing) 5 x 1 = 5
1. ____________ process involves dipping steel parts in molten zinc.
2. ________________ is a biodegradable and used in eco-friendly 3D printing.
3. A major application of wire drawing is in the manufacturing of ________________.
4. _______________ operation is used to create washers using a press.
5. in _________________ milling, the cutter rotates in the same direction as the feed.

PART- B
III. Answer ANY FIVE of the following. Each question carries two marks. 5 x 2 = 10
1. Define Crystalline materials with example.
2. Name any two Case hardening processes.
3. Define Physical vapour deposition method of Surface treatment.
4. Mention any two properties of Nano materials.
5. Mention two piezoelectric materials used in electronic devices.
6. What is the importance of providing shrinkage allowance in a pattern.
7. What is bar drawing?
8. Write any two applications of sheet metal working process.
 PART- C
IV. Answer ANY FIVE of the following. Each question carries three marks. 5 x 3 = 15
1. Sketch the unit cell of HCP and label the atomic position.
2. Write the purpose of spraying in surface coatings.
3. Explain the purpose of normalizing.
4. Mention any two application of Bio materials in the human body.
5. List any three types of Moulding sand with their properties.
6. Compare direct and indirect extrusion process.
7. List any 3 major components of Press machine.
8. Mention any three properties of an abrasive material used in Grinding wheel.

PART- D (Section -I)

V. Answer ANY FIVE of the following. Each question carries Five marks. 5 x 5 = 25
1. Compare BCC, FCC and HCP crystal structure based on Atomic arrangement and coordination
number.
2. Explain Chemical Vapour Deposition method of surface treatment.
3. What are shape memory alloys (SMAs)? Explain their unique property and mention two
applications where SMAs are used.
4. Why is annealing crucial for copper components used in electrical applications? Justify your
answer.
5. Explain the principle of Fused Deposition Modelling.
6. Mention the safety precautions to be followed while performing forging activity.
7. Explain any two Sheet metal operations.
8. Explain Polishing and Coating operations.

PART- D (Section -II)

VI. Answer ANY THREE of the following. Each question carries Five marks. 10 x 3 = 30
1. Which heat treatment is suitable for shafts requiring hard surface and tough core? Explain the
principle, process, and benefits.
2. Identify common defects in casting and suggest strategies to prevent them.
3. Which press operation is best for mass-producing washers? Explain the process with reasons.
4. Explain the nomenclature of a single point cutting tool and its significance in lathe operations.
5. Describe the classifications of milling machines. Which milling machine type is preferred for
machining large work pieces and why?