Class 11 Automotive Service Technician Chapter 3 Material Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Automotive Service Technician Chapter 3 Material Question Answer and select need one. Class 11 Automotive Service Technician Chapter 3 Material Notes Download PDF. AHSEC Class 11 Automotive Service Technician Question Answer English Medium.
Class 11 Automotive Service Technician Chapter 3 Material
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Class 11 Automotive Service Technician Chapter 3 Material Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Automotive Service Technician Textbook Solutions English Medium for All Chapters, You can practice these here.
Material
Chapter: 3
| SESSION 1: ENGINEERING MATERIAL |
| Check Your Progress |
A. Fill in the blanks:
1. ____________ and ____________ contain a high proportion of iron.
Ans: Ferrous metals, alloys.
2. ________ is an alloy of carbon and iron.
Ans: Steel.
3. Steels containing ________ to ________ carbon are called plain carbon steels.
Ans: 0.03 % to about 1.2 %.
4. Steels containing up to ________ carbon are called dead mild steel.
Ans: 0.15 %.
5. Blocks of many automobile and tractor assemblies are made of ________.
Ans: Cast iron.
B. Multiple choice questions:
1. Alloy steels containing up to 5% of total alloying elements are called _____________.
(a) Low alloy steels.
(b) Medium alloy steel.
(c) Hard steel.
(d) None of the above.
Ans: (a) Low alloy steels.
2. Mechanical properties of alloy steel, such as yield strength, ductility, are improved by _____________.
(a) Alloying.
(b) Welding.
(c) Quenching.
(d) Moulding.
Ans: (a) Alloying.
3. The material used to construct vehicle chassis and frames is _____________.
(a) Carbon steel or aluminium alloys.
(b) Iron or chromium.
(c) Copper or steel.
(d) Mould material.
Ans: (a) Carbon steel or aluminium alloys.
4. The fast cooling of iron with 2%–4.3 % carbon produces ___________________.
(a) White cast iron.
(b) Grey cast iron.
(c) Hard iron.
(d) Mild cast iron.
Ans: (a) White cast iron.
5. When white cast iron cools down slowly, the resulting product is known as________________.
(a) Malleable cast iron.
(b) Hard iron.
(c) Grey iron.
(d) None of the above.
Ans: (a) Malleable cast iron.
C. Answer the following questions:
1. Differentiate between glass and rubber.
Ans: The different between glass and rubber are:
| Glass | Rubber |
| Mainly made of silica, soda, lime, and other compounds. | Made from natural latex or synthetic polymers. |
| Glass is primarily used for windshields, rear-view and side mirrors, and now for advanced applications like navigation screens and back-up camera lenses. | Rubber is used in the automotive industry for various parts such as tyres, wiper blades, engine mounts, seals, hoses, and belts. |
| Hard, brittle, and solid at room temperature. | Flexible, elastic, and soft. |
| Prone to shattering or breaking. | Resilient, absorbs shocks and vibrations. |
2. Explain the role of plastic in the automotive industry.
Ans: Plastics, a key material used in the automotive industry, is lightweight, corrosion resistant, flexible, durable and gives high performance at low costs. The properties of plastic can be improved through chemicals.
Advantages of using plastics in the automotive industry:
(i) It is durable, impact-resistant, and corrosion-resistant.
(ii) It is flexible, allowing freedom in designing and mixing components.
(iii) It is inexpensive.
(iv) It is lightweight, leading to energy savings and reduced pollution.
In 1984, the average new car contained 8.5% plastics by weight and today similar cars contain around 11% plastics. The increased use of plastics reduces the mass of vehicles and consequently emissions. A quick look inside any model of the car may show that plastics are now used in both exterior and interior components, such as bumpers, doors, safety and windows, headlight and side-view mirror housing, trunk lids, engine intake manifolds, fuel tanks, steering wheels, interior door panels, built-in speaker baffles, door handles, wheel covers, dashboards, hoods, grills, gauges, dials, switches, air conditioner vents, floor mats, seat belts, airbags, wheel covers, etc.
| SESSION 2: BASIC MANUFACTURING PROGRESS |
| Check Your Progress |
A. Fill in the blanks:
1. Pouring of ______________ into a mould is called casting.
Ans: Molten metal.
2. The processing of raw material or parts into finished goods with the use of tool is called ______________.
Ans: Manufacturing.
3. ______________ is the process of removing undesired material from a work piece.
Ans: Machining.
4. In milling ______________ are used to remove material from a work piece.
Ans: Rotary cutters.
5. ______________ is done to get desired surface finish, correct size and accurate shape of product.
Ans: Grinding.
B. Multiple choice questions:
1. In which method is the required size and shape obtained through plastic deformation of a material?
(a) Forming.
(b) Machining.
(c) Honing.
(d) Welding.
Ans: (a) Forming.
2. All the sections of steels, such as channel, I-section, channel section, angle sections, flat, iron, sheets, etc., are produced by ____________.
(a) Rolling.
(b) Welding.
(c) Moulding.
(d) Casting.
Ans: (a) Rolling.
3. Auto components like crankshaft, camshaft, connecting rod, tie rod ends, ball joints, are prepared by _____________.
(a) Forging.
(b) Forming.
(c) Extrusion.
(d) Drawing.
Ans: (a) Forging.
4. When a metal is extracted through a closed cavity to obtain desired shape of metal that process is called ________________.
(a) Extrusion.
(b) Forming.
(c) Welding.
(d) Moulding.
Ans: (a) Extrusion.
5. The process of joining the similar and dissimilar material is called ______________.
(a) Welding.
(b) Drawing.
(c) Casting.
(d) None of the above.
Ans: (a) Welding.
C. Answer the following questions:
1. Differentiate between rolling and forming.
Ans: The differences between rolling and forming are as follows:
| Rolling | Forming |
| A process where material is passed through two revolving rolls to reduce thickness and shape it. | A process where material is deformed plastically to obtain the required shape and size. |
| Involves shaping metal by passing it through rollers to reduce thickness or create a specific shape. | Involves shaping metal into a desired shape using various techniques like bending, pressing, or stretching. |
| Primarily focused on reducing thickness and creating uniform shapes like sheets, plates, or rods. | To change the shape of the metal into a desired form, which could be a complex shape beyond simple thickness reduction. |
| Typically used for producing flat or curved metal products like sheets, plates, or bars. | Can be used to create complex shapes and geometries. |
| Shape rolling, flat rolling, ring rolling, gear rolling, thread rolling. | Deep drawing, bending, extrusion, forging. |
2. Explain the different types of joining processes.
Ans: Joining processes are those processes that are used for joining metal parts and metal fabrication work.
They are of four types:
(a) Welding.
(b) Soldering.
(c) Brazing.
(d) Adhesive Bonding.
They are explained below:
(a) Welding: Welding is the process of joining a similar and dissimilar material. In this process, two parts are joined together under heat or pressure with or without added metal. The welding process is divided into two categories, plastic welding or pressure welding and fusion welding or non-pressure welding, respectively.
(b) Soldering: Soldering is a joining process that involves heating two or more materials to a temperature below their melting point, and using a filler metal (solder) to form a bond. The solder used has a lower melting point than the materials being joined. Soldering is often used in electronics for making connections between components and wires. It is also used in plumbing and for making jewelry.
(c) Brazing: Brazing is similar to soldering but involves higher temperatures, typically above 450°C. In brazing, a filler metal is also used, but unlike soldering, it is heated to a temperature above its melting point. The filler metal flows into the joint and bonds the two materials. It can be used for joining dissimilar metals and provides strong and durable joints
(d) Adhesive Bonding: Adhesive bonding is a process where materials are joined using an adhesive substance, creating a strong bond through chemical or physical mechanisms. It offers advantages like uniform stress distribution, ability to join dissimilar materials, enhanced sealing and insulation, and reduced weight. This technique is widely used in industries like automotive, aerospace, construction, and electronics for assembling components and bonding materials.
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