Class 11 Automotive Service Technician Chapter 3 Material

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

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