Complete exam-oriented Unit 1 page for RGPV students. Includes engineering materials, cast iron, carbon steel, iron-carbon diagram, mechanical properties, tensile test, stress-strain diagram, Hooke's law, hardness testing, impact testing and BHN.
Most important topics from Materials unit
Quick revision points for writing answers in exam
Engineering materials are used to manufacture machines, tools, structures and components. They are classified into metals, ceramics, polymers and composites.
Cast iron is an alloy of iron containing more than 2% carbon. It has high compressive strength, good machinability and brittle nature.
Carbon steel contains carbon up to 2%. It is classified into low carbon steel, medium carbon steel and high carbon steel.
Iron-carbon diagram shows relation between temperature, carbon percentage and phases present in steel and cast iron. Important phases are ferrite, austenite, cementite and pearlite.
Important mechanical properties are strength, hardness, toughness, ductility, brittleness and malleability.
Tensile test is performed to determine strength and deformation behaviour of material under tensile load.
Must remember formulas for numericals
High chance questions for RGPV exam
Repeated topics in RGPV previous year papers
| Topic | Repeated Questions | Frequency | Priority |
|---|---|---|---|
| Iron-Carbon Diagram | Explain diagram, phases, ferrite, pearlite, austenite, cementite | Very High | ★★★★★ |
| Stress-Strain Diagram | Explain ductile and brittle material stress-strain curve | Very High | ★★★★★ |
| Mechanical Properties | Hardness, toughness, ductility, malleability, brittleness | Very High | ★★★★★ |
| Tensile Test | Explain tensile test with neat diagram | High | ★★★★ |
| Hardness Testing & BHN | Brinell hardness test, BHN formula and numerical | High | ★★★★ |
| Cast Iron & Carbon Steel | Composition, properties, types and applications | High | ★★★★ |
| Hooke's Law | State Hooke's law, modulus of elasticity and numericals | Medium | ★★★ |
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Common exam doubts
Iron-Carbon diagram, stress-strain diagram, mechanical properties, tensile test and BHN are the most important topics.
You should practice Iron-Carbon diagram, stress-strain diagram, tensile test setup and Brinell hardness test diagram.
Stress, strain, modulus of elasticity, tensile strength and BHN numericals are important.