Unit 1 Basics of Engineering Materials PDF

Unit – I BASICS OF ENGINEERING MATERIALS Crystal structure is arrangement of ________________in different patterns 1 A Electrons C Atoms B Protons D Crystal...

Unit – I BASICS OF ENGINEERING MATERIALS Crystal structure is arrangement of ________________in different patterns 1 A Electrons C Atoms B Protons D Crystals The arrangement of multiple unit cell together is called 2 A Unit cell C Crystal lattice B Crystal structure D Amorphous material The unit cell represents ________________ of a crystal structure 3 A Weight C Length B Size D Geometry of atomic arrangement In simple cubic structure there are _________________ number of total atoms 4 A 8 C 16 B 9 D 20 __________________ is defined as mass per unit volume of a material 5 A Specific Heat C Specific Heat B Density D Thermal conductivity- Thermal conductivity is The ability of a metal to transmit It is increase in dimension of material when A C 6 heat throughout its mass heated It is the capacity of metal to It is the temperature at which the metal B D conduct an electric current changes from a solid to a molten state. ________________ is the ratio of density of material to density of water. 7 A Density C Thermal Expansion B Specific Gravity D Specific Heat ___________________ is the ability of a material to deform under tensile load 8 A Strength C Malleability B Elasticity D Ductility _____________________ is the ability of the material to be flattened into thin sheets under applications of heavy compressive forces without cracking 9 A Brittleness C Malleability B Ductility D Elasticity _________________ is the ability of a material to undergo irreversible or permanent deformations without breaking or rupturing 10 A Strength C Elasticity B Plasticity D Brittleness ___________is the ability of a material to return to its original size and shape when the stress is removed 11 A Elasticity C Ductility B Plasticity D Malleability The ability of material to resist softening at high temperature is known as __________ 12 A Creep C Fatigue B Super Hardening D Hot Hardness Malleability of material can be defined as Ability to undergo large Ability to recover its original form A permanent deformation in C 13 compression Ability to undergo large Ability to withstand shocks and vibrations B permanent deformation in D tension Slow plastic deformation of metals under constant stress at high temperature is known as 14 A Fatigue C Endurance B Creep D Plasticity The material with iron as its main constituent is known as 15 A Amorphous material C Ferrous material B Crystalline material D Non-Ferrous material Page 1 of 4  Which of the following is the amorphous material 16 A Steel C Cast iron B Rubber D Brass Which of the following is the amorphous material 17 A Rubber C Plastic B Glass D All of the above Which of the following is the crystalline material 18 A Glass C Steel B Rubber D Plastic Crystalline materials have A Melting point below 1000 degree C Indefinite arrangement in crystal structure 19 Celsius B Definite arrangement in crystal D All of the above structure Which of the following is the brittle material 20 A Aluminum C Low carbon steel B Ceramics D Mild steel Which of the following is the brittle material 21 A Cast iron C Glass B Ceramics D All of the above Which of the following is the ductile material 22 A Low carbon steel C Ceramics B Cast iron D Concrete Which of the following is the ductile material 23 A Aluminum C Mild steel B Low carbon steel D All of the above Ability to withstand surface indentation and scratching is known as 24 A Toughness C Hardness B Ductility D Malleability Ability of a material to absorb shocks and vibrations is known as 25 A Toughness C Hardness B Ductility D Malleability The failure of material at a lower stress due to repetitive or fluctuating stress is known as 26 A Tensile failure C Creep failure B Fatigue failure D Plastic failure Durability is defined as A Ability to withstand surface C Ability to withstand wear, pressure, or 27 indentation and scratching damage B The ability of material to resist D Ability of a material to undergo irreversible stress without failure or permanent deformations Plasticity is defined as A Ability to withstand surface C Ability to withstand wear, pressure, or 28 indentation and scratching damage B The ability of material to resist D Ability of a material to undergo irreversible stress without failure or permanent deformations Elasticity is defined as A Ability to withstand surface C Ability to withstand wear, pressure, or indentation and scratching damage 29 B Ability of a material to return to its D Ability of a material to undergo irreversible original size and shape when the or permanent deformations stress is removed Strength is defined as A Ability to withstand surface C The ability of material to resist stress indentation and scratching without failure 30 B Ability of a material to return to its D Ability of a material to undergo irreversible original size and shape when the or permanent deformations stress is removed Page 2 of 4  The solid solution in which the solute atoms fill some of the holes between solvent atoms is known as___________ solid solution 31 A Alloy C Interstitial B Substitutional D Pure The solid solution in which the solute atoms replace some of the solvent atoms is known as___________ solid solution 32 A Alloy C Interstitial B Substitutional D Pure Which of the following is the example of substitutional solid solution 33 A Steel C Brass B Bronze D All of the above Brass is the alloy of 34 A Copper and zinc C Copper and tin B Copper and lead D Copper and silver Bronze is the alloy of 35 A Copper and zinc C Copper and tin B Copper and lead D Copper and silver Pure metals are elements that consist of a single type of 36 A Atom C Protons B Electrons D Nucleus The percentage of carbon in steel varies from 37 A 0.08 to 2 C 0.008 to 2 B 0.8 to 2 D 2 to 6.67 The percentage of carbon in cast iron varies from 38 A 0.008 to 0.3 C 2 to 4 B 0.008 to 2 D 2 to 6.67 The eutectoid reaction on iron carbide diagram occurs _________ percent carbon 39 A 0.18 C 4.3 B 0.8 D 2.5 The peritectic reaction on iron carbide diagram occurs _________ percent carbon 40 A 0.18 C 4.3 B 0.8 D 2.5 The eutectic reaction on iron carbide diagram occurs at _________ percent carbon 41 A 0.18 C 4.3 B 0.8 D 2.5 The percentage of carbon in hypo eutectoid steel varies from 42 A 0.008 to 2 C 0.08 to 0.8 B 0.008 to 0.8 D 0.8 to 2 The percentage of carbon in hyper eutectoid steel varies from 43 A 0.008 to 2 C 0.08 to 0.8 B 0.8 to 6.67 D 0.8 to 2 The percentage of carbon in hypo eutectic cast iron varies from 44 A 0.8 to 2 C 2 to 4.3 B 2 to 3 D 4.3 to 6.67 The percentage of carbon in hyper eutectic cast iron varies from 45 A 0.8 to 2 C 2 to 4.3 B 2 to 3 D 4.3 to 6.67 In iron carbide equilibrium diagram the austenite is stable 46 A Only above 727 degree Celsius C Only below 727 degree Celsius B At room temperature D Only below 2 percent carbon In iron carbide equilibrium diagram cementite changes from ferromagnetic to paramagnetic at _________ degree Celsius temperature 47 A 727 C 768 B 210 D 1147 In iron carbide equilibrium diagram ferrite changes from ferromagnetic to paramagnetic at _________ degree Celsius temperature 48 A 727 C 768 B 210 D 1147 Page 3 of 4  Pearlite is the mixture of 49 A Cementite and austenite C Ferrite and austenite B Ferrite and cementite D Austenite and ledburite Ferrite has ___________ crystal structure 50 A Simple cubic C BCC B FCC D HCP Austenite has ___________ crystal structure 51 A Simple cubic C BCC B FCC D HCP Cementite has ___________ crystal structure 52 A Orthorhombic C BCC B FCC D HCP The eutectic mixture of Austenite and Cementite is known as 53 A Pearlite C Ledeburite B Steel D Cast iron In Brinell hardness test the indenter used has the ball diameter of 54 A 10 mm C 10 cm B 1 mm D 50 mm In Brinell hardness test for testing iron and steel the load applied is 55 A 500 kg C 500 gm B 3000 kg D 3000 gm In Brinell hardness test for testing nonferrous metals the load applied is 56 A 500 kg C 500 gm B 3000 kg D 3000 gm Brinell hardness test works on the principle of 57 A Load of indentation C Area of indentation B Depth of indentation D Place of indentation Rockwell hardness test works on the principle of 58 A Load of indentation C Area of indentation B Depth of indentation D Place of indentation In Rockwell hardness test the minor load applied is 59 A 5 kg C 60 kg B 8 kg D 10 kg In Rockwell hardness test the hardness number is 60 A Read directly from the dial C Displayed on the screen B Calculated by using formulae D Taken from the standard table In Rockwell hardness test the ball indenter uses _________ on dial 61 A Black numbers C Red numbers B Green numbers D White numbers In Rockwell hardness test the brale (diamond cone) indenter uses _________ on dial 62 A Black numbers C Red numbers B Green numbers D White numbers Page 4 of 4