Material Science - Engineering Materials

Indicate, if following statements are True or False

1. It is possible to ascertain the value of Young’s modulus of elasticity from the results of a tensile test.
2. Toughness depends upon the ductility of a material.
3. Higher the value of modulus of elasticity for a material, higher is its stiffness.
4. The hardness in steel is basically due to presence of cementite.
5. The tensile strength of cast iron is as good as that of mild steel.
6. Nickel-silvers are alloys of Nickel and silver.
7. The red-hardness is high speed steel is due to addition of chromium in such steels.
8. Many stainless steels cannot be hardened by heat treatment process.
9. Tempering is the reverse of hardening.
10. Aluminium bronze contains copper, tin and aluminium.

Answers
    1. T     2. T     3. T     4. T     5. F
    6. F     7. F     8. T     9. T     10. F

Comments

Post a Comment

Popular posts from this blog

Electrical Machines (D.C. Generators)

1. The basic requirement of a d.c. armature winding is that it must be (a) a closed one (b) a lap winding (c) a wave winding (d) either (b) or (c) 2. A wave winding must go at least ............ around the armature before it closes back where it started. (a) once (b) twice (c) thrice (d) four times 3. The d.c. armature winding in which coil sides are a pole pitch apart is called ............ winding. (a) multiplex (b) fractional-pitch (c) full-pitch (d) pole-pitch 4. For making coil span equal to a pole pitch in the armature winding of a d.c. generator, the back pitch of the winding must equal the number of (a) commutator bars per pole (b) winding elements (c) armature conductors per path (d) armature parallel paths. 5. The primary reason for making the coil span of a d.c. armature winding equal to a pole pitch is to (a) obtain a coil span of 180º (electrical) (b) ensure the addition of e.m.fs. of consecutive turns (c) distribute
Read more

Material Science Quiz (Mechanical Properties of Metals)

1. Time dependent permanent deformation is called ________________. (a) Plastic deformation (b) Elastic deformation (c) Creep (d) Anelastic deformation 2. Figure-out the odd point in the following (a) Proportinal limit (b) Elastic limit (c) Yeild point (d) Fracture point 3. If a material is subjected to two incremental true strains namely ε1 and ε2, then the total true strain is (a) ε1 * ε2 (b) ε1 - ε2 (c) ε1 + ε2 (d) ε1 / ε2 4. Engineering stress-strain curve and True stress-strain curve are equal up to (a) Proportional limit (b) Elastic limit (c) Yeild point (d) Tensile strength point 5. Value of Poisson’s ratio for ionic solids in the range of (a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4 6. Hydrostatic stress results in the following (a) Linear strain (b) Shear strain (c) Both linear and shear strains (d) None 7. High elastic modulus in materials arises from (a) High strength of bonds (b) Weak bonds (c) combination of bonds (d) None 8. Change in elastic modulus for ordinar
Read more

Material Science Quiz (Failure)

1. Failure due to excessive deformation is controlled by ______________. (a) Material properties (b) Design & Dimensions (c) Both (d) None 2. Failure due to excessive deformation is controlled by ______________. (a) Yield strength (b) Tensile strength (c) Young’s modulus (d) All 3. Time dependent yield is known as (a) Fracture (b) Fatigue (c) Buckling (d) Creep 4. Cleavage fracture appears (a) Bright (b) Dull (c) Difficult to identify (d) None 5. Usually materials with following crystal structure fail in ductile mode (a) FCC (b) BCC (c) HCP (d) None 6. Brittle fracture is more dangerous than ductile fracture because _______________. (a) No warning sign (b) Crack propagates at very high speeds (c) No need for extra stress during crack propagation (d) All 7. Fracture voids usually form at (a) Inclusions (b) Second phase particles (c) Grain boundary triple points (d) All 8. Fracture stress (σf) is proportional to (a) crack length (b) 1/crack length (c) (crac
Read more