MODULE 5

Question 1

12 MECHANICAL PROPERTIES

Answer 1

1. Strength
2. Hardness
3. Elasticity
4. Plasticity
5. Brittleness
6. Fatigue
7. Impact strength
8. Abrasion resistance
9. Creep
10. Ductility
11. Stiffness
12. Toughness

Question 2

resist failure caused by loads acting on it

Answer 2

STRENGTH

Question 3

resist scratching by harder body MOHS scale

Answer 3

HARDNESS

Question 4

regain its initial shape and size after removal of load

Answer 4

ELASTICITY

Question 5

permanent deformation without cracking

Answer 5

PLASTICITY

Question 6

subjected to load, if it fails suddenly without causing deformation is

Answer 6

BRITTLENESS

Question 7

repeated loads

Answer 7

FATIGUE

Question 8

sudden loads and will undergo some deformation without causing rupture

Answer 8

IMPACT STRENGTH

Question 9

loss of material due to rubbing particles while working is

Answer 9

ABRASION RESISTANCE

Question 10

deformation caused by constant loads for long periods

Answer 10

CREEP

Question 11

enables it to be drawn out or elongated to appreciable extent before rupture occurs

Answer 11

DUCTILITY

Question 12

enables to be twisted, bent or stretched under high stress

Answer 12

TOUGHNESS

Question 13

enables is to resist deformation

Answer 13

STIFFNESS

Question 14

2 CHEMICAL PROPERTIES

Answer 14

Chemical resistance and Corrosion resistance

Question 15

construction materials to resist the effects by chemicals like acids, salts, and alkalins

Answer 15

CHEMICAL RESISTANCE

Question 16

formation of rust (iron oxide) when they subjected to atmosphere is

Answer 16

CORROSION RESISTANCE

Question 17

conduct or to resist electricity through them are

Answer 17

ELECTRICAL PROPERTIES

Question 18

materials like permeability, hysteresis etc are req. in case of generators

Answer 18

MAGNETIC PROPERTIES

Question 19

OPTICAL

Answer 19

color, light reflection and light transmission

Question 20

ACOUSTICAL

Answer 20

sound absorption, transmission, and reflection