TRUE/FALSE

Question 1

During the drying process of ceramic products, there is a shrinkage of about 10-20% occuring

Answer 1

TRUE

Question 2

Composites are formed by a matrix phase and a reinforcement phase. The reinforcement phase protects the matrix phase and distributes the load to the reinforcement phase

Answer 2

TRUE

Question 3

In general, a metal (ex: steel) has a larger toughness than a ceramic material (ex: cement)

Answer 3

TRUE

Question 4

The movement of dislocation is responsible for elastic deformation in ceramics

Answer 4

FALSE
Dislocation in PLASTIC

Question 5

It is not recommende to use gypsum plaster for finishing outsite walls exposed to the environment

Answer 5

TRUE

Question 6

The sequence of the following material is correctly ordered from the highest to the lowest thermal conductivity
1. Aluminium oxide
2. Copper
3. Polyethylene

Answer 6

TRUE

Question 7

Sustainability is a system problem and must be tackle according to the 3P approach: Planet, People, Prosperity

Answer 7

TRUE

Question 8

Wood is a sustainable material and has a great advantage of being mechanically resistant to compression and tension reaching a yield strength of 500MPa

Answer 8

FALSE

Question 9

In ceramic materials, sintering occurs during firing at a temperature of about 3/4 of the melting temperature of the ceramic constituents

Answer 9

TRUE

Question 10

Gypsum plaster is obtained from gypsum rock crashed and treated at 500C. Then the dried powder is mixed with some quartz powder to obtain the final plaster

Answer 10

FALSE
It is mixed with WATER

Question 11

Glasses can be tempered to gain flexural strength

Answer 11

TRUE?

Question 12

We need to build a house on a soil that has a high quantity of sulphates in it. For the foundations it is recommended to emply a concrete containing a cement with high content of blast furnace slag rather than a standard cement

Answer 12

TRUE

Question 13

The sequence of the following material is correctly ordered from the highest to the lowest tensile strength
1. Silicone
2. Stainless steel
3. Tempered glass

Answer 13

TRUE

Question 14

Stainless steel is an iron-carbon alloy (Fe-C) with the mandatory addition of at least 20% of Titanium

Answer 14

FALSE
It’s CHROMIUM not Titanium

Question 15

For temperature higher than the glass transition temperature (T>Tg), glasses have a pure elastic behavior and it’s subjected to brittle fracture

Answer 15

FALSE
(T>Tg): VICIOUS BEHAVIOUR
(T<Tg): ELASTIC BEHAVIOUR

Question 16

Thermosetting polymers dont have a glass transition temperature

Answer 16

FALSE

Question 17

Speaking about polymers, what is the meaning of “PS”? It is a polymer:
a. Thermoplastic
b. Thermoset -
c. Partially crystalline
d. Obtained using only hydrogen and carbon atoms

Answer 17

a. FALSE (TP)
b. FALSE (TS)
c. FALSE
d. TRUE (PS: POLYSTYRENE)

Question 18

Which are the main characteristics of metal?
a. Ductility
b. Brittleness
c. Electrical conductivity
d. Thermal conductivity

Answer 18

a. TRUE
b. TRUE
c. FALSE
d. FALSE

Question 19

Stainless steels
a. Must have C > 12%
b. Are showing better corrosion resistance than CORTEN steel
c. Cannot be used for anti seismic application
d. Are showing bettter elongation than carbon steels

Answer 19

a. FALSE (depends on types)
b. TRUE
c. FALSE
d. TRUE (stainless: 45%; carbon: 25%)

Question 20

What is strain hardening
a. A thermal treatment made at temperature higher than melting
b. A treatment to improve plastic deformation of a given steel
c. A process that changes microstructure to the material
d. A mechanical treatment to increase the strength of a metal

Answer 20

a. FALSE
b. TRUE
c. FALSE
d. TRUE

• Strain hardening is a phenomenon whereby a ductile metal becomes harder and stronger as it is plastically deformed. It is also called work hardening or cold work
• Strain hardening is often utilized commercially to enhance the mechanical properties of metals during fabrication procedures

Question 21

The plastic deformation into a material
a. Occurs for materials which are breaking in a brittle way
b. Never occurs for metals and polymers
c. Is done to increase the properties of ceramics
d. Is due to movement of dislocations into the material

Answer 21

a. FALSE
b. FALSE (Metals have plastic deformation)
c. TRUE
d. FALSE

Question 22

In the hot rolling of steels
a. The slabs are heated up to temperature of 2000C before the rolling
b. Thickness lower than 2mm can be reached
c. The final product is usually mechanically reinforced with polymer coating
d. Is a preferred technique to obtain stainless steel sheets

Answer 22

a. FALSE (1250C)
b. FALSE (30mm)
c. TRUE
d. FALSE (for steel in general)

Question 23

LIME
a. Are divided into air or hydraulic
b. Provide the carbonation with a very fast reaction
c. When not properly hydrated cause cracks and defects in the finished wall
d. Can be reinforced with magnesium oxide to increase mechanical properties and firing times

Answer 23

a. TRUE
b. FALSE (it’s a slow process)
c. TRUE
d. FALSE

Question 24

Accelerating admixtures in cements
a. Are used in hot weather conditions
b. Can lead to the corrosion of steels
c. Improve strength developments
d. Make use of thermoplastic polymers

Answer 24

a. FALSE (Cold weather)
b. FALSE (added for improving cement’s properties)
c. TRUE
d. FALSE

Question 25

Sustainable development
a. Is a problem that only concerns material’s extraction
b. Is a system’s problem
c. Is based on the respect of the three capitals: manufactured, natural and human capitals
d. Is concerned only about the shareholders’ income

Answer 25

a. FALSE
b. TRUE
c. TRUE
d. FALSE

Question 26

It is recommended to use gypsum plaster for finishing outside wall exposed to the environment for its thermal insulation properties

Answer 26

FALSE
CANNOT use for external wall

Question 27

The curves in the graph represents the test of three different material A, B, and C. From the graph we can say that the elastic modulus A is higher elastic modulus of B

Answer 27

FALSE
A is more brittle than B