MTL 200 TEST 2
Al_2O_3-Cr_2O_3 - correct answer-an isomorphous phase diagram
Binary Isomorphous phase diagram contains - correct answer-a eutectoid reaction
Eutectic structure forms prior to the primary phase during cooling - correct answer-FALSE
Eutectoid reaction is an incongruent transformation - correct answer-TRUE
From a practical prespective, the addition of the network modifiers and intermediates in the
silica glasses is used to - correct answer-decrease the melting point and viscosity
In alloy systems, equilibrium can be defined as - correct answer-the state of a system
corresponding to the maximum free energy, where the phase characteristics remain constant
over definite time periods
In ceramic materials, anions are positively charged metallic ions - correct answer-False
In ceramic structures the coordination number of 6 for the cation corresponds to: - correct
answer-octahedron
In poly(vinyl chloride) (PVC) - correct answer-every fourth hydrogen atom in polyethylene is
replaced with a Cl atom
In the following reactions during equilibrium cooling (α,β,y stands for solid phases), which is
a eutectic reaction? - correct answer-L -> α + β
Non equilibrium cooling results in cored structure - correct answer-TRUE
Polyemer molecules may be characterized in terms of - correct answer-chemistry, size,
shape and structure
Solidus line normally represents the boundary between a liquid phase region and a two
phase region with the liquid [e.g, the boundary L/ (α+L) - correct answer-False
Solubility limit is the minimum concentration of solute that may be added without forming a
new phase - correct answer-False
The boiling temperature of the hydrocarbons in the paraffin family decreases with increasing
molecular weight - correct answer-False
The most common coordination numbers for ceramic materials are - correct answer-4, 6,
and 8
Al_2O_3-Cr_2O_3 - correct answer-an isomorphous phase diagram
Binary Isomorphous phase diagram contains - correct answer-a eutectoid reaction
Eutectic structure forms prior to the primary phase during cooling - correct answer-FALSE
Eutectoid reaction is an incongruent transformation - correct answer-TRUE
From a practical prespective, the addition of the network modifiers and intermediates in the
silica glasses is used to - correct answer-decrease the melting point and viscosity
In alloy systems, equilibrium can be defined as - correct answer-the state of a system
corresponding to the maximum free energy, where the phase characteristics remain constant
over definite time periods
In ceramic materials, anions are positively charged metallic ions - correct answer-False
In ceramic structures the coordination number of 6 for the cation corresponds to: - correct
answer-octahedron
In poly(vinyl chloride) (PVC) - correct answer-every fourth hydrogen atom in polyethylene is
replaced with a Cl atom
In the following reactions during equilibrium cooling (α,β,y stands for solid phases), which is
a eutectic reaction? - correct answer-L -> α + β
Non equilibrium cooling results in cored structure - correct answer-TRUE
Polyemer molecules may be characterized in terms of - correct answer-chemistry, size,
shape and structure
Solidus line normally represents the boundary between a liquid phase region and a two
phase region with the liquid [e.g, the boundary L/ (α+L) - correct answer-False
Solubility limit is the minimum concentration of solute that may be added without forming a
new phase - correct answer-False
The boiling temperature of the hydrocarbons in the paraffin family decreases with increasing
molecular weight - correct answer-False
The most common coordination numbers for ceramic materials are - correct answer-4, 6,
and 8
