3A1 (questions with complete solutions)
graded A+ passed
Covalent bonding occurs when: - correct answer ✔✔Electrons are shared between atoms
Ionic compounds are formed by the: - correct answer ✔✔Transferring of electrons between the atoms
Corrosion is defined as the: - correct answer ✔✔Destruction of a metal by chemical or electrochemical
reaction with it's environment
Alloy steel is a steel that has other elements added to it which tend to increase it's strength, ductility,
and resistance to: - correct answer ✔✔Corrosion
Define Oxidation - correct answer ✔✔When an element loses or gives up electrons
Galvanic Corrosion - correct answer ✔✔Occurs when two different metals are immersed ina common
electrolyte and there is a connecting path between the two metals which allows an electric current to
flow
Hydrogen Embrittlement - correct answer ✔✔Hydrogen Embrittlement Hydrogen atoms diffuse into the
steel and collect between the metal atoms decreasing the materials ductility
Hydrogen Stress Cracking - correct answer ✔✔Hydrogen interacts with the metal to induce crack growth
which may lead to fracture
Hydrogen Blistering - correct answer ✔✔Hydrogen atoms may diffuse into voids where there is room for
more than one atom and form molecular hydrogen. The build of pressure can cause fissures and blisters
in the steel
,Caustic Corrosion - correct answer ✔✔Takes place when corrosion products are deposited and the
concentration of sodium hydroxide increases by wick boiling
Corrosion increases as the pH of the environment - correct answer ✔✔Decreases
A higher level of oxygen will lead to - correct answer ✔✔Accelerated corrosion
Cathodic protection always uses: - correct answer ✔✔Direct current over varying rates
In galvanic corrosion, the material that corrodes or looses its ions is the: - correct answer ✔✔Anode or
Material that is less noble
The first layer of an absorbed film type of corrosion inhibitor is: - correct answer ✔✔Strongly bonded to
the metal surface
Stray currents can be found by: - correct answer ✔✔Measuring voltage drops and current flows along
buried structures and metal pipelines
Corrosion Coupons are: - correct answer ✔✔Pieces of metal inserted in a system to evaluate the
corrosiveness of the system
Caustic corrosion is a name given to corrosion that occurs beneath a concentrated buildup of sodium: -
correct answer ✔✔Hydroxide
Hydrogen Blistering is one form of hydrogen induced corrosion that is caused by: - correct answer
✔✔Atomic hydrogen diffusion into very small irregularities in the steel and joining together and lifting
up the surface of the steel
The operation of a blast furnace is most efficient when it is: - correct answer ✔✔Continuous
What is produced in a blast furnace? - correct answer ✔✔Pig Iron
, What is the purpose of a blast furnace? - correct answer ✔✔To reduce iron oxides into molten iron by
creating carbon monoxide that will steal an oxygen from the iron oxides to create carbon dioxide and
leave the solution
Roughly what temperature is reached in a blast furnace? - correct answer ✔✔1600C
What is the carbon content of iron made in a cupola furnace? - correct answer ✔✔2%-4%
Specialty steels for construction of bridges, boilers and ships are refined in an oxygen furnace because: -
correct answer ✔✔This method reduces impurities and gives the steel greater strength
Malleable cast iron is produced by - correct answer ✔✔Giving white cast iron castings a long heat
treatment at about 925C followed by slow cooling
Cold working or welding of steel tends to develop unequal internal stresses that should be relieved by: -
correct answer ✔✔Heat treating, Stress Relieving, Annealing
In white cast iron, the carbon in the iron is: - correct answer ✔✔Chemically combined in the form of iron
carbide or cementite
A special type of alloy steel used for tool making is called: - correct answer ✔✔High speed steel
Malleable cast iron is produced by - correct answer ✔✔Giving white cast iron castings a long heat
treatment at about 925C followed by slow cooling
Non-ferrous Metals - correct answer ✔✔do not have iron as their main constituent
Define Reduction - correct answer ✔✔When an element gains electrons
Define Hardness - correct answer ✔✔A material's resistance to wear, abrasion and penetration
graded A+ passed
Covalent bonding occurs when: - correct answer ✔✔Electrons are shared between atoms
Ionic compounds are formed by the: - correct answer ✔✔Transferring of electrons between the atoms
Corrosion is defined as the: - correct answer ✔✔Destruction of a metal by chemical or electrochemical
reaction with it's environment
Alloy steel is a steel that has other elements added to it which tend to increase it's strength, ductility,
and resistance to: - correct answer ✔✔Corrosion
Define Oxidation - correct answer ✔✔When an element loses or gives up electrons
Galvanic Corrosion - correct answer ✔✔Occurs when two different metals are immersed ina common
electrolyte and there is a connecting path between the two metals which allows an electric current to
flow
Hydrogen Embrittlement - correct answer ✔✔Hydrogen Embrittlement Hydrogen atoms diffuse into the
steel and collect between the metal atoms decreasing the materials ductility
Hydrogen Stress Cracking - correct answer ✔✔Hydrogen interacts with the metal to induce crack growth
which may lead to fracture
Hydrogen Blistering - correct answer ✔✔Hydrogen atoms may diffuse into voids where there is room for
more than one atom and form molecular hydrogen. The build of pressure can cause fissures and blisters
in the steel
,Caustic Corrosion - correct answer ✔✔Takes place when corrosion products are deposited and the
concentration of sodium hydroxide increases by wick boiling
Corrosion increases as the pH of the environment - correct answer ✔✔Decreases
A higher level of oxygen will lead to - correct answer ✔✔Accelerated corrosion
Cathodic protection always uses: - correct answer ✔✔Direct current over varying rates
In galvanic corrosion, the material that corrodes or looses its ions is the: - correct answer ✔✔Anode or
Material that is less noble
The first layer of an absorbed film type of corrosion inhibitor is: - correct answer ✔✔Strongly bonded to
the metal surface
Stray currents can be found by: - correct answer ✔✔Measuring voltage drops and current flows along
buried structures and metal pipelines
Corrosion Coupons are: - correct answer ✔✔Pieces of metal inserted in a system to evaluate the
corrosiveness of the system
Caustic corrosion is a name given to corrosion that occurs beneath a concentrated buildup of sodium: -
correct answer ✔✔Hydroxide
Hydrogen Blistering is one form of hydrogen induced corrosion that is caused by: - correct answer
✔✔Atomic hydrogen diffusion into very small irregularities in the steel and joining together and lifting
up the surface of the steel
The operation of a blast furnace is most efficient when it is: - correct answer ✔✔Continuous
What is produced in a blast furnace? - correct answer ✔✔Pig Iron
, What is the purpose of a blast furnace? - correct answer ✔✔To reduce iron oxides into molten iron by
creating carbon monoxide that will steal an oxygen from the iron oxides to create carbon dioxide and
leave the solution
Roughly what temperature is reached in a blast furnace? - correct answer ✔✔1600C
What is the carbon content of iron made in a cupola furnace? - correct answer ✔✔2%-4%
Specialty steels for construction of bridges, boilers and ships are refined in an oxygen furnace because: -
correct answer ✔✔This method reduces impurities and gives the steel greater strength
Malleable cast iron is produced by - correct answer ✔✔Giving white cast iron castings a long heat
treatment at about 925C followed by slow cooling
Cold working or welding of steel tends to develop unequal internal stresses that should be relieved by: -
correct answer ✔✔Heat treating, Stress Relieving, Annealing
In white cast iron, the carbon in the iron is: - correct answer ✔✔Chemically combined in the form of iron
carbide or cementite
A special type of alloy steel used for tool making is called: - correct answer ✔✔High speed steel
Malleable cast iron is produced by - correct answer ✔✔Giving white cast iron castings a long heat
treatment at about 925C followed by slow cooling
Non-ferrous Metals - correct answer ✔✔do not have iron as their main constituent
Define Reduction - correct answer ✔✔When an element gains electrons
Define Hardness - correct answer ✔✔A material's resistance to wear, abrasion and penetration
