What is the chief ore of zinc?
ACassiterite
BBauxite
CSphalerite
DIlmanite
ESAS · Question Bank
Engineering Materials
203 questions · page 8 of 11. Answer in your head first, then check the solution.
What is the chief ore of titanium?
ASphalerite
BIlmanite
CBauxite
DCassiterite
What is the mixture of gibbsite and diaspore, of which aluminum is derived?
ABauxite
BRutile
CGalena
DSphalerite
The term "brass" is very commonly used to designate any alloy primarily of:
Acopper and zinc
Baluminum and iron
Ccopper and aluminum
Dzinc and nickel
The term "bronze" is used to designate any alloy containing:
Acopper and zinc
Bcopper and aluminum
Ccopper and nickel
Dcopper and tin
In a system of designating wrought aluminum alloys, a four digit number is used. What does the first digit indicates?
AThe purity of aluminum
BThe identity of the alloy
CThe alloy group
DThe strength of the alloy
In a system of designating wrought aluminum alloys, what does the second digit represents?
AThe purity of aluminum
BThe identity of the alloy
CThe modifications of the alloy group or impurity limits
DThe alloy group
The ff alloys are the chief alloys that are die-cast except:
AZinc alloys
BMagnesium alloys
CManganese alloys
DAluminum alloys
In the system of designating wrought aluminum alloys, the letter F that follows the number indicates what condition of the alloy?
AAs fabricated
BStrain hardened
CAnnealed
DArtificially aged
What is the minimum tensile strength of Gray Cast Iron class 50?
A25000 lbf/in²
B35000 lbf/in²
C50000 lbf/in²
D100000 lbf/in²
What is the carbon content of wrought iron?
Aless than 0.1 %
Bexactly 1%
Cmore than 1%
Dranges from 0.1 to 0.2%
Alnico is an alloy containing how many percent nickel?
A10 %
B14 %
C18 %
D22 %
The most common beta brass with a composition of 60% copper and 40% zinc is called _______
Ayellow brass
Bred brass
CMuntz metal
Dwhite brass
Red brass contains about how many percent of zinc?
A10 %
B15 %
C20 %
D25 %
Yellow brass contains approximately how many percent of zinc?
A20 %
B50 %
C30 %
D40 %
Indicate the false statement
AAluminum bronzes contain no tin
BSilicon bronzes are usually used for marine application and high strength fasteners
CBronze is a copper-tin alloy
DTin is relatively soluble in copper
What is the most abundant metal in nature?
AAluminum
BSteel
CIron
DCopper
Indicate the false statement about aluminum
AIt has 1/3 the weight of steel
BIt has 1/3 the stiffness of steel
CIt has high strength-to-weight ratio
DIt has poor thermal and electrical conductivity
What is the effect to aluminum with iron as the alloying element?
AReduce hot-cracking tendencies in casting
BImprove conductivity
CLowers castability
DImproves machinability
What is the effect to aluminum with copper as alloying element?
AIncreases strength up to about 12 %
BReduces shrinkage
CImproves machinability
DIncreases fluidity in casting