BMST TEST EXAM QUESTIONS AND ANSWERS
Full name for plaster and mineral? - CORRECT ANSWER✅✅✅Plaster of Paris, sulfate
gypsum
Chemical notation for plaster? - CORRECT ANSWER✅✅✅2CaSO4H2O
What is the compression strength of plaster? - CORRECT ANSWER✅✅✅5000 - 18000 psi
What is a negative cast made from? - CORRECT ANSWER✅✅✅Plaster bandage or scotch
cast
What is a positive cast made from? - CORRECT ANSWER✅✅✅Plaster
What should be done once the negative cast and the positive cast are created? - CORRECT
ANSWER✅✅✅Name of the patient should be placed on both.
What is the temperature of the drying oven? - CORRECT ANSWER✅✅✅125-150 °F
How long will it take to dry a positive cast? - CORRECT ANSWER✅✅✅1-8 hours
What are the most common metals used in P&O? - CORRECT ANSWER✅✅✅Steel &
aluminum
What is steel made from? - CORRECT ANSWER✅✅✅Iron ore & carbon
Traits of carbon steel? - CORRECT ANSWER✅✅✅Used for cutting tools & structural
supports
Lower carbon content: ↑ductility ↓strength
High carbon content: ↓ductility ↑strength
, Tempering: ↓ductility ↑strength
Traits of low-alloy steel? - CORRECT ANSWER✅✅✅Completely dependent on the alloy.
Traits of high-alloy steel? - CORRECT ANSWER✅✅✅Up to 50% of alloy
More corrosion resistant
Stronger than carbon steel & low-alloy steel
Can be treated to obtain high strength-to-weight ratios
Suited for large, repetitive loads
More costly
Traits of stainless steel? - CORRECT ANSWER✅✅✅Considered high-alloy steel
Optimum corrosion resistance
10.5-11% iron chromium or iron-nickel-chromium
Types of alloys? - CORRECT ANSWER✅✅✅Carbon, manganese, nickel, chromium,
molybdenum, vanadium,silicon, boron.
Traits of aluminum - CORRECT ANSWER✅✅✅Low density
Moderately corrosion resistant
Relatively high strength
3rd most abundant
Sheds corrosive layer
Damaged by bodily fluids
Avoid direct skin-to-aluminum contact
AKA casting aluminum or wrought aluminum
What is casting aluminum? - CORRECT ANSWER✅✅✅heated until it becomes liquid
Full name for plaster and mineral? - CORRECT ANSWER✅✅✅Plaster of Paris, sulfate
gypsum
Chemical notation for plaster? - CORRECT ANSWER✅✅✅2CaSO4H2O
What is the compression strength of plaster? - CORRECT ANSWER✅✅✅5000 - 18000 psi
What is a negative cast made from? - CORRECT ANSWER✅✅✅Plaster bandage or scotch
cast
What is a positive cast made from? - CORRECT ANSWER✅✅✅Plaster
What should be done once the negative cast and the positive cast are created? - CORRECT
ANSWER✅✅✅Name of the patient should be placed on both.
What is the temperature of the drying oven? - CORRECT ANSWER✅✅✅125-150 °F
How long will it take to dry a positive cast? - CORRECT ANSWER✅✅✅1-8 hours
What are the most common metals used in P&O? - CORRECT ANSWER✅✅✅Steel &
aluminum
What is steel made from? - CORRECT ANSWER✅✅✅Iron ore & carbon
Traits of carbon steel? - CORRECT ANSWER✅✅✅Used for cutting tools & structural
supports
Lower carbon content: ↑ductility ↓strength
High carbon content: ↓ductility ↑strength
, Tempering: ↓ductility ↑strength
Traits of low-alloy steel? - CORRECT ANSWER✅✅✅Completely dependent on the alloy.
Traits of high-alloy steel? - CORRECT ANSWER✅✅✅Up to 50% of alloy
More corrosion resistant
Stronger than carbon steel & low-alloy steel
Can be treated to obtain high strength-to-weight ratios
Suited for large, repetitive loads
More costly
Traits of stainless steel? - CORRECT ANSWER✅✅✅Considered high-alloy steel
Optimum corrosion resistance
10.5-11% iron chromium or iron-nickel-chromium
Types of alloys? - CORRECT ANSWER✅✅✅Carbon, manganese, nickel, chromium,
molybdenum, vanadium,silicon, boron.
Traits of aluminum - CORRECT ANSWER✅✅✅Low density
Moderately corrosion resistant
Relatively high strength
3rd most abundant
Sheds corrosive layer
Damaged by bodily fluids
Avoid direct skin-to-aluminum contact
AKA casting aluminum or wrought aluminum
What is casting aluminum? - CORRECT ANSWER✅✅✅heated until it becomes liquid
