Exam 3 Multiple Choice

Which one of the following is the correct formula for computing the splitting tensile strength from a splitting tensile strength test? a. 2p/πld b. 2πP/ld c. P/2πld d. πP/2ld

a. 2p/πld

if a concrete has an ultimate flexural strength of 650 psi, which is the endurance limit in the flexure likely to be? a. 325 b. 450 c. 300 d. 130

a. 325

which of the following is the correct formula for computing the flexural strength from a beam test using center point loading? a. 3PL/2bd^2 b. PL/bd^2 c. P/db d. 2P/πLd

a. 3PL/2bd^2

What ate the typical tensile strength and elastic modulus of the plastic ABS a. 6,000 and 300,000 psi b. 6,000 and 3,000,000 psi c. 1,000 and 100,000 psi d. 1,000 and 3,000,000 psi

a. 6,000 and 300,000 psi

what are the typical tensile strength and elastic modulus of the plastic acrylonitrile-butadiene-styrene (ABS) a. 6,000 and 300,000 psi b. 6,000 and 1,000,000 psi c. 1,000 and 300,000 psi d. 1,000 and 1,000,000 psi

a. 6,000 and 300,000 psi

What are the typical tensile strength and elastic modulus of the plastic PMMA ( or plexiglass) a. 8,000 and 300,000 psi b. 8,000 and 1,000,000 psi c. 1,000 and 100,00 psi d. 1,000 and 1,000,000 psi

a. 8,000 and 300,000 psi

what are the typical tensile strength and elastic modulus of PMMA? a. 8,000 and 350,000 psi b. 8,000 and 3,500,000 psi c. 800 and 350,000 psi d. 800 and 3,500,000 psi

a. 8,000 and 350,000 psi

the first commercial plastic is a. bakelite b. plexiglass c. fiberglass d. PVC

a. bakelite

the most important alloying element used in stainless steel is a. chromium b. copper c. zinc d. tungsten

a. chromium

Which one of the following methods is not effective in controlling the corrosion of steel structures? a. passivation b. paint coating c. galvanizing d. impressed current cathodic protection

a. passivation

which of the following methods is NOT effective in reducing the corrosion rate of steel? a. passivation b. organic coating c. impressed current cathodic protection d. sacrificial anode

a. passivation

which if the following statements is NOT TRUE concerning the difference between plastics and concrete? a. plastics generally have a lower coefficient of thermal expansion than concrete b. plastics generally have a higher tensile strength than concrete c. plastics generally have a lower elastic modulus to tensile strength ratio than concrete d. plastics generally have a higher ductility than concrete

a. plastics generally have a lower coefficient of thermal expansion than concrete

which one of the following statements is TRUE concerning the different between plastics and concrete? a. plastics generally have a lower elastic modulus than concrete b. plastic generally have a lower tensile strength than concrete c. plastics generally have a lower coefficient of thermal expansion than concrete d. plastics generally have a lower ductility than concrete

a. plastics generally have a lower elastic modulus than concrete

what is the main purpose of adding anti-oxidant to plastic? a. to reduce the rate of hardening with time of the plastic b. to make plastic more flexible c. to make the plastic more fire resistance d. to increase the harness of the plastic

a. to reduce the rate of hardening with time of the plastic

which of the following alloying elements is the most commonly used in making cutting-tool steel? a. tungsten b. nickel c. molybdenum d. chromium

a. tungsten

which one of the following is true concerning the effects of work hardening on steel a. work hardening increases the hardness b. work hardening increases the toughness c. work hardening reduces the yield strength d. work hardening increases the ductility

a. work hardening increases the hardness

brass is an alloy of copper and a. zinc b. nickle c. tin d. aluminum

a. zinc

what is the basic difference between usages of the brinell and Rockwell harness tests> a. brinell test is run on structural steel, while Rockwell tests is run on high-strength steel b. brinell test requires a larger test specimen c. results from the brinell test can be used to estimate the ultimate strength of a metal, white it cannot be done using the Rockwell test d. brinell test results are more reliable Tham the Rockwell test results

b. brinell test requires a larger test specimen

Which one of the following is the main function of limestone in the blast-furnace process in the production of iron? a. it acts as fuel b. it acts as a fluxing agent to get rid of impurities such as sulfer in the iron ore c. it reduces the required temperature needed in the blast-furnace process d. it provides the part of the iron produced

b. it acts as a fluxing agent to get rid of impurities such as sulfer in the iron ore

which of the following is a function of limestone in the production of iron in the blast-furnace process? a. it provides additional fuel b. it helps get rid of impurities such as sulfur in the iron ore c. it reduces the temperature needed in the blast furnace process d. it provides additional iron

b. it helps get rid of impurities such as sulfur in the iron ore

what is the main effect of adding antioxidant to plastics? a. it increases the flame resistance b. it reduces the rate of hardening (or oxidation) c. it increases the toughness d. it decreases the ductility

b. it reduces the rate of hardening (or oxidation)

what is the competition of AISI 1040 Steel? a. stainless steel with 0.4% carbon b. plain carbon steel with 0.4% carbon c. plain carbon steel with 1.04% carbon d. nickel alloy steel with 0.4% carbon

b. plain carbon steel with 0.4% carbon

The main purpose of adding plasticizer to plastics is a. to reduce the rate of hardening due to heat or UV light b. to increase flexibility c. to increase strength d. to increase fire resistance

b. to increase flexibility

What is the most common usage of zinc in steel structures? a. to increase the toughness of steel b. to protect steel from corrosion c. to increase the harness of steel d. to make steel easier to be welded on

b. to protect steel from corrosion

what condition(s) much be satisfied in a thermal stress analysis a. deformations must be compatible b. forces must be in equilibrium c. deformations must be compatible, and forces must be in equilibrium d. the computed tensile stresses must be equal to the computed compressive strength in magnitude

c. deformations must be compatible, and forces must be in equilibrium

What can the results of the brinenell and Rockwell test be used for, besides indication of hardness of the metals tested? a. estimation of toughness b. estimation of ductility c. estimation of ultimate strength d. estimation of elastic modulus

c. estimation of ultimate strength

which of the following statements is NOT true regarding the effects of carbon content on the properties of steel? a. high carbon content gives Hugh yield strength b. high carbon content gives high brinell hardness number c. high carbon content gives high ductility d. high carbon content gives high ultimate strength

c. high carbon content gives high ductility

Which one of the following statements is not true regarding the characteristics of AISI 1045 Steel? a. it is a plain carbon steel b. it has elastic modulus of 29,000,000 psi c. it has carbon content of 4.5% d. it has a specific gravity of 7.9

c. it has carbon content of 4.5%

which one of the following statements is not true concerning the differences between plastics and concrete? a. plastics generally have a higher coefficient of thermal expansion than concrete b. plastics generally have a higher tensile strength than concrete c. plastics generally have a higher elastic modulus to tensile strength ratio than concrete d. plastics generally have a higher ductility than concrete

c. plastics generally have a higher elastic modulus to tensile strength ratio than concrete

Which one of the following statement is NOT True concerning the differences between plastics and concrete? a. plastics generally have a lower elastic modulus than concrete b. plastics generally have a higher tensile strength that concrete c. plastics generally have a lower coefficient of thermal expansion than concrete d. plastics generally have a lower density than concrete

c. plastics generally have a lower coefficient of thermal expansion than concrete

Which one of the following statements is true concerning the differences between plastics and metals? a. plastics have a higher elastic modulus to strength ratio than metals b. plastics have a lower coefficient of thermal expansion c. plastics have a higher creep deformation under load d. plastics have higher electric conductivity

c. plastics have a higher creep deformation under load

Which one of the following ferrous metals has the lowest percentage of carbon in it? a. gray cast iron b. white cast iron c. wrought iron d. high strength steel

c. wrought iron

Which one of the following is not a main raw material for the production of iron int he blast-furnace process? a. limestone b. iron ore c. coke d. blast-furnace slag

d. blast-furnace slag

Which one of the following alloying elements is used to make stainless steel? a. manganese b. nickel c. molybdenum d. chromium

d. chromium

which of the following metals has the highest amount of carbon in it? a. structural steel b. wrought iron c. high-strength steel d. gray cast iron

d. gray cast iron

what are the function(s) of coke in the blast-furnace process in the production of iron? a. provides energy b. provides carbon monoxide c. provides CaO and energy d. provides both energy and carbon monoxide

d. provides both energy and carbon monoxide

Which of the following statements is true regarding the effects of work hardening on properties of steel? a. work hardening decreases the yield strength b. work hardening decreases the brinell hardness number c. work hardening increases the ductility d. work hardening decreases the toughness

d. work hardening decreases the toughness

Which one of the following statements is not true regarding the effects of work hardening on properties of steel? a. work hardening increases the yield strength b. work hardening increases the brinell hardness number c. work hardnening decreases the ductility d. work hardening increases the toughness

d. work hardening increases the toughness