ME383 Test 1_Metals
Solid solution alloying is the principal strengthening mechanism in high-strength low-alloy (HSLA) steels: (a) true or (b) false.
Answer. (a)
The strength and hardness of steel increases as carbon content increases: (a) true of (b) false.
Answer. (a)
Which of the following elements is the most important alloying ingredient in steel? (a) carbon, (b) chromium, (c) nickel, (d) molybdenum, or (e) vanadium.
Answer. (a)
Which of the metallic elements is the most abundant on the earth? (a) aluminum, (b) copper, (c) iron, (d) magnesium, or (e) silicon.
Answer. (a)
From which of the following ores is aluminum derived? (a) alumina, (b) bauxite, (c) cementite, (d) hematite, or (e) scheelite.
Answer. (b)
Plain carbon steels are designated in the AISI code system by which of the following? (a) 01XX, (b) 10XX, (c) 11XX, (d) 12XX, or (e) 30XX.
Answer. (b)
Which of the following is the most important cast iron commercially? (a) ductile cast iron, (b) gray cast iron, (c) malleable iron, or (d) white cast iron.
Answer. (b)
Which of the following metals has the lowest density? (a) aluminum, (b) magnesium, (c) tin, or (d) titanium.
Answer. (b)
A steel with 1.0% carbon is known as which of the following: (a) eutectoid, (b) hypoeutectoid, (c) hypereutectoid, or (d) wrought iron.
Answer. (c)
Which of the following metals has the highest density? (a) gold, (b) lead, (c) platinum, (d) silver, or (e) tungsten.
Answer. (c)
The predominant phase in the iron-carbon alloy system for a composition with 99% Fe at room temperature is which of the following? (a) austenite, (b) cementite, (c) delta, (d) ferrite, or (e) gamma.
Answer. (d)
Which of the following has the lowest melting point? (a) aluminum, (b) lead, (c) magnesium, (d) tin, or (e) zinc.
Answer. (d)
Which of the following is not a common alloying ingredient in steel? (a) chromium, (b) manganese, (c) nickel, (d) vanadium, (e) zinc.
Answer. (e)