ENGR-250 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) ALREADY GRADED A+
Stress at fracture from a bend test is ......................... Ans✓✓✓flexural
strength
A compound of metallic and nonmetallic elements for which the
interatomic bonding range from 100% covalent to 100% ionic is
a............................ Ans✓✓✓ceramic
Which of the following is NOT ceramic processing/fabricating
technique? Ans✓✓✓Sand casting
The Al2O3 - Cr2O3 phase diagram is a Ans✓✓✓binary isomorphous
phase diagram
On the basis of ionic radii of Fe2+ (0.077 nm) and O2- (0.140 nm), what
crystal structure would you predict for FeO? Ans✓✓✓AX (coordination
number 6)
The most common coordination numbers of ceramic materials are:
Ans✓✓✓4, 6, and 8
The cation-anion radius ratio of a certain AX-type compound is 0.550.
The coordination number of the cation is........................ Ans✓✓✓6
,The number of atomic or ionic neighbors is the ...............................
Ans✓✓✓coordination number
A fabrication technique that involves the compaction of powdered metal
followed by heat treatment to produce a dense piece is
called...................... Ans✓✓✓powder metallurgy or powder processing
The element that is NOT the primary constituent of nonferrous alloys is
Ans✓✓✓Iron
Which of the following is NOT a forming operation? Ans✓✓✓Casting
Which of the following is a copper-based alloy? Ans✓✓✓Bronze
The composition of a certain alloy is 0.12 wt.% Cu, 1.2 wt.% Mn, 0.1
wt.% Zn, and balance Al. This alloy is a/an ..............................
Ans✓✓✓Aluminum-based alloy
A heat treatment in which a material is exposed to an elevated
temperature for an extended time period and then slowly cooled is
......................... Ans✓✓✓Annealing
Which of the following phases is/are typically found in a low-carbon
steel at the room temperature? Ans✓✓✓Both ferrite and pearlite
, Which of the following is a light metal? Ans✓✓✓Aluminum
The characteristics that distinguish the stainless steel from other steel
types is: Ans✓✓✓they are more corrosion resistant
A reaction in which, upon cooling, a liquid phase transforms
isothermally and reversibly into two intimately mixed solid phases is
............................. Ans✓✓✓eutectic reaction
Which of the following is FALSE about a one-component system?
Ans✓✓✓The number of constituents must be only ONE
........................is a form of failure that occurs in structures subjected to
dynamic and fluctuating stresses Ans✓✓✓Fatigue
Fatigue limit is also called.......................... Ans✓✓✓Endurance limit
Separation of a body into two or more pieces in response to an imposed
stress is..................... Ans✓✓✓Fracture
Which type of fracture is associated with intergranular crack
propagation? Ans✓✓✓brittle
(VERIFIED ANSWERS) ALREADY GRADED A+
Stress at fracture from a bend test is ......................... Ans✓✓✓flexural
strength
A compound of metallic and nonmetallic elements for which the
interatomic bonding range from 100% covalent to 100% ionic is
a............................ Ans✓✓✓ceramic
Which of the following is NOT ceramic processing/fabricating
technique? Ans✓✓✓Sand casting
The Al2O3 - Cr2O3 phase diagram is a Ans✓✓✓binary isomorphous
phase diagram
On the basis of ionic radii of Fe2+ (0.077 nm) and O2- (0.140 nm), what
crystal structure would you predict for FeO? Ans✓✓✓AX (coordination
number 6)
The most common coordination numbers of ceramic materials are:
Ans✓✓✓4, 6, and 8
The cation-anion radius ratio of a certain AX-type compound is 0.550.
The coordination number of the cation is........................ Ans✓✓✓6
,The number of atomic or ionic neighbors is the ...............................
Ans✓✓✓coordination number
A fabrication technique that involves the compaction of powdered metal
followed by heat treatment to produce a dense piece is
called...................... Ans✓✓✓powder metallurgy or powder processing
The element that is NOT the primary constituent of nonferrous alloys is
Ans✓✓✓Iron
Which of the following is NOT a forming operation? Ans✓✓✓Casting
Which of the following is a copper-based alloy? Ans✓✓✓Bronze
The composition of a certain alloy is 0.12 wt.% Cu, 1.2 wt.% Mn, 0.1
wt.% Zn, and balance Al. This alloy is a/an ..............................
Ans✓✓✓Aluminum-based alloy
A heat treatment in which a material is exposed to an elevated
temperature for an extended time period and then slowly cooled is
......................... Ans✓✓✓Annealing
Which of the following phases is/are typically found in a low-carbon
steel at the room temperature? Ans✓✓✓Both ferrite and pearlite
, Which of the following is a light metal? Ans✓✓✓Aluminum
The characteristics that distinguish the stainless steel from other steel
types is: Ans✓✓✓they are more corrosion resistant
A reaction in which, upon cooling, a liquid phase transforms
isothermally and reversibly into two intimately mixed solid phases is
............................. Ans✓✓✓eutectic reaction
Which of the following is FALSE about a one-component system?
Ans✓✓✓The number of constituents must be only ONE
........................is a form of failure that occurs in structures subjected to
dynamic and fluctuating stresses Ans✓✓✓Fatigue
Fatigue limit is also called.......................... Ans✓✓✓Endurance limit
Separation of a body into two or more pieces in response to an imposed
stress is..................... Ans✓✓✓Fracture
Which type of fracture is associated with intergranular crack
propagation? Ans✓✓✓brittle
