Question 1

What is a phase equilibrium diagram?

Accepted Answer

A graphic relationship between temperature and weight ratios of elements and alloys

Answer

A diagram showing the relationship between temperature and pressure

Answer

A diagram showing the relationship between time and temperature

Answer

A diagram showing the relationship between pressure and volume

Question 2

What is a phase in an alloy?

Accepted Answer

A uniform part of an alloy with a certain chemical composition and structure

Answer

A non-uniform part of an alloy

Answer

A part of an alloy that is always in the liquid state

Answer

A mixture of different alloys

Question 3

Which of the following is an example of a phase in a salt-water solution?

Accepted Answer

All of the above

Answer

Crystals of ice

Answer

Water vapor

Answer

Liquid salt solution

Question 4

What is an alloy?

Accepted Answer

A mixture of elements, typically with a base metal and small amounts of additives

Answer

A type of ceramic material

Answer

A pure metal

Answer

A non-metallic compound

Question 5

Which of the following is an example of an alloy?

Accepted Answer

All of the above

Answer

Aluminum alloys

Answer

Steel

Answer

Bronze

Question 6

What is a binary alloy system?

Accepted Answer

An alloy system with two metals

Answer

An alloy system with three metals

Answer

An alloy system with more than four metals

Answer

An alloy system with four metals

Question 7

What is a ternary alloy system?

Accepted Answer

An alloy system with three metals

Answer

An alloy system with four metals

Answer

An alloy system with more than four metals

Answer

An alloy system with two metals

Question 8

What is a multi-system alloy?

Accepted Answer

An alloy system with three or more metals

Answer

An alloy system with three metals

Answer

An alloy system with four metals

Answer

An alloy system with two metals

Question 9

Which of the following is a type of binary alloy system?

Accepted Answer

All of the above

Answer

Simple eutectic type

Answer

Combination type

Answer

Solid solution type

Question 10

What is a simple eutectic type binary alloy system?

Accepted Answer

The two components are soluble in each other in the liquid state but are completely insoluble in the solid state

Answer

The two components are completely soluble in the liquid state but only partially soluble in the solid state

Answer

The two components are completely insoluble in both the liquid and solid states

Answer

The two components are completely soluble in each other in both the liquid and solid states

Question 11

What is a solid solution type binary alloy system?

Accepted Answer

The two components are completely soluble in each other in both the liquid and solid states

Answer

The two components are completely insoluble in both the liquid and solid states

Answer

The two components are completely soluble in the liquid state but only partially soluble in the solid state

Answer

The two components are soluble in each other in the liquid state but are completely insoluble in the solid state

Question 12

What is a combination type binary alloy system?

Accepted Answer

The two components are completely soluble in the liquid state but only partially soluble in the solid state

Answer

The two components are soluble in each other in the liquid state but are completely insoluble in the solid state

Answer

The two components are completely insoluble in both the liquid and solid states

Answer

The two components are completely soluble in each other in both the liquid and solid states

Question 13

What is the eutectic point in a phase equilibrium diagram?

Accepted Answer

The point where solidification commences at a minimum temperature

Answer

The point where solidification is complete at a minimum temperature

Answer

The point where solidification is complete at a maximum temperature

Answer

The point where solidification commences at a maximum temperature

Question 14

What is the eutectic temperature?

Accepted Answer

The temperature at which solidification commences at a minimum temperature

Answer

The temperature at which solidification commences at a maximum temperature

Answer

The temperature at which solidification is complete at a minimum temperature

Answer

The temperature at which solidification is complete at a maximum temperature

Question 15

What is the eutectic composition?

Accepted Answer

The composition at which solidification commences at a minimum temperature

Answer

The composition at which solidification commences at a maximum temperature

Answer

The composition at which solidification is complete at a minimum temperature

Answer

The composition at which solidification is complete at a maximum temperature

Question 16

What is a substitutional solid solution?

Accepted Answer

A solid solution where atoms of the solute element replace atoms of the solvent metal

Answer

A solid solution where atoms of the solute element are completely insoluble in the solvent metal

Answer

A solid solution where atoms of the solute element are located in the spaces between atoms of the solvent metal

Answer

A solid solution where atoms of the solute element form a separate phase

Question 17

What is an interstitial solid solution?

Accepted Answer

A solid solution where atoms of the solute element are located in the spaces between atoms of the solvent metal

Answer

A solid solution where atoms of the solute element form a separate phase

Answer

A solid solution where atoms of the solute element replace atoms of the solvent metal

Answer

A solid solution where atoms of the solute element are completely insoluble in the solvent metal

Question 18

What is the primary effect of forming a solid solution on an alloy?

Accepted Answer

Increase in electrical resistance and mechanical strength

Answer

Decrease in hardness

Answer

Increase in plasticity

Answer

Decrease in electrical resistance and mechanical strength

Question 19

What is the phase equilibrium diagram for copper-nickel alloys?

Accepted Answer

A solid solution type

Answer

A multi-system type

Answer

A simple eutectic type

Answer

A combination type

Question 20

What is the combination type phase equilibrium diagram?

Accepted Answer

A diagram where two components are completely soluble in the liquid state but only partially soluble in the solid state

Answer

A diagram where two components are completely soluble in both the liquid and solid states

Answer

A diagram where two components are completely soluble in the liquid state but completely insoluble in the solid state

Answer

A diagram where two components are completely insoluble in both the liquid and solid states

Question 21

What is the Iron-Carbon phase diagram?

Accepted Answer

A diagram that describes the Iron-Carbon system of alloys

Answer

A diagram that describes the Aluminum-Copper system of alloys

Answer

A diagram that describes the Zinc-Magnesium system of alloys

Answer

A diagram that describes the Copper-Nickel system of alloys

Question 22

What is the maximum carbon content in the Iron-Carbon phase diagram?

Accepted Answer

6.67%

Answer

4.30%

Answer

8.00%

Answer

2.06%

Question 23

What is the crystal structure of δ-ferrite?

Accepted Answer

Body-Centered Cubic (BCC)

Answer

Face-Centered Cubic (FCC)

Answer

Simple Cubic

Answer

Hexagonal Close-Packed (HCP)

Question 24

What is the crystal structure of austenite?

Accepted Answer

Face-Centered Cubic (FCC)

Answer

Hexagonal Close-Packed (HCP)

Answer

Body-Centered Cubic (BCC)

Answer

Simple Cubic

Question 25

What is the maximum carbon concentration in austenite at 1147°C?

Accepted Answer

2.06%

Answer

4.30%

Answer

0.09%

Answer

0.83%

Question 26

What is the maximum carbon concentration in α-ferrite at 723°C?

Accepted Answer

0.25%

Answer

2.06%

Answer

0.83%

Answer

0.09%

Question 27

What is cementite?

Accepted Answer

An inter-metallic compound with the composition Fe3C

Answer

A type of ferrite

Answer

A type of austenite

Answer

A solid solution of carbon in iron

Question 28

What is the eutectoid concentration of carbon in the Iron-Carbon phase diagram?

Accepted Answer

0.83%

Answer

0.09%

Answer

2.06%

Answer

0.25%

Question 29

What is the eutectoid transformation temperature in the Iron-Carbon phase diagram?

Accepted Answer

723°C

Answer

1147°C

Answer

2097°C

Answer

1493°C

Question 30

What is the upper critical temperature (point A3) in the Iron-Carbon phase diagram?

Accepted Answer

The temperature below which ferrite starts to form from austenite

Answer

The temperature below which austenite does not exist

Answer

The temperature of the eutectoid transformation

Answer

The temperature below which cementite starts to form from austenite

Question 31

What is the lower critical temperature (point A1) in the Iron-Carbon phase diagram?

Accepted Answer

The temperature of the eutectoid transformation

Answer

The temperature below which austenite does not exist

Answer

The temperature below which ferrite starts to form from austenite

Answer

The temperature below which cementite starts to form from austenite

Question 32

What is the magnetic transformation temperature (point A2) in the Iron-Carbon phase diagram?

Accepted Answer

The temperature below which α-ferrite is ferromagnetic

Answer

The temperature below which austenite is ferromagnetic

Answer

The temperature below which cementite is ferromagnetic

Answer

The temperature below which δ-ferrite is ferromagnetic

Question 33

What is the primary phase in hypo-eutectoid steels at room temperature?

Accepted Answer

Primary ferrite and pearlite

Answer

Primary cementite and pearlite

Answer

Austenite and pearlite

Answer

Cementite and ledeburite

Question 34

What is the primary phase in eutectoid steel at room temperature?

Accepted Answer

Pearlite only

Answer

Cementite and ledeburite

Answer

Primary cementite and pearlite

Answer

Primary ferrite and pearlite

Question 35

What is the primary phase in hyper-eutectoid steels at room temperature?

Accepted Answer

Primary cementite and pearlite

Answer

Cementite and ledeburite

Answer

Pearlite only

Answer

Primary ferrite and pearlite

Question 36

What is the primary phase in cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Primary ferrite and pearlite

Answer

Primary cementite and pearlite

Answer

Pearlite only

Question 37

What is the peritectic transformation in the Iron-Carbon phase diagram?

Accepted Answer

The transformation of δ-ferrite and liquid phase into austenite

Answer

The transformation of α-ferrite into cementite

Answer

The transformation of cementite into ledeburite

Answer

The transformation of austenite into pearlite

Question 38

What is the eutectic transformation in the Iron-Carbon phase diagram?

Accepted Answer

The transformation of liquid phase into austenite and cementite

Answer

The transformation of δ-ferrite and liquid phase into austenite

Answer

The transformation of α-ferrite into cementite

Answer

The transformation of austenite into pearlite

Question 39

What is the eutectoid transformation in the Iron-Carbon phase diagram?

Accepted Answer

The transformation of austenite into pearlite

Answer

The transformation of α-ferrite into cementite

Answer

The transformation of liquid phase into austenite and cementite

Answer

The transformation of δ-ferrite and liquid phase into austenite

Question 40

What is the primary phase in hypo-eutectic cast irons at room temperature?

Accepted Answer

Primary austenite and ledeburite

Answer

Pearlite only

Answer

Primary cementite and pearlite

Answer

Cementite and ledeburite

Question 41

What is the primary phase in hyper-eutectic cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Primary cementite and pearlite

Answer

Pearlite only

Answer

Primary austenite and ledeburite

Question 42

What is the primary phase in eutectic cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Pearlite only

Answer

Primary cementite and pearlite

Answer

Primary austenite and ledeburite

Question 43

What is the primary phase in hypo-eutectoid steels at room temperature?

Accepted Answer

Primary ferrite and pearlite

Answer

Pearlite only

Answer

Cementite and ledeburite

Answer

Primary cementite and pearlite

Question 44

What is the primary phase in hyper-eutectoid steels at room temperature?

Accepted Answer

Primary cementite and pearlite

Answer

Pearlite only

Answer

Primary ferrite and pearlite

Answer

Cementite and ledeburite

Question 45

What is the primary phase in eutectoid steels at room temperature?

Accepted Answer

Pearlite only

Answer

Primary ferrite and pearlite

Answer

Primary cementite and pearlite

Answer

Cementite and ledeburite

Question 46

What is the primary phase in cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Primary ferrite and pearlite

Answer

Primary cementite and pearlite

Answer

Pearlite only

Question 47

What is the primary phase in hypo-eutectic cast irons at room temperature?

Accepted Answer

Primary austenite and ledeburite

Answer

Cementite and ledeburite

Answer

Primary cementite and pearlite

Answer

Pearlite only

Question 48

What is the primary phase in hyper-eutectic cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Primary austenite and ledeburite

Answer

Pearlite only

Answer

Primary cementite and pearlite

Question 49

What is the primary phase in eutectic cast irons at room temperature?

Accepted Answer

Cementite and ledeburite

Answer

Primary austenite and ledeburite

Answer

Pearlite only

Answer

Primary cementite and pearlite

Question 50

What is the primary phase in hypo-eutectoid steels at room temperature?

Accepted Answer

Primary ferrite and pearlite

Answer

Pearlite only

Answer

Cementite and ledeburite

Answer

Primary cementite and pearlite

Question 51

What is the primary phase in hyper-eutectoid steels at room temperature?

Accepted Answer

Primary cementite and pearlite

Answer

Pearlite only

Answer

Cementite and ledeburite

Answer

Primary ferrite and pearlite

Question 52

What is the primary phase in eutectoid steels at room temperature?

Accepted Answer

Pearlite only

Answer

Primary cementite and pearlite

Answer

Cementite and ledeburite

Answer

Primary ferrite and pearlite

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