Question 1

What is corrosion?

Accepted Answer

The slow but continuous eating away of metallic components by chemical or electrochemical attack

Answer

The process of painting metals to protect them

Answer

The process of heating metals to improve their strength

Answer

The rapid oxidation of metals

Question 2

Which of the following factors govern corrosion?

Accepted Answer

The metal, protective treatment, and environment

Answer

The temperature, humidity, and pressure

Answer

The weight, density, and volume of the component

Answer

The color, shape, and size of the component

Question 3

What is dry corrosion?

Accepted Answer

The direct oxidation of metals when a freshly cut surface reacts with atmospheric oxygen

Answer

Corrosion that occurs in the presence of water

Answer

Corrosion caused by acid rain

Answer

Corrosion that occurs when two dissimilar metals are in contact

Question 4

What is wet corrosion?

Accepted Answer

Corrosion caused by the oxidation of metals in the presence of air and moisture

Answer

Corrosion caused by high temperatures

Answer

Corrosion caused by mechanical stress

Answer

Corrosion that occurs in the absence of moisture

Question 5

What is galvanic corrosion?

Accepted Answer

Corrosion that occurs when two dissimilar metals are in intimate contact in the presence of an electrolyte

Answer

Corrosion caused by high temperatures

Answer

Corrosion caused by acid rain

Answer

Corrosion caused by mechanical stress

Question 6

Which of the following is an example of atmospheric corrosion?

Accepted Answer

Rusting of ferrous metals

Answer

Corrosion caused by high temperatures

Answer

Corrosion caused by mechanical stress

Answer

Corrosion caused by acid rain

Question 7

What is stress corrosion?

Accepted Answer

Corrosion caused by the combined effects of chemical corrosion and mechanical stress

Answer

Corrosion caused by the presence of moisture

Answer

Corrosion caused by acid rain

Answer

Corrosion caused by high temperatures

Question 8

What is corrosion fatigue?

Accepted Answer

Corrosion caused by alternating stresses in a corrosive environment

Answer

Corrosion caused by the presence of moisture

Answer

Corrosion caused by acid rain

Answer

Corrosion caused by high temperatures

Question 9

What is fretting corrosion?

Accepted Answer

Corrosion caused by vibrational stresses in closely fitting machine parts

Answer

Corrosion caused by the presence of moisture

Answer

Corrosion caused by high temperatures

Answer

Corrosion caused by acid rain

Question 10

What is impingement corrosion?

Accepted Answer

Corrosion caused by the combined effects of mechanical abrasion and chemical corrosion

Answer

Corrosion caused by acid rain

Answer

Corrosion caused by high temperatures

Answer

Corrosion caused by the presence of moisture

Question 11

Which of the following is a factor affecting corrosion?

Accepted Answer

Structural design

Answer

Shape of the component

Answer

Color of the metal

Answer

Weight of the component

Question 12

What is the role of the environment in corrosion?

Accepted Answer

It determines the rate and type of corrosion

Answer

It has no effect on corrosion

Answer

It only affects the color of the metal

Answer

It only affects the weight of the metal

Question 13

How do applied or internal stresses affect corrosion?

Accepted Answer

They intensify chemical and electrochemical corrosion

Answer

They only affect the color of the metal

Answer

They have no effect on corrosion

Answer

They reduce the rate of corrosion

Question 14

What is the effect of temperature on corrosion?

Accepted Answer

Corrosion is retarded or stopped at low temperatures

Answer

Corrosion only occurs at high temperatures

Answer

Corrosion is faster at low temperatures

Answer

Corrosion is unaffected by temperature

Question 15

Which of the following metals resist corrosion?

Accepted Answer

Copper, zinc, aluminum, lead, stainless steel, nickel, and chromium

Answer

Iron, steel, and magnesium

Answer

Gold and silver only

Answer

Sodium and potassium

Question 16

What is the purpose of protective coatings in corrosion prevention?

Accepted Answer

To insulate the metallic surface from the corrosive medium

Answer

To increase the weight of the metal

Answer

To increase the temperature of the metal

Answer

To change the color of the metal

Question 17

What is cladding?

Accepted Answer

A process of sandwiching the basis metal between pieces of coating metal and rolling it to the required thickness

Answer

A process of painting metals

Answer

A process of cooling metals to reduce corrosion

Answer

A process of heating metals to improve their strength

Question 18

What is hot-dip metal coating?

Accepted Answer

A process of dipping articles into a bath of molten metal

Answer

A process of painting metals

Answer

A process of cooling metals to reduce corrosion

Answer

A process of heating metals to improve their strength

Question 19

What is electro-plating?

Accepted Answer

A process of forming metal coatings by electro-deposition

Answer

A process of heating metals to improve their strength

Answer

A process of painting metals

Answer

A process of cooling metals to reduce corrosion

Question 20

What is anodizing?

Accepted Answer

An electrolytic process for thickening the natural oxide film on aluminum

Answer

A process of heating metals to improve their strength

Answer

A process of cooling metals to reduce corrosion

Answer

A process of painting metals

Question 21

What is phosphating?

Accepted Answer

A process of producing a phosphate coating on the surface of steel or zinc-base alloys

Answer

A process of heating metals to improve their strength

Answer

A process of painting metals

Answer

A process of cooling metals to reduce corrosion

Question 22

What is chromating?

Accepted Answer

A process of producing chromate coatings on magnesium-base alloys, zinc, and its alloys

Answer

A process of heating metals to improve their strength

Answer

A process of cooling metals to reduce corrosion

Answer

A process of painting metals

Question 23

What is cathodic protection?

Accepted Answer

A method of protecting buried or submerged structures by making them act as a cathode

Answer

A process of cooling metals to reduce corrosion

Answer

A process of painting metals

Answer

A process of heating metals to improve their strength

Question 24

What is the primary purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To increase hardness

Answer

To refine grain structure

Answer

To improve ductility

Question 25

What is the typical temperature range for stress-relief annealing?

Accepted Answer

500-600°C

Answer

650-700°C

Answer

900-950°C

Answer

750-800°C

Question 26

What is the main advantage of spheroidised annealing?

Accepted Answer

It produces a soft, tough condition

Answer

It refines grain structure

Answer

It increases hardness

Answer

It improves ductility

Question 27

What is the main disadvantage of spheroidised annealing?

Accepted Answer

It is expensive

Answer

It reduces hardness

Answer

It is time-consuming

Answer

It increases brittleness

Question 28

What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To increase hardness

Answer

To refine grain structure

Answer

To improve ductility

Question 29

What is the main disadvantage of full annealing?

Accepted Answer

It is expensive

Answer

It increases brittleness

Answer

It reduces hardness

Answer

It is time-consuming

Question 30

What is the main purpose of normalizing?

Accepted Answer

To refine grain structure

Answer

To reduce weight

Answer

To improve ductility

Answer

To increase hardness

Question 31

What is the main advantage of normalizing over full annealing?

Accepted Answer

It is cheaper

Answer

It improves ductility

Answer

It reduces brittleness

Answer

It produces a softer material

Question 32

What is the main purpose of hardening?

Accepted Answer

To increase hardness

Answer

To refine grain structure

Answer

To reduce weight

Answer

To improve ductility

Question 33

What is the main disadvantage of hardened steel?

Accepted Answer

It is too brittle

Answer

It is too soft

Answer

It is too lightweight

Answer

It is too ductile

Question 34

What is the main purpose of tempering?

Accepted Answer

To reduce brittleness

Answer

To increase hardness

Answer

To refine grain structure

Answer

To improve ductility

Question 35

What is the main advantage of tempering?

Accepted Answer

It reduces brittleness

Answer

It refines grain structure

Answer

It increases hardness

Answer

It improves ductility

Question 36

What is the main disadvantage of tempering?

Accepted Answer

It reduces hardness

Answer

It increases weight

Answer

It reduces ductility

Answer

It increases brittleness

Question 37

What is the typical quenching medium used for tempering?

Accepted Answer

All of the above

Answer

Air

Answer

Water

Answer

Oil

Question 38

What is the main purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To improve ductility

Answer

To refine grain structure

Answer

To increase hardness

Question 39

What is the typical temperature range for stress-relief annealing?

Accepted Answer

500-600°C

Answer

900-950°C

Answer

750-800°C

Answer

650-700°C

Question 40

What is the main advantage of spheroidised annealing?

Accepted Answer

It produces a soft, tough condition

Answer

It refines grain structure

Answer

It increases hardness

Answer

It improves ductility

Question 41

What is the main disadvantage of spheroidised annealing?

Accepted Answer

It is expensive

Answer

It is time-consuming

Answer

It reduces hardness

Answer

It increases brittleness

Question 42

What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To refine grain structure

Answer

To increase hardness

Answer

To improve ductility

Question 43

What is the main disadvantage of full annealing?

Accepted Answer

It is expensive

Answer

It is time-consuming

Answer

It increases brittleness

Answer

It reduces hardness

Question 44

What is the main purpose of normalizing?

Accepted Answer

To refine grain structure

Answer

To reduce weight

Answer

To increase hardness

Answer

To improve ductility

Question 45

What is the main advantage of normalizing over full annealing?

Accepted Answer

It is cheaper

Answer

It improves ductility

Answer

It reduces brittleness

Answer

It produces a softer material

Question 46

What is the main purpose of hardening?

Accepted Answer

To increase hardness

Answer

To improve ductility

Answer

To refine grain structure

Answer

To reduce weight

Question 47

What is the main disadvantage of hardened steel?

Accepted Answer

It is too brittle

Answer

It is too lightweight

Answer

It is too ductile

Answer

It is too soft

Question 48

What is the main purpose of tempering?

Accepted Answer

To reduce brittleness

Answer

To increase hardness

Answer

To improve ductility

Answer

To refine grain structure

Question 49

What is the main advantage of tempering?

Accepted Answer

It reduces brittleness

Answer

It refines grain structure

Answer

It increases hardness

Answer

It improves ductility

Question 50

What is the main disadvantage of tempering?

Accepted Answer

It reduces hardness

Answer

It increases brittleness

Answer

It increases weight

Answer

It reduces ductility

Question 51

What is the typical quenching medium used for tempering?

Accepted Answer

All of the above

Answer

Air

Answer

Water

Answer

Oil

Question 52

What is the main purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To increase hardness

Answer

To improve ductility

Answer

To refine grain structure

Question 53

What is the typical temperature range for stress-relief annealing?

Accepted Answer

500-600°C

Answer

650-700°C

Answer

750-800°C

Answer

900-950°C

Question 54

What is the main advantage of spheroidised annealing?

Accepted Answer

It produces a soft, tough condition

Answer

It increases hardness

Answer

It refines grain structure

Answer

It improves ductility

Question 55

What is the main disadvantage of spheroidised annealing?

Accepted Answer

It is expensive

Answer

It increases brittleness

Answer

It is time-consuming

Answer

It reduces hardness

Question 56

What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To refine grain structure

Answer

To increase hardness

Answer

To improve ductility

Question 57

What is the main disadvantage of full annealing?

Accepted Answer

It is expensive

Answer

It reduces hardness

Answer

It increases brittleness

Answer

It is time-consuming

Question 58

What is the main purpose of normalizing?

Accepted Answer

To refine grain structure

Answer

To improve ductility

Answer

To reduce weight

Answer

To increase hardness

Question 59

What is the main advantage of normalizing over full annealing?

Accepted Answer

It is cheaper

Answer

It improves ductility

Answer

It produces a softer material

Answer

It reduces brittleness

Question 60

What is the main purpose of hardening?

Accepted Answer

To increase hardness

Answer

To reduce weight

Answer

To improve ductility

Answer

To refine grain structure

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