Question 1

What is the primary purpose of heat treatment in carbon steels?

Accepted Answer

To vary mechanical properties

Answer

To reduce weight

Answer

To improve corrosion resistance

Answer

To increase electrical conductivity

Question 2

Which of the following is NOT a heat-treatment process for carbon steels?

Accepted Answer

Galvanizing

Answer

Normalizing

Answer

Annealing

Answer

Hardening

Question 3

What determines the ultimate structure and properties of steel during heat treatment?

Accepted Answer

The rate of cooling

Answer

The type of furnace used

Answer

The rate of heating

Answer

The initial carbon content

Question 4

Which heat treatment process is used to render steel soft and ductile?

Accepted Answer

Annealing

Answer

Tempering

Answer

Hardening

Answer

Normalizing

Question 5

What is the temperature range for stress-relief annealing?

Accepted Answer

550-600°C

Answer

700-800°C

Answer

300-400°C

Answer

900-1000°C

Question 6

Which annealing process is used for cold-worked low carbon steel?

Accepted Answer

Stress-relief annealing

Answer

Full annealing

Answer

Normalizing

Answer

Spheroidised annealing

Question 7

What is the temperature range for spheroidised annealing?

Accepted Answer

650-700°C

Answer

750-800°C

Answer

500-600°C

Answer

900-950°C

Question 8

What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To improve corrosion resistance

Answer

To reduce weight

Answer

To increase hardness

Question 9

What is the typical temperature range for full annealing?

Accepted Answer

30-50°C above the upper critical temperature

Answer

200-250°C above the upper critical temperature

Answer

100-150°C above the upper critical temperature

Answer

300-350°C above the upper critical temperature

Question 10

What structure is produced by full annealing?

Accepted Answer

Coarse Pearlite

Answer

Fine Pearlite

Answer

Martensite

Answer

Troostite

Question 11

What is the main disadvantage of full annealing?

Accepted Answer

It is expensive

Answer

It reduces hardness

Answer

It is time-consuming

Answer

It increases brittleness

Question 12

What is the primary purpose of normalizing?

Accepted Answer

To refine grain structure

Answer

To improve ductility

Answer

To increase hardness

Answer

To reduce weight

Question 13

How is cooling achieved in the normalizing process?

Accepted Answer

By cooling in free air

Answer

By cooling in water

Answer

By cooling in a furnace

Answer

By cooling in oil

Question 14

What is the typical temperature range for normalizing?

Accepted Answer

30-50°C above the upper critical temperature

Answer

100-150°C above the upper critical temperature

Answer

300-350°C above the upper critical temperature

Answer

200-250°C above the upper critical temperature

Question 15

What structure is produced by normalizing?

Accepted Answer

Fine Pearlite

Answer

Coarse Pearlite

Answer

Troostite

Answer

Martensite

Question 16

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 17

What is the primary purpose of hardening?

Accepted Answer

To increase hardness

Answer

To refine grain structure

Answer

To reduce weight

Answer

To improve ductility

Question 18

What is the fastest quenching medium used for hardening?

Accepted Answer

Water

Answer

Sand

Answer

Air

Answer

Oil

Question 19

What is the temperature range for hardening hyper-eutectoid steels?

Accepted Answer

30-50°C above the upper critical temperature

Answer

200-250°C above the upper critical temperature

Answer

100-150°C above the upper critical temperature

Answer

300-350°C above the upper critical temperature

Question 20

What is the main disadvantage of hardened steel?

Accepted Answer

It is too brittle

Answer

It is too ductile

Answer

It is too soft

Answer

It is too lightweight

Question 21

What is the primary purpose of tempering?

Accepted Answer

To reduce brittleness

Answer

To refine grain structure

Answer

To increase hardness

Answer

To improve ductility

Question 22

What is the typical temperature range for tempering?

Accepted Answer

200-400°C

Answer

400-600°C

Answer

Below 200°C

Answer

Above 600°C

Question 23

What structure is produced by tempering below 200°C?

Accepted Answer

Martensite

Answer

Sorbite

Answer

Pearlite

Answer

Troostite

Question 24

What structure is produced by tempering above 400°C?

Accepted Answer

Sorbite

Answer

Pearlite

Answer

Martensite

Answer

Troostite

Question 25

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 26

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 27

What is the typical quenching medium used for tempering?

Accepted Answer

All of the above

Answer

Oil

Answer

Air

Answer

Water

Question 28

What is the main purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To refine grain structure

Answer

To improve ductility

Answer

To increase hardness

Question 29

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 30

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 31

What is the main disadvantage of spheroidised annealing?

Accepted Answer

It is expensive

Answer

It is time-consuming

Answer

It increases brittleness

Answer

It reduces hardness

Question 32

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 33

What is the main disadvantage of full annealing?

Accepted Answer

It is expensive

Answer

It reduces hardness

Answer

It is time-consuming

Answer

It increases brittleness

Question 34

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 35

What is the main advantage of normalizing over full annealing?

Accepted Answer

It is cheaper

Answer

It produces a softer material

Answer

It reduces brittleness

Answer

It improves ductility

Question 36

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 37

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 38

What is the main purpose of tempering?

Accepted Answer

To reduce brittleness

Answer

To improve ductility

Answer

To increase hardness

Answer

To refine grain structure

Question 39

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 40

What is the main disadvantage of tempering?

Accepted Answer

It reduces hardness

Answer

It increases weight

Answer

It increases brittleness

Answer

It reduces ductility

Question 41

What is the typical quenching medium used for tempering?

Accepted Answer

All of the above

Answer

Water

Answer

Air

Answer

Oil

Question 42

What is the main purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To refine grain structure

Answer

To increase hardness

Answer

To improve ductility

Question 43

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 44

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 45

What is the main disadvantage of spheroidised annealing?

Accepted Answer

It is expensive

Answer

It is time-consuming

Answer

It increases brittleness

Answer

It reduces hardness

Question 46

46. What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To improve ductility

Answer

To increase hardness

Answer

To refine grain structure

Question 47

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 48

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 49

What is the main advantage of normalizing over full annealing?

Accepted Answer

It is cheaper

Answer

It reduces brittleness

Answer

It improves ductility

Answer

It produces a softer material

Question 50

What is the main purpose of hardening?

Accepted Answer

To increase hardness

Answer

To reduce weight

Answer

To refine grain structure

Answer

To improve ductility

Question 51

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 52

What is the main purpose of tempering?

Accepted Answer

To reduce brittleness

Answer

To refine grain structure

Answer

To improve ductility

Answer

To increase hardness

Question 53

What is the main advantage of tempering?

Accepted Answer

It reduces brittleness

Answer

It increases hardness

Answer

It improves ductility

Answer

It refines grain structure

Question 54

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 55

What is the typical quenching medium used for tempering?

Accepted Answer

All of the above

Answer

Water

Answer

Air

Answer

Oil

Question 56

What is the main purpose of stress-relief annealing?

Accepted Answer

To reduce internal stresses

Answer

To refine grain structure

Answer

To increase hardness

Answer

To improve ductility

Question 57

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 58

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 59

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 60

What is the main purpose of full annealing?

Accepted Answer

To produce the softest possible condition

Answer

To refine grain structure

Answer

To improve ductility

Answer

To increase hardness

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