WorksheetsUnderstanding Heat Treatment of Metals
Total questions: 15
Worksheet time: 5mins
Which of the following is NOT a type of heat treatment process for metals?
Annealing
Quenching
Electroplating
Tempering
What is the main purpose of annealing in metals?
To increase hardness
To relieve internal stresses and improve ductility
To make the metal magnetic
To increase brittleness
Which heat treatment process involves heating a metal and then rapidly cooling it in water or oil?
Tempering
Quenching
Case hardening
Normalising
What is the effect of tempering on quenched steel?
Increases brittleness
Reduces hardness and increases toughness
Makes it non-magnetic
Increases corrosion resistance
Which of the following is a common application of case hardening?
Making railway tracks
Manufacturing gears and camshafts
Producing aluminium cans
Creating copper wires
Cold working of metals is performed at which temperature range?
Above the metal’s recrystallisation temperature
Below the metal’s recrystallisation temperature
At the melting point
At 100°C
Which of the following is NOT an effect of heat treatment on metal properties?
Change in hardness
Change in ductility
Change in colour
Change in toughness
What is the main difference between normalising and annealing?
Annealing uses faster cooling than normalising
Normalising uses air cooling, annealing uses slow furnace cooling
Normalising is only for non-ferrous metals
Annealing increases hardness, normalising decreases it
Which process is used to harden only the surface of a metal component while keeping the core soft?
Tempering
Case hardening
Annealing
Cold working
What is the typical temperature range (in Celsius) for tempering steel?
100–250°C
250–650°C
700–900°C
0–100°C
Which of the following is a benefit of cold working metals?
Increases ductility
Increases strength and hardness
Reduces electrical conductivity
Increases grain size
Why is quenching often followed by tempering?
To increase brittleness
To reduce internal stresses and improve toughness
To make the metal magnetic
To increase corrosion
Which of the following is NOT a typical application of heat-treated metals in engineering?
Cutting tools
Structural beams
Food packaging
Springs
What is the main purpose of case hardening?
To harden the entire metal uniformly
To harden the surface while keeping the core tough
To make the metal non-magnetic
To increase electrical conductivity
Which of the following is a common annealing technique?
Carburising
Full annealing
Nitriding
Spheroidising
