METALLURGICAL TECHNICIAN PRACTICE
EXAM Questions With Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of heat treatment in metals?
A. Increase color
B. Reduce weight
C. Improve mechanical properties
D. Increase electrical resistance
Rationale: Heat treatment modifies structure to improve strength,
hardness, ductility, or toughness.
2. Which process involves heating steel and then cooling it slowly in
air?
A. Quenching
B. Tempering
C. Normalizing
D. Carburizing
Rationale: Normalizing refines grain structure by air cooling after
heating above critical temperature.
3. What is the main component of steel?
,A. Copper
B. Aluminum
C. Nickel
D. Iron
Rationale: Steel is primarily composed of iron with carbon and other
elements.
4. What is the carbon content range of cast iron?
A. 0.02–0.1%
B. 0.1–0.3%
C. 2–4%
D. 5–7%
Rationale: Cast iron typically contains 2–4% carbon, making it brittle but
strong in compression.
5. Which test measures resistance to indentation?
A. Tensile test
B. Impact test
C. Fatigue test
D. Hardness test
Rationale: Hardness tests like Brinell or Rockwell measure resistance to
indentation.
6. What process involves rapid cooling of metal in water or oil?
, A. Annealing
B. Normalizing
C. Quenching
D. Stress relieving
Rationale: Quenching rapidly cools metal to increase hardness.
7. Which crystal structure is FCC?
A. Ferrite
B. Pearlite
C. Austenite
D. Martensite
Rationale: Austenite has a face-centered cubic (FCC) structure.
8. What is the main purpose of annealing?
A. Increase hardness
B. Increase brittleness
C. Improve ductility
D. Reduce corrosion
Rationale: Annealing softens metal and improves ductility.
9. Which defect is a line imperfection in crystals?
A. Vacancy
B. Interstitial
C. Grain boundary
EXAM Questions With Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of heat treatment in metals?
A. Increase color
B. Reduce weight
C. Improve mechanical properties
D. Increase electrical resistance
Rationale: Heat treatment modifies structure to improve strength,
hardness, ductility, or toughness.
2. Which process involves heating steel and then cooling it slowly in
air?
A. Quenching
B. Tempering
C. Normalizing
D. Carburizing
Rationale: Normalizing refines grain structure by air cooling after
heating above critical temperature.
3. What is the main component of steel?
,A. Copper
B. Aluminum
C. Nickel
D. Iron
Rationale: Steel is primarily composed of iron with carbon and other
elements.
4. What is the carbon content range of cast iron?
A. 0.02–0.1%
B. 0.1–0.3%
C. 2–4%
D. 5–7%
Rationale: Cast iron typically contains 2–4% carbon, making it brittle but
strong in compression.
5. Which test measures resistance to indentation?
A. Tensile test
B. Impact test
C. Fatigue test
D. Hardness test
Rationale: Hardness tests like Brinell or Rockwell measure resistance to
indentation.
6. What process involves rapid cooling of metal in water or oil?
, A. Annealing
B. Normalizing
C. Quenching
D. Stress relieving
Rationale: Quenching rapidly cools metal to increase hardness.
7. Which crystal structure is FCC?
A. Ferrite
B. Pearlite
C. Austenite
D. Martensite
Rationale: Austenite has a face-centered cubic (FCC) structure.
8. What is the main purpose of annealing?
A. Increase hardness
B. Increase brittleness
C. Improve ductility
D. Reduce corrosion
Rationale: Annealing softens metal and improves ductility.
9. Which defect is a line imperfection in crystals?
A. Vacancy
B. Interstitial
C. Grain boundary
