Engineering Materials Objective Questions with Answers - Set 15

Practice Test: Question Set - 15

1. Induction hardening is basically a
    (A) Carburising process
    (B) Surface hardening process
    (C) Core hardening process
    (D) None of these

2. The crystal of alpha iron is
    (A) Body centered cubic
    (B) Face centered cubic
    (C) Hexagonal close packed
    (D) Cubic structure

3. Malleable cast iron is produced
    (A) By adding magnesium to molten cast iron
    (B) By quick cooling of molten cast iron
    (C) From white cast iron by annealing process
    (D) None of these

4. The unique property of cast iron is its high
    (A) Malleability
    (B) Ductility
    (C) Surface finish
    (D) Damping characteristics

5. Steel containing ferrite and pearlite is
    (A) Hard
    (B) Soft
    (C) Tough
    (D) Hard and tough

6. Cast iron is characterized by minimum of following percentage of carbon
    (A) 0.2%
    (B) 0.8%
    (C) 1.3%
    (D) 2%

7. Grey cast iron has
    (A) Carbon in the form of free graphite
    (B) High tensile strength
    (C) Low compressive strength
    (D) All of these

8. In grey cast iron, carbon is present in the form of
    (A) Cementite
    (B) Free carbon
    (C) Flakes
    (D) Spheroids

9. In nodular iron, graphite is in the form of
    (A) Cementite
    (B) Free carbon
    (C) Flakes
    (D) Spheroids

10. In high speed steels, manganese is used to tougher the metal and to increase its
    (A) Yield point
    (B) Critical temperature
    (C) Melting point
    (D) Hardness

11. In malleable iron, carbon is present in the form of
    (A) Cementite
    (B) Free carbon
    (C) Flakes
    (D) Nodular aggregates of graphite

12. The purpose of heat treatment is to
    (A) Relieve the stresses set up in the material after hot or cold working
    (B) Modify the structure of the material
    (C) Change grain size
    (D) Any one of these

13. Wrought iron is
    (A) Hard
    (B) High in strength
    (C) Highly resistant to corrosion
    (D) Heat treated to change its properties

14. When the steel is normalized, its
    (A) Yield point increases
    (B) Ductility decreases
    (C) Ultimate tensile strength increases
    (D) All of these

15. Sulphur in pig iron tends to make it
    (A) Hard
    (B) Soft
    (C) Ductile
    (D) Tough

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Engineering Materials:
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