Engineering Materials Objective Questions with Answers - Set 05 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 05

Practice Test: Question Set - 05

1. White cast iron
    (A) Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
    (B) Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
    (C) Is produced by annealing process. It is soft, tough and easily machined metal
    (D) Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

2. The compressive strength of cast iron is __________that of its tensile strength.
    (A) Equal to
    (B) Less than
    (C) More than
    (D) None of these

3. Monel metal contains
    (A) 63 to 67% nickel and 30% copper
    (B) 88% copper and 10% tin and rest zinc
    (C) Alloy of tin, lead and cadmium
    (D) Malleable iron and zinc

4. In the lower part of the blast furnace (zone of fusion), the temperature is
    (A) 400° to 700°C
    (B) 800°C to 1000°C
    (C) 1200°C to 1300°C
    (D) 1500°C to 1700°C

5. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
    (A) 770°C
    (B) 910°C
    (C) 1050°C
    (D) Below recrystallization temperature

6. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
    (A) Coordination number
    (B) Atomic packing factor
    (C) Space lattice
    (D) None of these

7. Which is false statement about annealing? Annealing is done to
    (A) Relieve stresses
    (B) Harden steel slightly
    (C) Improve machining characteristic
    (D) Soften material

8. When low carbon steel is heated up to upper critical temperature
    (A) There is no change in grain size
    (B) The average grain size is a minimum
    (C) The grain size increases very rapidly
    (D) The grain size first increases and then decreases very rapidly

9. Dislocations in materials refer to the following type of defect
    (A) Point defect
    (B) Line defect
    (C) Plane defect
    (D) Volumetric defect

10. Pearlite consists of
    (A) 13% carbon and 87% ferrite
    (B) 13% cementite and 87% ferrite
    (C) 13% ferrite and 87% cementite
    (D) 6.67% carbon and 93.33% iron

11. Sulphur in steel
    (A) Acts as deoxidiser
    (B) Reduces the grain size
    (C) Decreases tensile strength and hardness
    (D) Lowers the toughness and transverse ductility

12. The toughness of a material __________ when it is heated.
    (A) Remain same
    (B) Decreases
    (C) Increases
    (D) None of these

13. Structural steel contains following principal alloying elements
    (A) Nickel, chromium and manganese
    (B) Tungsten, molybdenum and phosphorous
    (C) Lead, tin, aluminium
    (D) Zinc, sulphur, and chromium

14. In basic Bessemer process, the furnace is lined with
    (A) Silica bricks
    (B) A mixture of tar and burnt dolomite bricks
    (C) Both (A) and (B)
    (D) None of these

15. Aluminium bronze contains
    (A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
    (B) 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
    (C) 10% aluminium and 90% copper
    (D) 90% magnesium and 9% aluminium with some copper

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