Engineering Materials Objective Questions with Answers - Set 13 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 13

Practice Test: Question Set - 13

1. Which of the following display properties similar to that of steel?
    (A) Blackheart cast iron
    (B) Whiteheart cast iron
    (C) Both (A) and (B)
    (D) None of these

2. Which is false statement about properties of aluminium?
    (A) Modulus of elasticity is fairly low
    (B) Wear resistance is very good
    (C) Fatigue strength is not high
    (D) Creep strength limits its use to fairly low temperatures

3. The steel widely used for motor car crankshafts is
    (A) Nickel steel
    (B) Chrome steel
    (C) Nickel-chrome steel
    (D) Silicon steel

4. Foundry crucible is made of
    (A) Mild steel
    (B) German silver
    (C) Lead
    (D) Graphite

5. The stiffness is the ability of a material to resist
    (A) Deformation under stress
    (B) Fracture due to high impact loads
    (C) Externally applied forces with breakdown or yielding
    (D) None of the above

6. The ability of a material to resist softening at high temperature is known as
    (A) Creep
    (B) Hot tempering
    (C) Hot hardness
    (D) Fatigue

7. The type of space lattice found in alpha-iron is
    (A) Face centered cubic space lattice
    (B) Body centered cubic space lattice
    (C) Close packed hexagonal space lattice
    (D) None of these

8. Mild steel belongs to the following category
    (A) Low carbon steel
    (B) Medium carbon steel
    (C) High carbon steel
    (D) Alloy steel

9. Closed packed hexagonal space lattice is found in
    (A) Zinc, magnesium, cobalt, cadmium, antimony and bismuth
    (B) Gamma-iron, aluminium, copper, lead, silver and nickel
    (C) Alpha-iron, tungsten, chromium and molybdenum
    (D) None of the above

10. The ultimate tensile strength of low carbon steel by working at a high strain rate will
    (A) Decrease
    (B) Increase
    (C) Remain constant
    (D) First increase and then decrease

11. When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
    (A) White cast iron
    (B) Nodular cast iron
    (C) Malleable cast iron
    (D) Alloy cast iron

12. Slow plastic deformation of metals under a constant stress is known as
    (A) Creep
    (B) Fatigue
    (C) Endurance
    (D) Plastic deformation

13. The elastic stress strain behavior of rubber is
    (A) Linear
    (B) Nonlinear
    (C) Plastic
    (D) No fixed relationship

14. Isotropic materials are those which have the same
    (A) Elastic properties in all directions
    (B) Stresses induced in all directions
    (C) Thermal properties in all directions
    (D) Electric and magnetic properties in all directions

15. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
    (A) Babbitt metal
    (B) Monel metal
    (C) Nichrome
    (D) Phosphor bronze

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