Engineering Materials Objective Questions with Answers - Set 08 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 08

Practice Test: Question Set - 08

1. Which of the following metal shrinks most from molten state to solid state?
    (A) Cast iron
    (B) Cast steel
    (C) Brass
    (D) Admiralty metal

2. Tungsten in steel
    (A) Improves wear resistance, cutting ability and toughness
    (B) Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
    (C) Improves cutting ability and reduces hardenability
    (D) Gives ductility, toughness, tensile strength and anti-corrosion properties

3. The ability of a material to resist fracture due to high impact loads, is called
    (A) Strength
    (B) Stiffness
    (C) Toughness
    (D) Brittleness

4. Which is false statement about normalizing? Normalizing is done to
    (A) Refine grain structure
    (B) Reduce segregation in casting
    (C) Improve mechanical properties
    (D) Induce stresses

5. Hematite iron ore contains iron about
    (A) 30%
    (B) 45%
    (C) 55%
    (D) 70%

6. The surface hardness of the following order is achieved by nitriding operation
    (A) 600 VPN
    (B) 1500 VPN
    (C) 1000 to 1100 VPN
    (D) 250 VPN

7. The unit cells
    (A) Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
    (B) Have the same orientation and their similar faces are parallel
    (C) May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
    (D) All of the above

8. Which of the following represents the allotropic forms of iron?
    (A) Alpha iron, beta iron and gamma iron
    (B) Alpha iron and beta iron
    (C) Body centered cubic iron and face centered cubic iron
    (D) Alpha iron, gamma from and delta iron

9. Which of the following property is desirable for materials used in tools and machines?
    (A) Elasticity
    (B) Plasticity
    (C) Ductility
    (D) Malleability

10. Points of arrest for iron correspond to
    (A) Stages at which allotropic forms change
    (B) Stages at which further heating does not increase temperature for some time
    (C) Stages at which properties do not change with increase in temperature
    (D) There is nothing like points of arrest

11. The portion of the blast furnace below its widest cross-section is called
    (A) Hearth
    (B) Stack
    (C) Bosh
    (D) Throat

12. Taps dies and drills contain carbon
    (A) Below 0.5%
    (B) Below 1%
    (C) Above 1%
    (D) Above 2.2%

13. The coke in the charge of blast furnace
    (A) Controls the grade of pig iron
    (B) Acts as an iron bearing mineral
    (C) Supplies heat to reduce ore and melt the iron
    (D) Forms a slag by combining with impurities

14. The percentage of carbon in grey iron castings usually varies between
    (A) 0.5 to 1%
    (B) 1.2%
    (C) 2.5 to 4.5%
    (D) 5 to 7%

15. The machinability of steel is improved by adding
    (A) Nickel
    (B) Chromium
    (C) Nickel and chromium
    (D) Sulphur, lead and phosphorus

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