Engineering Materials Objective Questions with Answers - Set 02

Practice Test: Question Set - 02


1. Which of the following impurity in cast iron makes it hard and brittle?
    (A) Silicon
    (B) Sulphur
    (C) Manganese
    (D) Phosphorus

2. Tensile strength of steel can be safely increased by
    (A) Adding carbon up to 2.8%
    (B) Adding carbon up to 6.3%
    (C) Adding carbon up to 0.83%
    (D) Adding small quantities of copper

3. Which of the following metal is used for nuclear energy?
    (A) Uranium
    (B) Thorium
    (C) Niobium
    (D) All of these

4. Cemented carbide tools are not found to be suitable for cutting
    (A) Brass
    (B) Cast iron
    (C) Aluminium
    (D) Steel

5. Y-alloy contains
    (A) 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
    (B) 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
    (C) 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
    (D) 5 to 6% tin, 2 to 3% copper and rest aluminium

6. Amorphous material is one
    (A) In which atoms align themselves in a geometric pattern upon solidification
    (B) In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
    (C) Which is not attacked by phosphorous
    (D) Which emits fumes on melting

7. According to Indian standard specifications, SG 400/15 means
    (A) Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
    (B) Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
    (C) Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
    (D) None of the above

8. Brass (alloy of copper and zinc) is an example of
    (A) Substitutional solid solution
    (B) Interstitial solid solution
    (C) Intermetallic compounds
    (D) All of the above

9. In process annealing, the hypo eutectoid steel is
    (A) Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
    (B) Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
    (C) Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
    (D) Heated below or closes to the lower critical temperature and then cooled slowly

10. Pick up the wrong statement
    (A) Aluminium in steel results in excessive grain growth
    (B) Manganese in steel induces hardness
    (C) Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility
    (D) Tungsten in steels improves magnetic properties and hardenability

11. A coarse grained steel
    (A) Is less tough and has a greater tendency to distort during heat treatment
    (B) Is more ductile and has a less tendency to distort during heat treatment
    (C) Is less tough and has a less tendency to distort during heat treatment
    (D) Is more ductile and has a greater tendency to distort during heat treatment

12. Pick up the wrong statement Nickel and chromium in steel help in
    (A) Providing corrosion resistance
    (B) Improving machining properties
    (C) Providing high strength at elevated temperatures
    (D) Raising the elastic limit

13. Normalising of steel is done to
    (A) Refine the grain structure
    (B) Remove strains caused by cold working
    (C) Remove dislocations caused in the internal structure due to hot working
    (D) All of the above

14. Steel contains
    (A) 80% or more iron
    (B) 50% or more iron
    (C) Alloying elements like chromium, tungsten nickel and copper
    (D) Elements like phosphorus, sulphur and silicon in varying quantities

15. Which of the following has a fine gold colour and is used for imitation jewellery?
    (A) Silicon bronze
    (B) Aluminium bronze
    (C) Gun metal
    (D) Babbitt metal

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Engineering Materials:
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