Engineering Materials Objective Questions with Answers - Set 12

Practice Test: Question Set - 12

1. The coordination number of a face centered cubic space lattice is
    (A) Six
    (B) Twelve
    (C) Eighteen
    (D) Twenty

2. Lead is poured into the joint between two pipes. These pipes may be made of
    (A) Cast iron
    (B) Vitrified clay
    (C) Asbestos cement
    (D) Concrete

3. Brass is an alloy of
    (A) Copper and zinc
    (B) Copper and tin
    (C) Copper, tin and zinc
    (D) None of these

4. Malleability of a material can be defined as
    (A) Ability to undergo large permanent deformations in compression
    (B) Ability to recover its original form
    (C) Ability to undergo large permanent deformations in tension
    (D) All of the above

5. Tin base white metals are used where the bearings are subjected to
    (A) Large surface wear
    (B) Elevated temperatures
    (C) Light load and pressure
    (D) High pressure and load

6. Which of the following is not the correct method of increasing fatigue limit?
    (A) Shot peening
    (B) Nitriding of surface
    (C) Cold working
    (D) Surface decarburisation

7. In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled
    (A) In still air
    (B) Slowly in the furnace
    (C) Suddenly in a suitable cooling medium
    (D) Any one of these

8. Materials after cold working are subjected to following process to relieve stresses
    (A) Hot working
    (B) Tempering
    (C) Normalizing
    (D) Annealing

9. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
    (A) Eutectic cast irons
    (B) Hypoeutectic cast irons
    (C) Hypereutectic cast irons
    (D) None of these

10. Which is false statement about case hardening? Case hardening is done by
    (A) Electroplating
    (B) Cyaniding
    (C) Induction hardening
    (D) Nitriding

11. White cast iron has
    (A) Carbon in the form of carbide
    (B) Low tensile strength
    (C) High compressive strength
    (D) All of these

12. Following elements have face-centered cubic structure
    (A) Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
    (B) Mg, Zn, Ti, Zr, Br, Cd
    (C) A iron (below 910°C and between 1400 to 1539°C), W
    (D) All of the above

13. When low carbon steel is heated up to lower 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

14. The molecules in a solid move
    (A) In a random manner
    (B) In a haphazard way
    (C) In circular motion
    (D) Back and forth like tiny pendulums

15. Balls for ball bearings are made of
    (A) Cast iron
    (B) Mild steel
    (C) Stainless steel
    (D) Carbon-chrome steel

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