Quiznetik
Engineering Materials | Set 5
1. Which of the following is used for imitation jewellery?
A. Aluminium bronze
B. Silicon bronze
C. Gun metal
D. Babbit alloy
E. Duralumin
Correct : A. Aluminium bronze
2. The modulus of elasticity E, the modulus of rigidity C, and Poisson's ratio are related by the equation
A. E = G (1+ 2
B. E = 2G (1 - 2
C. E = 2G (1 -
D. E = G (2 +
E. E = 2G (1 +
Correct : E. E = 2G (1 +
3. Cyaniding is the process of
A. Adding carbon and nitrogen to increase hardness of specimen uniformly
B. Adding carbon and nitrogen to increase hardness at the surface
C. Adding carbon steel
D. Adding carbon and nitrogen to increase hardness of core
E. Creating a layer on the surface to impart the property of wear resistance
Correct : B. Adding carbon and nitrogen to increase hardness at the surface
4. Which of the following can have positive or negative charge?
A. Neutron
B. Isotope
C. Hole
D. Electron
E. Iron
Correct : E. Iron
5. Which of the following material has lowest specific gravity?
A. Aluminium
B. Brass
C. Copper
D. High carbon steel
E. Zinc
Correct : A. Aluminium
6. The cast iron has
A. High ductility
B. High malleability
C. High tensile strength
D. Elastic limit close to ultimate breaking strength
E. None of the above
Correct : C. High tensile strength
7. Blisters in wrought iron cause
A. Brittleness at high temperatures
B. Brittleness at low temperatures
C. Loose textured metal
D. Voids created due to chemical reaction between carbon and iron oxide
E. None of the above
Correct : C. Loose textured metal
8. Limestone is added in blast furnace to flux
A. Silicon xoide
B. Carbon
C. MnO2
D. Sulphur
E. None of the above
Correct : A. Silicon xoide
9. Ligancy is
A. the number of atoms (or ions) surrounding and touching a central atom
B. a covalent bond between two atoms
C. the angle betweent he two closest directional bond of an atom
D. None of the above
E. None of the above
Correct : A. the number of atoms (or ions) surrounding and touching a central atom
10. The moisture content in a well seasoned timber is
A. 4 to 6 percent
B. 6 to 8 percent
C. 10 to 15 percent
D. 20 to 25 percent
E. None of the above
Correct : D. 20 to 25 percent
11. The product of a cupola known as
A. Malleable iron
B. Steel
C. Pig iron
D. Cast iron
E. Cast steel
Correct : D. Cast iron
12. The process of production of articles having a soft ductile interior and a very hard surface, is known as
A. Hardening
B. Hardening and tempering
C. Case hardening
D. Hardening and annealing
E. None of the above
Correct : C. Case hardening
13. The blast furnace uses the following as fuel
A. Blast furnace gas
B. Cooking coal
C. Producer gas
D. Coke
E. Coal
Correct : D. Coke
14. If steel is cooled in still air, the structure obtained is
A. Acicular
B. Pearlite
C. Martensite
D. Sorbite
E. Troosite
Correct : D. Sorbite
15. In reinforced conccrete, steel rods are used to increase
A. Tensile strength
B. Compressive strength
C. Shear strength
D. None of the above
E. Semi-conductors
Correct : A. Tensile strength
16. Lime stone acts as a flux in a cupola. It is generally added in the proportion
A. 30 kg of limestone per tonner of iron
B. One tonne of limestone per tonne of charge
C. 10 kg of limestone per tonne of iron
D. 500 kg of limestone per tonne of coke
E. 100 kg of limestone per tonne of iron
Correct : E. 100 kg of limestone per tonne of iron
17. Identify the correct statement
A. A metal which is brittle in tension may be ductile under hydrostatic compression
B. All materials undergo plastic deformation
C. In elastic materials yield stress and tensile strength are practically identical
D. A completely brittle material would not fracture at elastic limit
E. Brittleness is an important engineering consideration, because it allows the materials to redistribute localized stresses
Correct : A. A metal which is brittle in tension may be ductile under hydrostatic compression