Engineering Materials Objective Questions with Answers - Set 09 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 09

Practice Test: Question Set - 09

1. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will
    (A) Increase
    (B) Decrease
    (C) Remain same
    (D) First increase and then decrease

2. Macrostructure of a material is, generally, examined by
    (A) Naked eye
    (B) Optical microscope
    (C) Metallurgical microscope
    (D) X-ray techniques

3. Which of the following pipes is least corrosion resistant?
    (A) Brass
    (B) Mild steel
    (C) Cast iron
    (D) Wrought iron

4. Wrought iron
    (A) Is a ductile material
    (B) Can be easily forged or welded
    (C) Cannot stand sudden and excessive shocks
    (D) All of these

5. The metallic structure of mild steel is
    (A) Body centered cubic
    (B) Face centered cubic
    (C) Hexagonal close packed
    (D) Cubic structure

6. The material in which the atoms are arranged regularly in some directions but not in others, is called
    (A) Amorphous material
    (B) Mesomorphous material
    (C) Crystalline material
    (D) None of these

7. Vanadium in high speed steels
    (A) Promotes decarburisation
    (B) Provides high hot hardness
    (C) Forms very hard carbides and thus increases wear resistance
    (D) Promotes retention of austenite

8. Which of the following material has nearly zero coefficient of expansion?
    (A) Stainless steel
    (B) High speed steel
    (C) Invar
    (D) Heat resisting steel

9. Nodular iron has
    (A) High machinability
    (B) Low melting point
    (C) High tensile strength
    (D) All of the above

10. The addition of which of the following improves machining of copper?
    (A) Sulphur
    (B) Vanadium
    (C) Tin
    (D) Zinc

11. Pig iron is the name given to
    (A) Raw material for blast furnace
    (B) Product of blast furnace made by reduction of iron ore
    (C) Iron containing huge quantities of carbon
    (D) Iron in molten form in the ladles

12. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
    (A) Sulphur
    (B) Phosphorus
    (C) Manganese
    (D) Silicon

13. In which of the following cases, consideration of creep is important
    (A) Flywheel of steam engine
    (B) Cast iron pipes
    (C) Cycle chains
    (D) Gas turbine blades

14. Which of the following statement is correct?
    (A) The product produced by blast-furnace is called cast iron
    (B) The pig iron is the name given to the product produced by cupola
    (C) The cast iron has high tensile strength
    (D) The chilled cast iron has no graphite

15. Muntz metal contains copper and zinc in the ratio of
    (A) 50 : 50
    (B) 40 : 60
    (C) 60 : 40
    (D) 20 : 80

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