Engineering Materials Objective Questions with Answers - Set 04

Practice Test: Question Set - 04


1. The alloy, mainly used for corrosion resistance in stainless steels is
    (A) Silicon
    (B) Manganese
    (C) Carbon
    (D) Chromium

2. The correct sequence for descending order of machinability is
    (A) Grey cast iron, low carbon steel, wrought iron
    (B) Low carbon steel, grey cast iron, wrought iron
    (C) Wrought iron, low carbon steel, grey cast iron
    (D) Wrought iron, grey cast iron, low carbon steel

3. Duralumin 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

4. Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio
    (A) 50 : 50
    (B) 30 : 70
    (C) 70 : 30
    (D) 40 : 60

5. A steel containing 16 to 18% chromium and about 0.12% carbon is called
    (A) Ferritic stainless steel
    (B) Austenitic stainless steel
    (C) Martenistic stainless steel
    (D) Nickel steel

6. Ductile cast iron
    (A) Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
    (B) Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
    (C) Is produced by annealing process. It is soft, tough and easily machined metal
    (D) Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

7. Which of the following iron exist between 910°C and 1403°C?
    (A) α-iron
    (B) β-iron
    (C) γ-iron
    (D) δ-iron

8. Malleable cast iron
    (A) Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
    (B) Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
    (C) Is produced by annealing process. It is soft, tough, and easily machined metal
    (D) Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

9. The presence of hydrogen in steel causes
    (A) Reduced neutron absorption cross-section
    (B) Improved Weldability
    (C) Embrittlement
    (D) Corrosion resistance

10. Which is the false statement about wrought iron? It has
    (A) High resistance to rusting and corrosion
    (B) High ductility
    (C) Ability of hold protective coating
    (D) Uniform strength in all directions

11. Which of the following is added in low carbon steels to prevent them from becoming porous?
    (A) Sulphur
    (B) Phosphorus
    (C) Manganese
    (D) Silicon

12. Which of the following element results in presence of free graphite in C.I.?
    (A) Carbon
    (B) Sulphur
    (C) Silicon
    (D) Manganese

13. Free cutting steels
    (A) Contain carbon in free from
    (B) Require minimum cutting force
    (C) Is used where rapid machining is the prime requirement
    (D) Can be cut freely

14. Grey cast iron
    (A) Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
    (B) Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
    (C) Is produced by annealing process. I is soft, tough and easily machined metal
    (D) Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material

15. The aluminium alloy, mainly used, for anodized utensil manufacture, is
    (A) Duralumin
    (B) Y-alloy
    (C) Magnalium
    (D) Hindalium

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Engineering Materials:
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