Engineering Materials Objective Questions with Answers - Set 16

Practice Test: Question Set - 16

1. Pick up wrong statement about wrought iron
    (A) It contains carbon of the order of 0 to 0.25%
    (B) It melts at 1535°C
    (C) It is very soft and ductile
    (D) It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

2. Combined carbon in iron makes the metal
    (A) Soft and gives coarse grained crystalline structure
    (B) Soft and gives a fine grained crystalline structure
    (C) Hard and gives a coarse grained crystalline structure
    (D) Hard and gives a fine grained crystalline structure

3. Iron is
    (A) Paramagnetic
    (B) Ferromagnetic
    (C) Ferroelectric
    (D) Dielectric

4. Manganese is added in low carbon steel to
    (A) Make the steel tougher and harder
    (B) Raise the yield point
    (C) Make the steel ductile and of good bending qualities
    (D) All of the above

5. Chilled cast iron has
    (A) No graphite
    (B) A very high percentage of graphite
    (C) A low percentage of graphite
    (D) Graphite as its basic constituent of composition

6. The metal suitable for bearings subjected to light loads, is
    (A) Silicon bronze
    (B) White metal
    (C) Monel metal
    (D) Phosphor bronze

7. Cast iron has
    (A) High tensile strength
    (B) Its elastic limit close to the ultimate breaking strength
    (C) High ductility
    (D) All of the above

8. Nodular cast iron is produced by adding ________ to the molten cast iron.
    (A) Nickel
    (B) Chromium
    (C) Copper
    (D) Magnesium

9. In mottled cast iron, carbon is available in
    (A) Free form
    (B) Combined form
    (C) Nodular form
    (D) Partly in free and partly in combined state

10. An important property of malleable cast iron in comparison to grey cast iron is the high
    (A) Compressive strength
    (B) Ductility
    (C) Carbon content
    (D) Hardness

11. Monel metal is an alloy of
    (A) Nickel and copper
    (B) Nickel and chromium
    (C) Nickel, Chromium and iron
    (D) Copper and chromium

12. Carbon steel is
    (A) Made by adding carbon in steel
    (B) Refined from cast iron
    (C) An alloy of iron and carbon with varying quantities of phosphorus and sulphur
    (D) Extensively used for making cutting tools

13. Annealing of white cast iron results in production of
    (A) Malleable iron
    (B) Nodular iron
    (C) Spheroidal iron
    (D) Grey iron

14. The alloying element which can replace tungsten in high speed steels is
    (A) Nickel
    (B) Vanadium
    (C) Cobalt
    (D) Molybdenum

15. 'Killed steels' are those steels
    (A) Which are destroyed by burning
    (B) Which after their destruction are recycled to produce fresh steel
    (C) Which are deoxidized in the ladle with silicon and aluminium
    (D) In which carbon is completely burnt

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