Engineering Materials Objective Questions with Answers – Set 16

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All questions answers in the last paragraph

Q1. ‘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

Q2. Hardness of steel depends on

(A) Amount of carbon it contains
(B) The shape and distribution of the carbides in iron
(C) Method of fabrication
(D) Contents of alloying elements

Q3. The electric process of steel making is especially adapted to

(A) Alloy and carbon tool steel
(B) Magnet steel
(C) High speed tool steel
(D) All of these

Q4. By severely deforming a metal in a particular direction it becomes

(A) Ductile
(B) Malleable
(C) Homogeneous
(D) Anisotropic

Q5. Compressive strength of grey cast iron in tonnes/cm is of the order of

(A) 35
(B) 57
(C) 710
(D) 1015

Q6. The alloying element which can replace tungsten in high speed steels is

(A) Nickel
(B) Vanadium
(C) Cobalt
(D) Molybdenum

Q7. Free carbon in iron makes the metal

(A) Soft and gives a 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

Q8. The basic constituents of Hastelloy are

(A) Aluminium, copper etc.
(B) Nickel, molybdenum etc.
(C) Nickel, Copper, etc.
(D) All of the above

Q9. Solder is an alloy consisting of

(A) Tin, antimony, copper
(B) Tin and copper
(C) Tin and lead
(D) Lead and zinc

Q10. Melting point of iron is

(A) 1539°C
(B) 1601°C
(C) 1489°C
(D) 1712°C

Q11. Annealing of white cast iron results in production of

(A) Malleable iron
(B) Nodular iron
(C) Spheroidal iron
(D) Grey iron

Q12. Maximum percentage of carbon in ferrite is

(A) 0.025%
(B) 0.06%
(C) 0.1%
(D) 0.25%

Q13. German silver contains

(A) 1% silver
(B) 2% silver
(C) 5% silver
(D) No silver

Q14. Iron ore is usually found in the form of

(A) Oxides
(B) Carbonates
(C) Sulphides
(D) All of these

Q15. The presence of sulphur in pig iron makes

(A) It easily machinable
(B) It brittle
(C) It hard
(D) The casting unsound

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