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Q1. Which of the following display properties similar to that of steel?
(A) Blackheart cast iron
(B) Whiteheart cast iron
(C) Both (A) and (B)
(D) None of these
Answer:(C) Both (A) and (B)
Q2. Recrystallization temperature is one
(A) At which crystals first start forming from molten metal when it is cooled
(B) At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
(C) At which change of allotropic form takes place
(D) At which crystals grow bigger in size
Answer: (B) At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
Q3. Induction hardening is basically a
(A) Carburising process
(B) Surface hardening process
(C) Core hardening process
(D) None of these
Answer: (B) Surface hardening process
Q4. 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
Answer: (D) It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
Q5. 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
Answer: (B) The shape and distribution of the carbides in iron
Q6. 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
Answer: (D) All of these
Q7. By severely deforming a metal in a particular direction it becomes
(A) Ductile
(B) Malleable
(C) Homogeneous
(D) Anisotropic
Answer: (D) Anisotropic
Q8. An example of amorphous material is
(A) Zinc
(B) Lead
(C) Silver
(D) Glass
Answer: (D) Glass
Q9. Cupola produces following material
(A) Cast iron
(B) Pig iron
(C) Wrought iron
(D) Malleable iron
Answer: (A) Cast iron
Q10. The alloy used for making electrical resistances and heating elements is
(A) Nichrome
(B) Invar
(C) Magnin
(D) Elinvar
Answer:(A) Nichrome
Q11. Acidic solution is one which has pH value
(A) Greater than 7
(B) Less than 7
(C) Equal to 7
(D) pH value has nothing to do with neutral solution
Answer: (B) Less than 7
Q12. The type of space lattice found in gamma-iron is
(A) Face centered cubic space lattice
(B) Body centered cubic space lattice
(C) Close packed hexagonal space lattice
(D) None of these
Answer: (A) Face centered cubic space lattice
Q13. Which is false statement about properties of aluminium?
(A) Modulus of elasticity is fairly low
(B) Wear resistance is very good
(C) Fatigue strength is not high
(D) Creep strength limits its use to fairly low temperatures
Answer: (B) Wear resistance is very good
Q14. The charge is fed into the blast furnace through the
(A) Stack
(B) Throat
(C) Bosh
(D) Tyres
Answer: (B) Throat
Q15. The crystal of alpha iron is
(A) Body centered cubic
(B) Face centered cubic
(C) Hexagonal close packed
(D) Cubic structure
Answer: (A) Body centered cubic
Q16. 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
Answer: (D) Hard and gives a fine grained crystalline structure
Q17. 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
Answer: (A) Soft and gives a coarse grained crystalline structure
Q18. The basic constituents of Hastelloy are
(A) Aluminium, copper etc.
(B) Nickel, molybdenum etc.
(C) Nickel, Copper, etc.
(D) All of the above
Answer:(B) Nickel, molybdenum etc.
Q19. Solder is an alloy consisting of
(A) Tin, antimony, copper
(B) Tin and copper
(C) Tin and lead
(D) Lead and zinc
Answer: (B) Tin and copper
Q20. Which is false statement about tempering? Tempering is done to
(A) Improve machinability
(B) Improve ductility
(C) Improve toughness
(D) Release stresses
Answer: (A) Improve machinability
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