1. Which of the following metals cannot be produced by aqueous electrolysis?
(A) Zinc
(B) Copper
(C) Gold
(D) Aluminium
Answer: (D) Aluminium
2. The carbon content of low carbon, medium carbon and high carbon steel are respectively.
(A) (0-0.1)%; (0.1 – 0.4)% and (0.4 – 1.8)%
(B) (0.25-0.4) %; (0.4 – 0.7)% and (0.7 – 1.7)%
(C) Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)%
(D) None of these
Answer: (C) Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)%
3. Fracture stress for a brittle material having a crack length of 1 µm is 200 MPa. Fracture stress for the same material having a crack length of 4 µm is
(A) 200 MPa
(B) 150 MPa
(C) 100 MPa
(D) 50 MPa
Answer:
4. In blast roasting of copper ore, which of the following is blown through a layer of ore that
is on a moving grate.
(A) Air and oxygen
(B) Oxygen and steam
(C) Air
(D) Oxygen
Answer: (D) Oxygen
5. The riser is designed such that the melt in the riser solidifies
(A) Before casting solidifies
(B) At the same time as casting solidifies
(C) After casting solidifies
(D) Irrespective of the solidification of the casting
Answer:
6. Superalloys are
(A) Crystallization
(B) Polymerization
(C) Polygonization
(D) Homogenization
Answer: (C) Polygonization
(A) Zinc
(B) Copper
(C) Gold
(D) Aluminium
Answer: (D) Aluminium
2. The carbon content of low carbon, medium carbon and high carbon steel are respectively.
(A) (0-0.1)%; (0.1 – 0.4)% and (0.4 – 1.8)%
(B) (0.25-0.4) %; (0.4 – 0.7)% and (0.7 – 1.7)%
(C) Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)%
(D) None of these
Answer: (C) Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)%
3. Fracture stress for a brittle material having a crack length of 1 µm is 200 MPa. Fracture stress for the same material having a crack length of 4 µm is
(A) 200 MPa
(B) 150 MPa
(C) 100 MPa
(D) 50 MPa
Answer:
4. In blast roasting of copper ore, which of the following is blown through a layer of ore that
is on a moving grate.
(A) Air and oxygen
(B) Oxygen and steam
(C) Air
(D) Oxygen
Answer: (D) Oxygen
5. The riser is designed such that the melt in the riser solidifies
(A) Before casting solidifies
(B) At the same time as casting solidifies
(C) After casting solidifies
(D) Irrespective of the solidification of the casting
Answer:
6. Superalloys are
(A) Ni-based alloys
(B) Cu-based alloys
(C) Al-based alloys
(D) Mg-based alloys
(B) Cu-based alloys
(C) Al-based alloys
(D) Mg-based alloys
Answer: (A) Ni-based alloys
7. The property of a material that CANNOT be significantly changed by heat treatment is
(A) Yield strength
(B) Ultimate tensile strength
(C) Ductility
(D) Elastic modulus
Answer:
8. In eutectoid Plain carbon steel, which one of the following structures does NOT form
during continuous cooling?
(A) Fully bainitic
(B) pearlitic + bainitic
(C) Fully pearlitic
(D)Martensitic
during continuous cooling?
(A) Fully bainitic
(B) pearlitic + bainitic
(C) Fully pearlitic
(D)Martensitic
Answer: (A) Fully bainitic
9. The manufacturing process used for producing large curved disc is
(A) Stretch forming
(B) Forging
(C) Rolling
(D) Drawing
(A) Stretch forming
(B) Forging
(C) Rolling
(D) Drawing
Answer: (A) Stretch forming
10. The phenomenon of dislocations developing a low energy configuration on
annealing is known as.(A) Crystallization
(B) Polymerization
(C) Polygonization
(D) Homogenization
Answer: (C) Polygonization
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