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- Question
Haematite iron ore contains iron about
Options- A. 30%
- B. 45%
- C. 55%
- D. 70%
- Correct Answer
- 70%
- 1. Smelting is the process of
Options- A. removing the impurities like clay, sand etc. from the iron ore by washing with water
- B. expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
- C. reducing the ore with carbon in the presence of a flux
- D. all of the above Discuss
- 2. Dye penetrant method is generally used to locate
Options- A. core defects
- B. surface defects
- C. superficial defects
- D. temporary defects Discuss
- 3. Cast iron is a
Options- A. ductile material
- B. malleable material
- C. brittle material
- D. tough material Discuss
- 4. The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.
Options- A. Yes
- B. No Discuss
- 5. The electric process of steel making is especially adopted to
Options- A. alloy and carbon tool steel
- B. magnet steel
- C. high speed tool steel
- D. all of these Discuss
- 6. When the steel is normalised, its
Options- A. yield point increases
- B. ductility decreases
- C. ultimate tensile strength increases
- D. all of these Discuss
- 7. The material in which the atoms are arranged regularly in some directions but not in others, is called
Options- A. amorphous material
- B. mesomorphous material
- C. crystalline material
- D. none of these Discuss
- 8. An eutectoid steel consists of
Options- A. wholly pearlite
- B. wholly austenite
- C. pearlite and ferrite
- D. pearlite and cementite Discuss
- 9. White cast iron has a high tensile strength and a low compressive strength.
Options- A. Yes
- B. No Discuss
- 10. The lower critical point for all steels is
Options- A. 600°C
- B. 700°C
- C. 723°C
- D. 913°C Discuss
Engineering Materials problems
Search Results
Correct Answer: reducing the ore with carbon in the presence of a flux
Correct Answer: surface defects
Correct Answer: brittle material
Correct Answer: No
Correct Answer: all of these
Correct Answer: all of these
Correct Answer: mesomorphous material
Correct Answer: wholly pearlite
Correct Answer: No
Explanation:
White cast iron has a low tensile strength and a high compressive strength.
Source: https://en.wikipedia.org/wiki/Cast_iron#Table_of_comparative_qualities_of_cast_irons
Correct Answer: 723°C
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