A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
B. Fire fighting purposes
C. Both A. & B.
D. Neither A. nor (B)
Related Mcqs:
- Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about _____________ °C ?
A. -53
B. -103
C. -183
D. -196 - 99.5% purity oxygen is used in_____________________?
A. Cutting and welding by oxy-acetylene flame
B. Hospitals for medicinal purposes
C. Gas masks and artificial breathing apparatus
D. All A, B, and C. - Low purity oxygen is used for____________________?
A. L.D. steel making
B. Cutting and welding of metals
C. Medicinal purposes
D. Chemical oxidation processes - Nitrogen is an essential component of ____________________?
A. Mineral salts
B. Carbohydrates
C. Fats
D. Proteins - The main product of high temperature carbonisation of coal is_____________________?
A. Coke
B. Ammonia
C. Tar
D. Phenol - The yield of tar from high temperature carbonisation of dry coal is about _______________ percent?
A. 3
B. 12
C. 22
D. 0.3 - Refractory bricks having high thermal conductivity is desirable, when it is to be used in the _________________?
A. L.D. converter
B. Blast furnace
C. Rotary kiln
D. Recuperator - Refractory bricks burnt at very high temperature have got______________?
A. Greater resistance to corrosion by slags
B. Less resistance to corrosion by slags
C. High spalling tendency
D. None of these - The type of high refractive index glass used in optical instruments is _____________ glass?
A. Pyrex
B. Flint
C. Crookes
D. None of these - Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as ____________________ oil?
A. Drying
B. Semi-drying
C. Non-drying
D. None of these
