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.
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 - Low purity oxygen is used for____________________?
A. L.D. steel making
B. Cutting and welding of metals
C. Medicinal purposes
D. Chemical oxidation processes - Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about ______________ °C ?
A. -83
B. -183
C. -196
D. -218 - High purity nitrogen is used in__________________?
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) - Oxygen is produced by fractionation of air using _____________ process?
A. Linde’s
B. Claude’s
C. Either A. or B.
D. None of these - Use of water having dissolved oxygen in boilers promotes___________________?
A. Corrosion
B. Sequestration
C. Scale formation
D. None of these - Presence of carbonaceous matter in the sewage____________________?
A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic
creatures
B. Reduces sulphate ions to sulphides causing obnoxious smell
C. Increases the quantity of chlorine used for its purification
D. All A, B. and C. - In an integrated steel plant, NH3 present in coke oven gas is normally recovered as_________________?
A. (NH4)2SO4
B. NH4Cl
C. (NH4)2 NO3
D. Liquid NH3 - Chemical formula of ‘salt cake’ is____________________?
A. Na2SO4
B. CaSO4
C. MgSO4
D. BaSO4 - The most widely used coagulant for removing suspended impurities from water is__________________?
A. Bleaching powder
B. Chlorine
C. Calcium sulphate
D. Alum
