Related Questions

Which one of the following is used for water softening?
A Mg(HCO3)2
B Na3PO4
C Na6P6O18
D Na2HPO4
The major disadvantage of lime soda process of water softening is that
A It is unsuitable for turbid and acidic water
B Huge amount of precipitate is formed which creates a disposal problem
C The effluent cannot be reduced to zero hardness
D It is unsuitable for softening the water of excessive hardness
Zeolite used in water softening process (cation exchange) is regenerated by washing with
A Brine
B Chloramines
C Sodium bisulphite
D Liquid chlorines
Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
A Oxidising
B Neutral
C Either A or B
D Neither A nor B
Which of the following heat treatment processes is used for softening the hardened material?
A Normalising
B Tempering
C Annealing
D None of these
To improve the machinability of steel by its softening, it is subjected to
A Cold working
B Annealing
C Shot blasting
D Heating
The heat treatment process used for softening hardened steel is
A Carburising
B Normalizing
C Annealing
D Tempering
The ability of a material to resist softening at high temperature is known as
A Creep
B Hot tempering
C Hot hardness
D Fatigue
A material is capable of resisting softening at high temperature, because of its property termed as
A Hot temper
B Hot hardness
C Fatigue
D Creep
Softening of hardned steel is done by its
A Normalising
B Tempering
C Annealing
D Carburising

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