The chemical most commonly used to speed sedimentation of sewage is
A.sulphuric acid
B.copper sulphate
C.lime
D.sodium ermanganate
A.sulphuric acid
B.copper sulphate
C.lime
D.sodium ermanganate
A.Remains the same
B.Decreases due to convection
C.Increases due to convection
D.Increases due to radiation
E.Decreases due to radiation
A.Motor spirit
B.Light diesel oil
C.Aviation turbine fuel
D.High speed diesel oil
A.175? and 185?C
B.900? and 950?C
C.100? and 110?C
D.470? and 490?C
A.125-150
B.95-120
C.60-90
D.0-25
A.931 J
B.931 eV
C.931 MeV
D.9.31 MeV
A.Gasoline
B.Aviation turbine fuel
C.High speed diesel oil
D.Furnace oil
A.corrosion in the crude distillation unit column overhead system
B.erosion of crude petroleum pumps
C.fouling of heat transfer surfaces
D.all of the above
A.16-24% Cr 7-12% Ni 1.5-2.0 Mn
B.35-36% Cr 1.5-2.0% Ni 8-14% Mn
C.7-12% Cr 1.5-2.0% Ni 16-24 Mn
D.1.5-2.0% Cr 7-12% Ni 16-24% Mn