Prandtl number for gases is
A.near unity
B.between 10 to 100
C.between 100 and 1000
D.more than 1000
Category: Chemical Engineering Mcqs
Type 304 stainless steel contains
A.18% Cr 8% Ni 0.08%C (max)
B.8% Cr 18% Ni 0.08%C (max)
C.6% Cr 18% Ni 0.08%C (max)
D.18% Cr 36% Ni 0.08%C (max)
Portland cement is a finely ground
A.calcium aluninates and silicates of varying compositions
B.calcium aluminates and sodium silicates of varying compositions
C.calcium aluminates and caustic soda
D.calcium silicates and gypsum of fixed composition
In an aerosol
A.some of the particles may be positively charged
B.some of the particles may be negatively charged
C.some of the particles may be uncharged
D.all of the above
When can the relative humidity of air decrease inspite of an increase in the absolute humidity?
A.When the pressure rises
B.When the pressure falls
C.When the temperature rises
D.When the temperature falls
The rate of energy stored in the wall will be
A.50 kcal/min
B.50 kcal/sec
C.50 kcal/hr
D.200 kcal/hr
E.200 kcal/min
Thermal conductivity of glass wool depends on
A.Composition
B.Density
C.Porosity
D.Structure
E.All of the above
The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelength is found from the known rate of energy, which under the same condition would be emitted from a black surface by multiplying with the absorptivity. Above enunciation is known as
A.Planck’s law
B.Kirchhoff’s law
C.Stefan Boltzman law
D.Lambert rule
E.None of the above
Nuclear fission was first experimentally observed by
A.Fermi
B.Rutherford
C.Planck
D.Hahn and strassman
