In a body-centred cubic lattice system there are
A.1 atom per unit cell
B.2 atoms per unit cell
C.3 atoms per unit cell
D.4 atoms per unit cell
Category: Chemical Engineering Mcqs
The operating pressure drop for the electrostatic precipitator including perforated plates varies in the range of
A.0.2 to 0.5 in. H2O g
B.3 to 60 in. H2O g
C.2 to 6 in. H2O g
D.0.01 to 0.1 in. H2O g
Which one of the following substances is used as a nitrogenous fertilizer as a weed killer in the onion fields and for correcting acidic soils?
A.Urea
B.Basic slag
C.Superphosphate of lime
D.Calcium cyanamide
The electrostatic precipitators have an efficiency characteristic which is related primarily to exposure time i.e. the period during which a dust particle is exposed to the electrostatic field. Exposure time can be increased by
A.increasing the cross-sectional area of the precipitator
B.increasing its length in the direction of gas flow
C.both a and b
D.neither a nor b
The wavelength for maximum emissive power is given by
A.Planck’s law
B.Fourier’s law
C.Wein’s law
D.Stefan Boltzman’s law
E.Kirchhoff’s law
The generation of e.m.f. in thermocouples is fundamentally explained by
A.Ohms law
B.Stefan-Boltzmans law
C.Seebeck effect
D.Joule heating effect.
Select the wrong statement. Compared to platinum catalyst vanadium pentoxide catalyst used in contact process for the manufacture of H2SO4
A.is relatively immune to poisons
B.requires low initial investment and 5% replacement per year
C.requires low O2/SO2 to give economic conversion
D.requires dilute SO2 input (7-10%)
Select the three pressures that are not equivalent
A.14.696 psi 29.92 in. Hg 33.94 ft H2O
B.14.696 psi 29.92 in. Hg 1.01325 bar
C.29.92 in Hg 33.94 ft H2O 1.01325 x 105 N/m2
D.29.92 in Hg 2116 psf 1.01325 Pa.
Gases have poor
A.Reflectivity
B.Absorptivity
C.Transmissivity
D.Absorptivity + transmissivity
E.Reflectivity + absorptivity
