A.chemical reaction is the controlling resistance
B.diffusion through ash layer is the controlling resistance
C.film diffusion is the controlling resistance.
A.urea
B.ammonium sulphate
C.ammonium nitrate
D.calcium nitrate
A.0.702
B.7.02
C.70.2
D.120
A.The plate must be of low thermal conductivity
B.The plate surface must be smooth
C.The value of Prandtl number thust be 1
D.The value of Prandtl number must be zero
E.The value of Prandtl number must be 0.5
A.1837
B.1/1837
C.183.7
D.1/183.7
A.Single pass on shell side and double pass on tube side
B.Single pass on tube side and double pass on shell side
C.Single liquid cools two liwuids at different temperatures
D.Two tubes of cold fluid pass through one tube of hot fluid
E.Two tubes of hot fluid pass through one tube of cold tube
A.Olefins aromatics naphthenes paraffins
B.Aromatics naphthenes olefins paraffins
C.Paraffins naphthenes aromatics olefins
D.Paraffins olefins naphthenes armatics
A.x = y ? z
B.x ? y = z
C.x = y = z
D.x = y-1 = z
A.CO2
B.O2
C.N2
D.CO
A.White polished surface
B.White rough surface
C.Black rough surface
D.Black polished surface
