Related Questions

A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,
A Composition of vapors and that of liquid do not vary throughout the column
B Reboiler load and condenser load are minimum
C The top and bottom compositions are unchanged with and without total reflux
D The top and bottom compositions correspond to the maximum enrichment available
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
A 70
B 55
C 80
D 94
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
A Gives higher yield of petrol
B Lower octane number of petrol
C Higher sulphur content in the product
D Higher gum forming material in petrol
Point A is 10 miles West of Point B. Point b is 30 miles North of pint C. Point C is 20 miles East of Point D. What is the distance (in miles) between Point A and Point D?
A 1010
B 1020
C 2010
D 3010
Point A is 10 km west of point B. Point B is 30 km north of point C. Point C is 20 km east of point D. What is the distance between point A and D?
A 1020Km
B 1010Km
C 2010Km
D 3010Km
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
A Thermal cracking
B Gum formation
C Coking
D Discoloration
Flash point of an oil is determined by the
A Pensky Martens apparatus
B Ramsbottom apparatus
C Saybolt viscometer
D Conradson apparatus
In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
A Sulphur increases
B Sulphur decreases
C Nitrogen decreases
D None of these
Pressure drop per tray in the atmospheric distillation column is about __________ psi.
A 0.01 - 0.5
B 0.07 - 0.12
C 0.5 - 1.0
D 1 - 3

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