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.Management Sciences
Category: CHEMICAL ENGINEERING
Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?
A. At the hearth bottom of the furnace on which stock is placed
B. Used for furnace insulation
C. Used in the roof of the furnace
D. None of these
Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its calorific value tremendously
C. It reduces its flame temperature tremendously
D. There are chances of explosion during preheating
Which of the following is the most poisonous gas ?
A. Coke oven gas
B. Producer gas
C. Blast furnace gas
D. L.D. converter gas
Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?
A. Grashoff
B. Biot
C. Stanton
D. Reynolds
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is ___________________?
A. 0.33
B. 0.5
C. 1
D. Data insufficient, can’t be predicted
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?
A. Measures the elevation in boiling point
B. Is not dependent on the temperature
C. Is a function of the liquid phase composition
D. Measures the depression in freezing point
Lead is poured into the joint between two ______________ pipes?
A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement
Pick out the correct statement?
A. The capacity and the effectiveness of a screen are the same
B. The capacity and the effectiveness of screen are opposing factors
C. The screening surface of a ‘reel’ (a revolving screen used in flour mills) is made of silk bolting
cloth supported by wire mesh
D. Both B. and C.
Which of the following is not a batch drier ?
A. Truck drier
B. Agitated pan drier
C. Fluidised bed drier
D. Vacuum shelf drier
Pick out the wrong statement?
A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven
automobile exhaust
B. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light
C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees
D. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is
oxidised to SO2
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