The unit of filter medium resistance is cm-1 gm/cm-1 cm/gm-1 gm-1

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Correct Answer

cm^-1

1. The composition of fresh feed to the high temperature, high pressure urea autoclave is
Options
A. excess liquid ammonia and liquefied CO₂.
B. excess liquid ammonia and compressed CO₂ gas.
C. liquid ammonia and excess compressed CO₂.
D. compressed ammonia gas and excess compressed CO₂.

3. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ ? CO₂ + 2H₂O. Both the reactants and products are in gas phase. ?H�₂₉₈ = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
Options
A. 0.19
B. 0.33
C. 0.40
D. 0.67

6. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
Options
A. Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
B. Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
C. The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
D. In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes.

7. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
Options
A. no possibility of obtaining complete combustion at high temperature.
B. always loss of heat from the flame.
C. both (a) and (b).
D. neither (a) nor (b).

8. Pick out the wrong statement about the design of a sieve plate column.
Options
A. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns.
B. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design.
C. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns.
D. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.

10. Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
Options
A. its calorific value is very less.
B. tar neutralises the residual acids present in pitch.
C. it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
D. all (a), (b) and (c).

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