# Chemical Engineering - Process Equipment and Plant Design

### Exercise :: Process Equipment and Plant Design - Section 4

1.

In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

 A. Aa = Sa B. 1.2 Aa = 1.2 Sa C. Sa = 1.5 Aa D. Aa = 1.5 Sa

Explanation:

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2.

Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

 A. hG = 1.004G0.37 B. 1.004G0.8 C. hG = 0.0176G0.37 D. 0.0176G1.37

Explanation:

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3.

In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

 A. D2 B. D5 C. D D. D9

Explanation:

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4.

Apex angle of conical heads used in the bottom heads of chemical process equipments is usually

 A. 30° B. 45° C. 60° D. 75°

Explanation:

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5.

Pressure drop due to pipe fittings can be estimated by the equation, , where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (dimensionless) for 45° elbow and 180° close return bends would be respectively around

 A. 5 and 10 B. 45 and 75 C. 180 and 300 D. 300 and 500