Chemical Engineering - Process Equipment and Plant Design

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

Answer: Option A

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

Answer: Option A

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

Answer: Option B

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°

Answer: Option C

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

Answer: Option B

Explanation:

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