# Chemical Engineering - Process Equipment and Plant Design

### Exercise :: Process Equipment and Plant Design - Section 3

1.

Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

 A. 16 B. 19 C. 28 D. 38

Explanation:

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2.

Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.

 A. 300 B. 600 C. 1000 D. 1500

Explanation:

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3.

Ratio of tube length to shell diameter for a shell and tube heat exchanger is

 A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers. B. 4 : 1 to 8 : 1 for liquid-liquid exchanger. C. < 4 : 1 for gas-gas exchangers. D. both(b) & (c).

Explanation:

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4.

The dust collection efficiency of a cyclone separator

 A. decreases with increase in gas flow rate. B. is inversely proportional to the mass of the dust particle. C. is directly proportional to the radius of the dust particle path. D. none of these.

Explanation:

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5.

In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

 A. ∞ B. 1 C. 20.8 D. 2