Chemical Engineering - Process Equipment and Plant Design

41. 

The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

A. Flat plate
B. Hemispherical
C. Torispherical
D. Ellipsoidal

Answer: Option D

Explanation:

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42. 

For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

A. Di, opt = 3 Q0.36 ρ0.18
B. Di, opt = 3.9 Q0.45 . ρ0.23
C. Di, opt = 7.6 Q0.36 . ρ0.9
D. Di, opt = 3 Q0.36 . ρ1.86 μ0.08

Answer: Option A

Explanation:

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43. 

Pick out the correct statement.

A. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower.
B. Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
C. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty.
D. none of these.

Answer: Option B

Explanation:

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44. 

Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

A. more
B. less
C. same
D. cither (a) or (b); depends upon the I.D. of the pipe

Answer: Option B

Explanation:

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45. 

Pick out the wrong statement pertaining to the design of a basket type evaporator.

A. It is used for high viscosity liquor having large rate of scaling.
B. The tube bundle is suspended on bracket.
C. There is no central downtake.
D. Downtake is formed by the annular space between the bundle and the shell.

Answer: Option A

Explanation:

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