Chemical Engineering - Process Equipment and Plant Design

46. 

In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a

A. clearance of 25-75 mm.
B. cap pitch of 1.3-2 times the cap diameter.
C. either 'a' or 'b'.
D. neither 'a' nor 'b'.

Answer: Option C

Explanation:

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47. 

The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

A. 0.6-0.8 times
B. equal to
C. twice
D. 2 ft irrespective of (for column > 3 ft diameter)

Answer: Option A

Explanation:

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48. 

for couplings and unions would be

A. 60
B. 200
C. 350
D. negligible

Answer: Option D

Explanation:

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49. 

What is the slope of the operating line in the rectifying section of a distillation coloumn ?

A. 0
B.
C. > 1
D. <1

Answer: Option D

Explanation:

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50. 

Stage efficiency for packed tower varies with the

A. type & size of packing.
B. fluid rates and fluid properties.
C. operating pressure and column diameter.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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