Chemical Engineering - Process Equipment and Plant Design

36. 

Maximum plate efficiency is achieved in case of __________ flow.

A. split
B. cross
C. cascade
D. reverse

Answer: Option B

Explanation:

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37. 

The LMTD correction factor (FT) is defined as the

A. ratio of true temperature difference to the LMTD.
B. ratio of LMTD to the true temperature difference.
C. differenced of true temperature difference and the LMTD.
D. geometric mean of the true temperature difference and the LMTD.

Answer: Option A

Explanation:

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38. 

The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.

A. equal to
B. half
C. one fourth
D. three fourth

Answer: Option C

Explanation:

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39. 

The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

A. 0.25
B. 0.50
C. 0.75
D. 1.25

Answer: Option A

Explanation:

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40. 

Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

A. 1.5-2.5
B. 3.5-5.5
C. 7.5-10.0
D. 10-15

Answer: Option A

Explanation:

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