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Process Equipment and Plant Design

Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

1.5 to 2
10 to 15
5 to 10
2.5 to 5

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Process Equipment and Plant Design
Optimum reflux ratio in a continuous distillation column is determined by the

Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
Maximum permissible vapour velocity
None of these
Flooding limit of the column

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Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = σL/2
σh = σL
No relation exists
σh = 2 σL

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Process Equipment and Plant Design
With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

Remains constant
Decreases very rapidly
Increases linearly
Increases very rapidly

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Process Equipment and Plant Design
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

D
√(2d)
√d
√(2πd)

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Process Equipment and Plant Design
The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.

43834
43832
4
2

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