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Process Equipment and Plant Design

Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

4 to 8
6 to 12
2 to 3
3 to 5

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Process Equipment and Plant Design
The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

Damaging
Working
Allowable
None of these

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Process Equipment and Plant Design
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

4 P/A
√A
A/P
4 A/P

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Process Equipment and Plant Design
The wall thickness for a large high pressure pipeline is determined by the consideration of the

Forces exerted by static and dynamic action at bends
Axial tensile stress in the pipe
Temperature stresses
Circumferential pipewall tension

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Process Equipment and Plant Design
Length to diameter ratio of most rotary driers is in the range of

1 to 2
4 to 10
20 to 30
10 to 20

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Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

< 30
< 7
> 7 < 15
> 20 < 50

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