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Process Equipment and Plant Design

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
4
2
43832

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of

3000
10000
5000
1000

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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.

Working
Allowable
Damaging
None of these

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Process Equipment and Plant Design
In a __________ rivetted joint, the rivets in the various rows are opposite to each other.

Zig-zag
None of these
Diamond
Chain

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Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Less than arithmetic mean value
More than geometric mean value
Both B & C
More than arithmetic mean value

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Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

< 4 : 1 for gas-gas exchangers
4 : 1 to 8 : 1 for liquid-liquid exchanger
8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
Both B & C

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