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Process Equipment and Plant Design

Process Equipment and Plant Design
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.

15
7.5
20
2.5

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Process Equipment and Plant Design
Pressure drop per tray in the atmospheric distillation column is about __________ psi.

43833
0.01 - 0.5
0.5 - 1.0
0.07 - 0.12

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Process Equipment and Plant Design
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.

35
10
30
20

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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.

Allowable
Damaging
None of these
Working

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

0.0176G1.37
1.004G0.8
HG = 0.0176G0.37
HG = 1.004G0.37

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Process Equipment and Plant Design
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

Lower
Unpredictable
Same
Higher

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