Related Questions

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
A Less than
B More than
C Same as
D Very much less
Bubble cap tray is the most commonly used tray in large distillation column, because
A Of its flexibility and nearly constant efficiency under varying conditions of operation
B It incurs less pressure drop as compared to any other try designed for the same duty
C It eliminates the foaming and entrain-ment tendency during operation
D None of these
A rectangular sheet of paper, 10 cm long and 8 cm wide has squares of side 2 cm cut from each of its corner. The sheet is then folded to form a tray of depth 2cm. What is the volume of this tray?
A 32cm3
B 48cm3
C 49cm3
D 54cm3
Pressure drop per tray in the atmospheric distillation column is about __________ psi.
A 0.01 - 0.5
B 0.07 - 0.12
C 0.5 - 1.0
D 1 - 3
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
A $$\frac{{\text{Q}}}{2}$$
B $$\frac{{\text{Q}}}{4}$$
C $$\frac{{\text{Q}}}{8}$$
D $$\frac{{\text{Q}}}{{16}}$$
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.
A Wetted wall
B Bubble cap
C Perforated tray
D Packed
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure
A Increases
B Decreases
C Remains same
D May increase or decrease depending upon the solubility of the gas in the liquid
Maximum acceptable total liquid gradient over a tray is about __________ mm.
A 5.5
B 12.5
C 30.5
D 45.5
The operating pressure drop range in a bag filter is about __________ mm water gauge.
A 50-150
B 5-10
C 500-1500
D 1500-2500
Liquid gradient over the tray results due to the
A Resistance offered to flow of liquids by caps & risers and the flow of gas
B Low gas velocity
C Large plate spacing
D Large reflux ratio

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