Maximum acceptable total liquid gradient over a tray is about _______________ mm?
Maximum acceptable total liquid gradient over a tray is about _______________ mm?
A. 5.5
B. 12.5
C. 30.5
D. 45.5
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If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?A. Increase by 1.8
B. Decrease by 22
C. Increase by 21.6
D. None of theseIn case of a continuous distillation column, increase in reflux ratio may result in the______________?
In case of a continuous distillation column, increase in reflux ratio may result in the______________?A. Lower fixed charges for the column
B. Greater cost for the reboiler heat supply
C. Greater cost for the condenser coolant
D. All A., B. and C.A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?A. 2
B. 20.8
C. 20.2
D. None of theseMaximum allowable vapour velocity in a bubble cap tower is determined by the ____________________?
Maximum allowable vapour velocity in a bubble cap tower is determined by the ____________________?A. Entrainment considerations
B. Vapour density
C. Diameter of the column
D. None of theseIn a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?
In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?A. 1
B. 8
C. 80
D. 180Joint efficiency (J) for a seamless pipe is_______________?
Joint efficiency (J) for a seamless pipe is_______________?A. 1
B. 0.85
C. 1.5
D. < 0.5