Related Questions

Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in
A Low bulk density product
B Biuret formation
C Non-spherical prills
D Substantially wet non-flowing and sticky product
Unit operation involved in the prilling of urea is
A Evaporation
B Drying
C Crystallisation
D Both B and C
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
The correct combination of the following groups of sentences "The boy climbed up to the top of the tower. The tower was steep and tall. The boy was my younger brother. There was none other" would be --
A The boy having climbed up to the top, steep tower was my younger brother
B The boy who climbed up to the top, steep tower was my younger brother
C The boy who climbed up to the tall tower all alone was my younger brother
D The boy climbing the top, steep tower was my younger brother
A boy is standing at the top of the tower and another boy is at the ground at some distance from the foot of the tower, then the angle of elevation and depression between the boys when both look at a each other will be-
A Equal
B Angle of elevation will be greater
C Cannot be predicted for relation
D Angle of depression will be greater
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
A 10-15
B 30-40
C 70-80
D 90-100
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?
A Circle
B Parabolic
C Great circle
D Hyper–parabolic
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
A Is greater than
B Is lower than
C Is same as
D Cannot be predicted as data are insufficient
A packed tower compared to a plate tower for a particular mass transfer operation
A Incurs smaller pressure drop
B Allows installation of cooling coils
C Is less costly when built in large sizes/diameters
D Is more suitable, if suspended solids are present in fluid streams
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
A > 4 :1
B > 8:1

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