Related Questions

Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.
A $${\frac{1}{{10}}^{{\text{th}}}}$$
B $${\frac{1}{{20}}^{{\text{th}}}}$$
C $${\frac{1}{{30}}^{{\text{th}}}}$$
D $${\frac{1}{{50}}^{{\text{th}}}}$$
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.
A 2
B 8
C 12
D 18
Kelly and Chris packed several boxes with books. If Chris packed 60 percent of the total number of boxes, what was the ratio of the number of boxes Kelly packed to the number of boxes Chris packed?
A 1 to 6
B 1 to 4
C 2 to 5
D 2 to 3
For raschig rings, the sphericity is
A 0.5
B 1
C $$\sqrt 3 $$
The popular notion that a tree's age can be determined by counting number of internal rings in its trunk is generally true. Howeevr, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often →peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit →elav eing the tree with fewer rings than it would otherwise have. So only if the reliable measure of the tree's age. Which of the following is an assumption on whish the argument above depends?
A The growth of new rings in a trees is not a function of levels of precipitation.
B Only the Brazilaian ash loses rings because of excessive heat.
C One day of temperatures above 95 degrees Fahrenheit will cause the Brazilian ash to lose one ring.
D The internal rings of all tress are of uniform thickness
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
There are 9 black and red stones of same size in a box. If you reach into the box with your eyes close, what is the minimum number of stones you must take out to be sure of having a pair that match?
A 2
B 3
C 5
D 10
Sphericity of raschig ring (whose length and diameter are equal) is
A >1
B 1
C 2
Raschig ring made of procelain cannot be used for treating concentrated
A Hydrochloric acid
B Nitric acid
C Alkalis
D Sulphuric acid
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.
A 5
B 20
C 35
D 55

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