Related Questions

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
A Hexagonal close, packed (hcp)
B Face centred cubic (fcc)
C Body centred cubic (bcc)
D Simple cubic
In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter.
A $${\frac{1}{5}^{{\text{th}}}}$$
B $${\frac{1}{{15}}^{{\text{th}}}}$$
C $${\frac{1}{{30}}^{{\text{th}}}}$$
D $${\frac{1}{{50}}^{{\text{th}}}}$$
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.
A Greater than
B Smaller than
C Equal to
D Either A, or B ; depends on the type of packing
Stacked packing compared to dumped packing
A Provides poorer contact between the fluids
B Gives lower pressure drop
C Both A & B
D Gives higher pressure drop
Deformation band is absent in materials having __________ lattice crystal structure.
A Fcc
B Bcc
C Hcp
D None of these
Quartz crystal is most commonly used in crystal oscillators because ___________
A It has superior electrical properties
B It is easily available
C It is quite inexpensive
D None of the above
The crystal oscillator frequency is very stable due to ___________ of the crystal
A Rigidity
B Vibrations
C Low Q
D High Q
If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient
A Positive
B Zero
C Negative
D None of the above
Which of the following packing materials provides for maximum mass transfer?
A Lessig rings
B Raschig rings
C Cross-partition rings
D All of the above
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
A Size
B Durability
C Porosity
D Cost

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