Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

Closeness of packing is maximum in case of __________ crystal lattice.

A

Face centred

B

Simple cubic

C

Body centred

D

None of these

Deformation band is absent in materials having __________ lattice crystal structure.

A

Fcc

B

Bcc

C

Hcp

D

None of these

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

There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

A

One

B

Two

C

Three

D

None of these

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

A

Equal to

B

Greater than

C

Less than

D

Either A, B or C; depends on the size of atom

The defect which takes place due to imperfect packing of atoms during crystallization is known as

A

Line defect

B

Surface defect

C

Point defect

D

None of these

How many atoms are there per unit cell in a body centred cubic lattice system?

A

2

B

3

C

4

D

6

Materials having __________ lattice structure are usually the most ductile.

A

Body centred cubic (bcc)

B

Hexagonal close packed (hcp)

C

Face centred cubic (fcc)

D

None of these

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

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