July 14, 2021: Pharmaceutical Interview Questions and Answers

1. What are the different sizes of hard gelatin capsules?

The capsule sizes are 000, 00, 0, 1, 2, 3, 4, and 5 from the largest to the smallest. There are few special size of capsule are available such as 2el, 1el, 0el, 0el+, 0xel, 00el etc. Details are tabulated below.

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2. What are the US Mesh size and corresponding micron, mm and inch for commonly used sieves, provide few examples?

U.S. MeshMicronsInchesMillimeters
367300.26506.730
447600.18794.760
540000.15704.000
633600.13203.360
728300.11102.830
823800.09372.380
1020000.07872.000
1216800.06611.680
1414100.05551.410
1611900.04691.190
1810000.03941.000
208400.03110.841
257070.02800.707
305950.02320.595
355000.01970.500
404000.01650.400
453540.01380.354
502970.01170.297
602500.00980.250
702100.00830.210
801770.0070.177
1001490.00590.149
1201250.00490.125
1401050.00410.105
170880.00350.088
200740.00290.074
230630.00240.063
270530.00210.053
325440.00170.044
400370.00150.037
450320.00130.032
500250.00100.025
550250.00090.023
635200.00080.020
800150.00060.015
1250100.00040.010

Reference: ASTM E11

3. Give examples of sieve size and corresponding number of Apertures per Linear inch.

Sr. No.Sieve SizeNumber of Apertures per Linear Inch
110 #9-11
212#11-13
314#13-15
416#15-17
520#19-21
624#23-25
730#28-32
840#38-42
960#57-63
1080#77-83
11100#97-103

4. What is aperture size of screen?

The size of a square opening (length of clear space between individual wires) is called the aperture size of screen.

5. What is Mesh number of screen?

Mesh number of screen is defined as number of aperture or opening per liner inch of the screen.  E.g. A screen having 10 square opening per inch is said to have Mesh no. 10. Higher the mesh number, smaller the aperture size of screen.

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