GPAT Pharmaceutical Engineering Syllabus

Pharmaceutical Engineering syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Pharmaceutical Engineering in GPAT, not a summary of it.

1. 1

   Material of Constructions

   1 topic

   • Types of Materials Used in Pharmaceutical Engineering
2. 2

   Drying

   1 topic

   • Mechanism of Drying
3. 3

   Size Reduction and Size Separation

   1 topic

   • Milling and Screening Techniques
4. 4

   Extraction

   1 topic

   • Principles of Extraction
5. 5

   Mixing

   1 topic

   • Mixing Equipment and Techniques
6. 6

   Crystallization

   1 topic

   • Crystallization Process and Techniques
7. 7

   Automated Process Control Systems

   1 topic

   • Introduction to Automation in Pharmaceutical Processes
8. 8

   Industrial Hazards & Safety Precautions

   1 topic

   • Risk Assessment and Safety Measures in Pharmaceutical Industry
9. 9

   Evaporation

   1 topic

   • Evaporation Techniques in Pharmaceutical Industry
10. 10

    Distillation

    1 topic

    • Distillation Process in Pharmaceutical Engineering
11. 11

    Fluid Flow

    1 topic

    • Fluid Mechanics Principles in Pharmaceutical Engineering
12. 12

    Heat Transfer

    1 topic

    • Heat Transfer Applications in Pharmaceutical Processes
13. 13

    Filtration and Centrifugation

    1 topic

    • Filtration and Centrifugation Techniques in Pharmaceutical Industry
14. 14

    Dehumidification and Humidity Control

    1 topic

    • Importance of Humidity Control in Pharmaceutical Manufacturing
15. 15

    Refrigeration and Air Conditioning

    1 topic

    • Refrigeration and Air Conditioning Systems in Pharmaceutical Facilities

Pharmaceutical Engineering flashcards for GPAT

20 of 70 cards from the Pharmaceutical Engineering deck — real questions with worked answers.

1. What is the chief requirement for materials used in pharmaceutical equipment construction, and which material best satisfies it?

   They must be corrosion-resistant, non-reactive, non-toxic and easy to clean. Stainless steel (especially SS 316/316L) best satisfies this and is the most widely used.

2. Why is stainless steel grade 316L preferred over 304 in pharmaceutical equipment?

   316L contains molybdenum (2-3%) and low carbon, giving superior resistance to chlorides/acids and to weld-zone corrosion (intergranular corrosion), making it ideal for product-contact surfaces.

3. Name the main classes of materials of construction used in pharmaceutical engineering.

   Metals (stainless steel, copper, aluminium), glass and glass-lined steel, plastics/polymers (PTFE, PVC, polypropylene), rubber/elastomers, and ceramics.

4. What property is measured by 'Ra' value for pharmaceutical equipment surfaces, and what is a typical acceptable limit?

   Ra is the surface roughness (average). Product-contact surfaces are typically polished to Ra <= 0.8 micrometre (about 0.4 µm for high-purity) to minimise product adhesion and aid cleaning.

5. Define drying and distinguish 'bound' from 'unbound' moisture.

   Drying is removal of small amounts of liquid (usually water) from a solid by vaporisation. Bound moisture is held by physical/chemical forces and exerts a vapour pressure below that of pure liquid; unbound moisture exerts the full vapour pressure of pure liquid.

6. Describe the phases of a typical drying-rate curve.

   After an initial settling period, there is a constant-rate period (surface moisture evaporates, surface temperature = wet-bulb temperature), followed by falling-rate periods (rate limited by internal moisture diffusion) ending at the equilibrium moisture content.

7. What is the critical moisture content in drying?

   The moisture content at the end of the constant-rate period (the transition point), where the surface can no longer be kept fully wetted and the drying rate begins to fall.

8. What is equilibrium moisture content?

   The moisture content at which a solid is in equilibrium with the surrounding air at a given temperature and humidity; the solid will not dry below this value under those conditions.

9. Which drying method is best suited for thermolabile and sterile products, and on what principle does it work?

   Freeze drying (lyophilisation). The material is frozen and water is removed by sublimation under vacuum (ice -> vapour without melting), preserving heat-sensitive and sterile products.

10. How does a fluidised bed dryer achieve rapid drying?

    Hot air is passed upward through a bed of particles at a velocity that suspends (fluidises) them, giving a very large gas-solid contact area and excellent heat/mass transfer, so drying is fast and uniform.

11. Differentiate size reduction (milling) from size separation (screening).

    Milling reduces particle size by mechanical force; screening (sieving) separates an already-milled powder into fractions of defined size ranges. Milling changes size; screening only sorts existing sizes.

12. List the principal mechanisms of size reduction in milling.

    Cutting, compression (crushing), impact, and attrition (shear/rubbing). Most mills use a combination of these.

13. For which type of materials is a ball mill suitable, and how does it reduce size?

    Suitable for brittle, abrasive and even sterile/wet materials. A rotating cylinder partly filled with balls reduces size by impact (balls cascading) and attrition (balls rolling), at an optimum speed below the critical speed.

14. What is the critical speed of a ball mill?

    The rotational speed at which the centrifugal force pins the balls to the mill wall so they no longer cascade; effective grinding occurs at 50-80% of critical speed.

15. State Stokes' law as applied to particle size and explain its relevance to milling/separation.

    v = d^2 (rho_p - rho_f) g / (18 eta), where v is settling velocity, d particle diameter, rho densities, eta fluid viscosity. It governs sedimentation/elutriation methods used to size-separate fine particles.

16. Which sieve/mesh relationship is fundamental: how does mesh number relate to aperture size?

    Mesh number is the number of apertures per linear inch; a higher mesh number means smaller aperture (finer powder). They are inversely related.

17. Define extraction in pharmacy and name its underlying principle.

    Extraction is separation of medicinally active constituents from crude drugs using a selective solvent (menstruum). It is based on differential solubility and mass transfer (diffusion) of solute from the drug (marc) into the solvent until equilibrium.

18. Differentiate maceration from percolation as extraction methods.

    Maceration: drug is soaked in solvent in a closed vessel for a set period with occasional shaking (static, equilibrium-limited). Percolation: solvent flows slowly through a packed bed of drug in a percolator (dynamic, continuous fresh solvent), giving more complete extraction.

19. What is the principle of continuous hot extraction using a Soxhlet apparatus?

    Solvent is repeatedly distilled, condensed onto the drug, and siphoned back, so fresh solvent continuously contacts the drug. It gives exhaustive extraction with a small solvent volume but is unsuitable for thermolabile constituents.

20. What is 'menstruum' and 'marc' in extraction?

    Menstruum is the solvent (or solvent mixture) used to extract the active constituents; marc is the exhausted, insoluble drug residue left after extraction.

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