What type of atmosphere should be used for milling thermolabile, easily oxidizable, and
combustible materials?
combustible materials?
Anonymous Quiz
3%
a) Normal air
15%
b) Dehumidified air
79%
c) Inert atmosphere of carbon dioxide or nitrogen
3%
d) High-pressure atmosphere
Why might a cooling jacket or heat exchanger be necessary during milling?
Anonymous Quiz
3%
a) To reduce energy consumption
93%
b) To prevent heat-related changes in the material and avoid stalling of the mill
3%
c) To increase milling efficiency
1%
d) To maintain a specific particle size
What factor is crucial for a mill to operate satisfactorily?
Anonymous Quiz
72%
a) The feed should be of the proper size and enter at a fairly uniform rate
6%
b) The mill should have a high-energy output
9%
c) The mill should have a wide range of speed settings
13%
d) The mill should be able to change between wet and dry milling
When is wet grinding recommended?
Anonymous Quiz
28%
a) If the product undergoes physical or chemical change in water
54%
b) If the product requires further size reduction and flocculation is not an issue
11%
c) If the product is sensitive to heat
6%
d) If the product is required to have a specific particle shape
What is a key factor to consider when selecting a mill for pharmaceutical applications?
Anonymous Quiz
17%
a) The product's resistance to size reduction
17%
b) The mill's versatility of operation
58%
c) Dust control to prevent loss of costly drugs and contamination
8%
d) The mill's ability to process a wide range of materials
Which of the following is NOT a non-thermal method of drying?
Anonymous Quiz
3%
A) Expression of a solid
3%
B) Extraction of liquid using a solvent
2%
C) Adsorption of water using desiccants
93%
D) Heating the material
What is one purpose of drying in the pharmaceutical industry?
Anonymous Quiz
88%
A) In the preparation of granules in tablets and capsules
4%
B) To increase the weight of the material
3%
C) To promote bacterial growth
4%
D) To make materials less stable
How does drying aid in the preservation of animal and vegetable drugs?
Anonymous Quiz
1%
A) By increasing the weight of the material
8%
B) By promoting mold and bacterial growth
91%
C) By minimizing mold and bacterial growth
1%
D) By making the material less stable
What does psychrometry determine?
Anonymous Quiz
1%
A) The temperature of the material
98%
B) The vapor concentration and carrying capacity of the gas
1%
C) The weight of the material
0%
D) The stability of the material
What is the term for the concentration of water vapor in a gas?
Anonymous Quiz
11%
A) Vapor pressure
8%
B) Relative humidity
75%
C) Humidity
6%
D) Absolute humidity
🔥1👏1
On a psychrometric or humidity chart, what does the horizontal axis represent?
Anonymous Quiz
82%
A) Temperature
10%
B) Absolute humidity
4%
C) Pressure
4%
D) Relative humidity
What is the wet-bulb temperature?
Anonymous Quiz
5%
A) The temperature of the air
79%
B) The equilibrium of heat transfer between air and liquid
10%
C) The temperature of the liquid
6%
D) The temperature of the solid material
👏1
How is the wet-bulb temperature measured?
Anonymous Quiz
7%
A) Using an ordinary thermometer
87%
B) Using a thermometer with a bulb covered by a water-saturated wick
3%
C) By calculating the difference in vapor pressure
2%
D) By measuring the humidity of the gas
What is the dry-bulb temperature?
Anonymous Quiz
26%
A) The equilibrium of heat transfer between air and liquid
53%
B) The temperature of the air
4%
C) The temperature of the liquid
17%
D) The temperature of the solid material
👏1
What are the two main operations involved in drying?
Anonymous Quiz
5%
A) Heat and pressure transfer
2%
B) Mass and pressure transfer
88%
C) Heat and mass transfer
4%
D) Pressure and temperature transfer
What is the driving force for heat transfer in drying?
Anonymous Quiz
8%
A) Pressure differential
23%
B) Humidity differential
62%
C) Temperature differential
7%
D) Mass differential
👎1👏1
How can the rate of drying be accelerated? (Choose the incorrect option)
Anonymous Quiz
9%
A) By increasing the air flow rate
12%
B) By raising the inlet air temperature
66%
C) By reducing the air velocity
13%
D) By dehumidifying the inlet air