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
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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
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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
How is the wet-weight moisture content of a solid represented?
Anonymous Quiz
9%
A) Water content as a percentage of the weight of the dry solid
79%
B) Water content as a percentage of the weight of the wet solid
4%
C) Water content as a percentage of the weight of the air
8%
D) Water content as a percentage of the weight of the water
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How is the Loss on Drying (LOD) calculated?
Anonymous Quiz
11%
A) [(wt of water in sample / wt of dry sample)] × 100
82%
B) [(wt of water in sample / wt of wet sample)] × 100
4%
C) [(wt of wet sample / wt of dry sample)] × 100
3%
D) [(wt of wet sample / wt of water in sample)] × 100
How is moisture content determined on a dry-weight basis?
Anonymous Quiz
4%
A) [(wt of water in sample / wt of wet sample)] × 100
87%
B) [(wt of water in sample / wt of dry sample)] × 100
7%
C) [(wt of wet sample / wt of dry sample)] × 100
2%
D) [(wt of wet sample / wt of water in sample)] × 100
❤1
In the study of drying rate, what is plotted as moisture content versus time?
Anonymous Quiz
30%
A) Drying rate vs moisture content
57%
B) Moisture content vs drying time
5%
C) Drying time vs temperature
8%
D) Temperature vs moisture content
👎3❤2🔥1👏1
In which period of the drying curve does the drying rate depend on the diffusion rate?
Anonymous Quiz
34%
A) Constant rate period
19%
B) First falling rate period
37%
C) Second falling rate period
10%
D) Equilibrium moisture period
When is continued drying considered a waste of time and energy?
Anonymous Quiz
4%
A) During the constant rate period
9%
B) During the first falling rate period
10%
C) During the second falling rate period
77%
D) After the equilibrium moisture period begins
Which type of solid is more difficult to dry?
Anonymous Quiz
8%
A) Crystalline solids
89%
B) Amorphous solids
2%
C) Solids with no pores
2%
D) Solids with large pores
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What is the major criterion for classifying dryers based on method of sample handling?
Anonymous Quiz
25%
A) Heat sensitivity of the material
61%
B) Presence or absence of agitation
8%
C) Nature of the liquid to be removed
5%
D) Scale of operation
Which of the following is not a classification of dryers based on method of sample handling?
Anonymous Quiz
3%
A) Static-bed dryers
3%
B) Moving-bed dryers
3%
C) Fluidized-bed dryers
91%
D) Vacuum dryers
In a tray dryer, how can the exposed surface area be increased?
Anonymous Quiz
5%
A) By increasing the temperature of the air
88%
B) By decreasing the thickness of the bed
3%
C) By increasing the size of the cabinet
3%
D) By increasing the number of trays
What type of dryer is the Turbo-Tray Dryer?
Anonymous Quiz
4%
A) Static-bed dryer
89%
B) Moving-bed dryer
4%
C) Fluidized-bed dryer
3%
D) Pneumatic dryer
In a Fluidized-Bed System, what is the state of the solids?
Anonymous Quiz
27%
A) Completely suspended in the gas stream
68%
B) Partially suspended in the gas stream
4%
C) Settled at the bottom of the dryer
1%
D) Adhered to the walls of the dryer
What is one advantage of using a Fluidized Bed Dryer?
Anonymous Quiz
2%
A) Lower drying rate
3%
B) Reduced heat and mass transfer
12%
C) More aggregation and migration of colo
83%
D) High drying rate due to efficient heat and mass transfer