Related Questions

Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
A Poor oxidation stability and high gum forming tendency
B Greater tendency of decomposition at elevated temperature
C Hydrolysis tendency in presence of water
D All of the above
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?
A Flow rate of inlet air
B Relative humidity of outlet air
C Humidity of inlet air
D Temperature of the solid
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
A $$\sqrt {\text{T}} $$
B T
C T1.5
D T3
Advantage of continuous drying over batch drying is that the
A Drying cost per unit weight of dried product is less
B Product with more uniform moisture content is produced
C Equipment size required is smaller
D All of the above
In the constant rate period of the rate of drying curve for batch drying,
A Cracks develop on the surface of the solid
B Rate of drying decreases abruptly
C Surface evaporation of unbound moisture occurs
D None of these
During constant rate drying period, vaporisation rate per unit drying surface area
A Decreases with time
B Increases with time
C Does not change with time
D Does not affect the moisture content of the wet solid
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
A Increases
B Decreases
C Does not affect
D Exponentially increases
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
A Humidity
B Velocity
C Temperature
D All of the above
Unsaturated oils compared to saturated oils have
A Lower melting point & higher reactivity to oxygen
B Higher melting point & higher reactivity to oxygen
C Lower melting point & lower reactivity to oxygen
D Higher melting point & lower reactivity to oxygen
Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.
A Drying
B Semi-drying
C Non-drying
D None of these

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