Q. The other part than the constant rate period in the Batch- Drying curve is falling rate period.

View solution

Q. Find the gas phase mass transfer co-efficient for a unbound moisture to remove if the flux is 5 kg/sq.m sec and the difference in humidity of the liquid and the main stream is 0.5 units.

View solution

Q. The value of _________ remains constant while drying if speed and direction of gas flow never change.

View solution

Q. If the dry spot appears in the substance in the batch drying curve at ___________

View solution

Q. After critical moisture content _________ starts.

View solution

Q. After the unsaturated drying completed ________ starts to evaporate.

View solution

Q. Find the time taken to dry 50% to 40% of moisture (dry basis) if critical moisture content is 30%. If the weight of the wet solid is 5 kg and the product of area and the constant rate is 0.5 kg/min.

View solution

Q. Find the period if the initial and the final moisture content are 60% and 40%. Also the critical moisture content is 30%.

View solution

Q. Find the period if the initial and the final moisture content are 50% and 20%. Also the critical moisture content is 30%.

View solution

Q. At the constant drying period of a batch process, the rate of drying varies accordingly.

View solution

Q. Find the change in moisture content from the given data.

Given data:

Time for drying= 6 sec
Area * Constant rate = 8 kg per sec
Weight of wet solid = 100 kg

View solution

Q. Find the initial moisture content for the batch process if the final moisture content is 25% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period)

View solution

Q. Find the final moisture content for the batch process if the initial moisture content is 75% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period)

View solution

Q. Falling rate period of a batch process starts at

View solution

Q. If the time taken for the moisture removal is obtained from the formula

Time = Ss(Xc – Xe)/ Nc * A ln ((X1-Xe)/(X2-Xe))

then the falling curve will be curves symmetrically

Where, Ss= Wet solid weight
Xc,Xe- constant & equilibrium moisture content
X1,X2 – initial and final moisture content

View solution

Q. There will be a change in the rate of drying of a batch process after the constant drying process.

View solution

Q. Falling rate period of the batch drying curve = _______ + ___________

View solution

Q. Find the region if the final and the initial moisture content are 40% and 30% (Dry basis) and the critical moisture content is 45%.

View solution

Q. Find the moisture to be evaporated per kg of dried product if initial and final moisture content per kg of dry solid is 85% and 15%.

View solution

Q. Convert 80% of moisture in wet basis to dry basis ( kg water/kg dry solid)

View solution