What is the definition of relative humidity?

( frac{Actual , vapour , density}{minimum , vapour , density} )

( frac{Actual , vapour , density}{saturation , vapour , density} )

( frac{Actual , vapour , density}{minimum , vapour , density} )

( frac{Saturation , vapour , density}{maximum , vapour , density} )

( frac{Actual , vapour , density}{Theoretical , vapour , density} )

What is the term K in the given equation of multi-molecular adsorption? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )

k is the moisture content for a complete layer

k is the enthalpy difference in adsorptive heats between the first and successive molecular layers

What is the term X1 in the given equation? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi))} )

Moisture content for a complete layer

Moisture content for three layers together

Moisture content for a complete monolayer

Consideration of multi-molecular adsorption leads to an equation given below for moisture content.

( frac{X}{X_1} = frac{C phi}{(1+k phi)(1+(C-k) phi)} )

( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )

( frac{X}{X_1} = frac{C phi}{(1+k phi)(1+(C-k) phi)} )

( frac{X}{X_1} = frac{C phi}{(1-k phi)(1-(C-k) phi)} )

( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C+k) phi)} )

12 + Mcqs in Dryers Moisture Isotherms in Heat Transfer Operations Page 1 McqOptions

1.	What is the definition of relative humidity?
A.	( frac{Actual , vapour , density}{saturation , vapour , density} )
B.	( frac{Actual , vapour , density}{minimum , vapour , density} )
C.	( frac{Saturation , vapour , density}{maximum , vapour , density} )
D.	( frac{Actual , vapour , density}{Theoretical , vapour , density} )
Answer» B. ( frac{Actual , vapour , density}{minimum , vapour , density} )

Discussion

2.	Which one of the following is the correct representation of adsorption desorption diagram?
A.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11a.png"><img alt="The following is the correct representation of adsorption desorption diagram - option a" class="alignnone size-full wp-image-248373" height="214" sizes="(max-width: 321px) 100vw, 321px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11a.png 321w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11a-300x200.png 300w" width="321"/></a>
B.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png"><img alt="The following is the correct representation of adsorption desorption diagram - option b" class="alignnone size-full wp-image-248374" height="208" sizes="(max-width: 313px) 100vw, 313px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png 313w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b-300x199.png 300w" width="313"/></a>
C.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11c.png"><img alt="The following is the correct representation of adsorption desorption diagram - option c" class="alignnone size-full wp-image-248375" height="211" sizes="(max-width: 316px) 100vw, 316px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11c.png 316w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11c-300x200.png 300w" width="316"/></a>
D.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11d.png"><img alt="The following is the correct representation of adsorption desorption diagram - option d" class="alignnone size-full wp-image-248376" height="211" sizes="(max-width: 317px) 100vw, 317px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11d.png 317w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11d-300x200.png 300w" width="317"/></a>
Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png"><img alt="The following is the correct representation of adsorption desorption diagram - option b" class="alignnone size-full wp-image-248374" height="208" sizes="(max-width: 313px) 100vw, 313px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b.png 313w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-moisture-isotherms-q11b-300x199.png 300w" width="313"/></a>

Discussion

3.	What is the term K in the given equation of multi-molecular adsorption? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )
A.	k is the relative humidity
B.	k is the exp ( H/RT)
C.	k is the moisture content for a complete layer
D.	k is the enthalpy difference in adsorptive heats between the first and successive molecular layers
Answer» C. k is the moisture content for a complete layer

Discussion

4.	What is the term X1 in the given equation? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi))} )
A.	Equilibrium moisture content
B.	Moisture content for a complete layer
C.	Moisture content for three layers together
D.	Moisture content for a complete monolayer
Answer» E.

Discussion

5.	Consideration of multi-molecular adsorption leads to an equation given below for moisture content.
A.	( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )
B.	( frac{X}{X_1} = frac{C phi}{(1+k phi)(1+(C-k) phi)} )
C.	( frac{X}{X_1} = frac{C phi}{(1-k phi)(1-(C-k) phi)} )
D.	( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C+k) phi)} )
Answer» B. ( frac{X}{X_1} = frac{C phi}{(1+k phi)(1+(C-k) phi)} )

Discussion

6.	Which one of the following isotherm is of prime interest in drying?
A.	Langmuir isotherm
B.	Desorption isotherm
C.	Moisture isotherm
D.	Adams s isotherm
Answer» C. Moisture isotherm

Discussion

7.	Moisture isotherms are normally _________ in shape when plotted over the whole relative humidity range.
A.	Sigmoid
B.	Exponential
C.	Parabolic
D.	Hyperbolic
Answer» B. Exponential

Discussion

8.	Isothermal variation of the equilibrium moisture content which is a function of this free-energy change with relative humidity yields a ____________
A.	Langmuir isotherm
B.	Moisture isotherm
C.	Adams isotherm
D.	Pressure isotherm
Answer» C. Adams isotherm

Discussion

9.	The free energy G required to release unit molal quantity of this moisture is given by G = RT Ln( ), for an isothermal, reversible process without change of composition.
A.	True
B.	False
Answer» B. False

Discussion

10.	What is the term in the given equation of free energy G required to release unit molal quantity of this moisture? G = RT Ln( )
A.	Absolute Humidity
B.	Relative Humidity
C.	Mole fraction of water
D.	Moisture content
Answer» C. Mole fraction of water

Discussion

11.	The free energy G required to release unit molal quantity of this moisture is given by ___________
A.	RT Ln(Relative Humidity)
B.	RT Ln(Mole fraction of water)
C.	RT Ln(Moisture content)
D.	RT Ln(Absolute Humidity)
Answer» B. RT Ln(Mole fraction of water)

Discussion

12.	The lower the relative humidity _________ is the moisture bound to the host material.
A.	Weaker
B.	Stronger
C.	More quantity
D.	Less volume
Answer» C. More quantity

Discussion

Explore topic-wise MCQs in Heat Transfer Operations.

What is the definition of relative humidity?

Which one of the following is the correct representation of adsorption desorption diagram?

What is the term K in the given equation of multi-molecular adsorption? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )

What is the term X1 in the given equation? ( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi))} )

Consideration of multi-molecular adsorption leads to an equation given below for moisture content.

Which one of the following isotherm is of prime interest in drying?

Moisture isotherms are normally _________ in shape when plotted over the whole relative humidity range.

Isothermal variation of the equilibrium moisture content which is a function of this free-energy change with relative humidity yields a ____________

The free energy G required to release unit molal quantity of this moisture is given by G = RT Ln( ), for an isothermal, reversible process without change of composition.

What is the term in the given equation of free energy G required to release unit molal quantity of this moisture? G = RT Ln( )

The free energy G required to release unit molal quantity of this moisture is given by ___________

The lower the relative humidity _________ is the moisture bound to the host material.

What is the term K in the given equation of multi-molecular adsorption?
( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi)} )

What is the term X1 in the given equation?
( frac{X}{X_1} = frac{C phi}{(1-k phi)(1+(C-k) phi))} )

The free energy G required to release unit molal quantity of this moisture is given by
G = RT Ln( ), for an isothermal, reversible process without change of composition.

What is the term in the given equation of free energy G required to release unit molal quantity of this moisture?
G = RT Ln( )