During drying operation, it is easier to remove the __________ moisture.

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

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

T^1.5

D

T³

Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

A

Unbound

B

Free

C

Critical

D

Bound

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

During drying of a solid, the critical moisture content increases with

A

Decreased drying rate

B

Increased thickness of the solid

C

Increased drying rate

D

Both B and C

The critical moisture content in case of drying indicates the __________ rate period.

A

Beginning of falling

B

Beginning of constant

C

End of falling

D

None of these

Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?

A

Elaiden test

B

Reichart-Meissl value test

C

Henter value test

D

Iodine value test

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

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

During drying operation, it is easier to remove the __________ moisture.

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