Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

Heat Transfer
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.7

0.4

0.6

0.5

0.7

0.4

0.6

0.5

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Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

the heat capacity is not constant and there is a phase change.

there exists an unsteady state

none of the listed here

heat transfer co-efficient over the entire heat exchanger is not constant

the heat capacity is not constant and there is a phase change.

there exists an unsteady state

none of the listed here

heat transfer co-efficient over the entire heat exchanger is not constant

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Heat Transfer
It is not preferable to use superheated steam in evaporators, because of its very

low film co-efficient

high temperature

none of the listed here

high pressure

low film co-efficient

high temperature

none of the listed here

high pressure

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Get economical temperature difference by using moderate pressure steam

Achieve very high concentration of the final product

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

Get economical temperature difference by using moderate pressure steam

Achieve very high concentration of the final product

Facilitate forward feeding in multiple effect evaporation

Concentrate heat sensitive materials

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

>10

10

Either B or C, depends on the mass of the body

>10

10

Either B or C, depends on the mass of the body

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Heat Transfer
Rate of crystallisation does not depend upon the

Extent of supersaturation

Number and active surface area of the crystals

None of these

Turbulence within the solution

Extent of supersaturation

Number and active surface area of the crystals

None of these

Turbulence within the solution

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Heat Transfer

Heat Transfer Log mean temperature difference (LMTD) cannot be used, if

Heat Transfer It is not preferable to use superheated steam in evaporators, because of its very

Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

Heat Transfer Rate of crystallisation does not depend upon the

Heat Transfer
Log mean temperature difference (LMTD) cannot be used, if

Heat Transfer
It is not preferable to use superheated steam in evaporators, because of its very

Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

Heat Transfer
Rate of crystallisation does not depend upon the