Reason for operating an evaporator in multiple effect is to secure

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has

A

Lower heat transfer area

B

Lower steam economy

C

Higher steam economy

D

Higher solute concentration in the product

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

A

Total heat transfer area of all the effects is -less than that in a single effect evaporator system

B

Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

C

Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system

D

Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system

For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

A

3

B

0.33

C

1

D

1.33

In a multiple effect evaporator, the effect of boiling point elevation is to

A

Reduce the capacity

B

Reduce the economy

C

Increase the economy

D

None of these

In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.

A

n^th

B

$${\left( {\frac{1}{{\text{n}}}} \right)^{{\text{th}}}}$$

C

0.5 n^th

D

1.5 n^th

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

A

Same

B

More

C

Less

D

More or less depending on ambient conditions

Optimum number of effects in a multiple effect evaporator is decided by the

A

Cost benefit analysis

B

Floor area availability

C

Terminal parameters

D

Evaporation capacity required

In a backward feed multiple effect evaporator

A

Feed is introduced in the first effect

B

Feed flows from low pressure to high pressure

C

No pumps are required between successive effects

D

None of these

Economy of a multiple effect evaporator is not influenced much by the

A

Boiling point elevations

B

Temperature of the feed

C

Rate of heat transfer

D

Ratio of the weight of the thin liquor to thick liquor

Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of

A

Nickel

B

Copper

C

Stainless steel

D

Brass

Reason for operating an evaporator in multiple effect is to secure

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