In a single effect evaporator, the economy is

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

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

In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

A

Increases

B

Decreases

C

Remains constant

D

May increase or decrease, depends on the vacuum

What is the steam economy in case of a single effect evaporator system?

A

1

B

> 1

C

0.1

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

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

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

Steam economy in case of a triple effect evaporator will be

A

1

B

> 1

C

Between 0 and 1

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

Economy of a multiple effect evaporator depends upon the

A

Heat balance consideration

B

Rate of heat transfer

C

Both A and B

D

Neither A nor B

In a single effect evaporator, the economy is

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