In a backward feed multiple effect evaporator

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

A

Higher economy

B

Lower capacity

C

Both A & B

D

Lower economy

The advantage of backward feed multiple effect evaporators over forward feed units is that

A

Heat sensitive material can be handled

B

There is no additional cost of pumping

C

Most concentrated liquid is at highest temperature

D

Equal heat transfer co-efficients exist in various effects

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

Fqra cold viscous feed, backward feed gives __________ than forward feed.

A

A higher capacity

B

A lower capacity

C

Lower economy

D

None of these

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 forward feed multiple effect evaporator, the pressure is

A

Highest in last effect

B

Lowest in last effect

C

Same in all effects

D

Dependent on the number of effects

In a forward feed multiple effect evaporator unit

A

Viscosity of liquid is highest in first effect

B

Transfer from effect to effect is done by pumps

C

No pump is required to withdraw the product from the last effect

D

None of these

On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

A

Greater degree of separation with a fixed number of trays

B

Increased reboiler load

C

Increased reflux ratio

D

None of these

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 backward feed multiple effect evaporator

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