Multiple effect evaporators ar used to

Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

A

Practical limit reached, due to low heat transfer rate because of inadequate temperature difference

B

Economic limit reached, when the plant cost exceeds the saving of steam

C

Both A & B

D

Neither A nor B

Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

A

P and Q

B

P and R

C

P and S

D

R and S

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

If the integer A is multiple of 6, the integer B is multiple of 3 and A>B>0, then A2-B22 msut be multiple of following integers?

A

6

B

8

C

9

D

10

Each of the following problem has a question and two statements which are labeled 1. and. Use the data given in 1. and 2. to decide whether the statements are sufficient to answer the question.Select one of the following . a.Statements (1) ALONE is sufficient,but (2) ALONE is not sufficient. b.Statements (2) ALONE is sufficient,but (1) ALONE is not sufficient. c. Both statement TOGETHER are sufficient but statement alone is sufficient . Is K a multiple of 6? (1)K is a multiple of 3. (2) K is a multiple of 12.

A

B

C

D

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

A

High co-efficient of thermal expansion

B

Low thermal conductivity

C

High corrosion resistance

D

All of the above

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 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 thermostatic expansion valve is used in ________ type of evaporators.

A

Flooded

B

DX coil

C

Dry

D

None of these

Multiple effect evaporators ar used to

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