The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

A

Long vertical evaporator

B

Horizontal tube evaporator

C

Agitated film evaporator

D

Calenderia vertical tube evaporator

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

A

Is economical in operation

B

Employs high velocity, high heat transfer rate and less heating surface requirement

C

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

D

Both B & C

Forced circulation evaporators are normally used for concentrating liquids having

A

Scaling characteristics

B

High viscosity

C

Both A & B

D

Neither A nor B

P,Q, R, S, T, V and W are seven friends .Each of them likes a particular fruit, viz. Apple, Banana, pear, Guava , Orange, Mango and Watermelon and each of them has a favorite city, viz. Mumbai , pune, Delhi, Kolkata, chennai, Hyderabad and Cochin . The choices of fruit and favorite city of the seven friends aren't necessarily in the same order. Q likes Mango and his favorite city is chennai . The one shose favorite city is pune likes Watermelon . T's favorite city is Kolkata. R likes Guava and is favorite is not Mumbai. W's favorite city is cochin and he does not lide either Banana or pear. The favorite city of the one who likes Orange is Hyderabad. T does no like pear. P's favorite city is neither Pune nor Hyderabad. S does not like Watermelon . who likes Apple?

A

W

B

T

C

V

D

P

In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?

A

Long tube vertical evaporator

B

Short tube vertical evaporator

C

Horizontal tube evaporator

D

None of these

Black liquor is converted into white liquor by

A

Evaporation and burning the concentrate followed by causticisation of products

B

Multi-effect evaporation only

C

Selective liquid extraction

D

Extractive distillation

In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of

A

Concrete

B

Wood

C

Steel

D

Porcelain

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A

More

B

Less

C

Same

D

Could be more or less depending on other factors

A contractor employed 30 men to do a piece of work in 38 days. After 25 days , he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?

A

1

B

114

C

134

D

112

In forced circulation type boiler

A

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C

Feed pump is employed to supplement natural circulation in water wall type furnace

D

Water is converted into steam in one pass without any recirculation

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

Related Questions