In natural circulation type boiler,

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

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

A

Viscosity

B

Density

C

Thermal conductivity

D

Corrosive nature

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

A

Internally fired boiler

B

Externally fired boiler

C

Natural circulation boiler

D

Forced circulation boiler

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A

Internally fired boiler

B

Externally fired boiler

C

Natural circulation boiler

D

Forced circulation boiler

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

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A

Blow off cock

B

Fusible plug

C

Stop valve

D

Safety valve

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A

Increases

B

Decreases

C

Remain unaffected

D

First increases and then decreases

while there is -- single newspaper with a large national circulation, many magazines have national circulation .

A

not

B

noe

C

no

D

not any one

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

In accelerated 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

In natural circulation type boiler,

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