In forced recirculation type boiler,

When there is no recirculation of sewage, then recirculation factor is

A

0

B

1

C

Infinity

D

None of the above

Forced recirculation of furnace gases is practised

A

To increase heat transfer by convection

B

To ensure uniform temperature

C

In furnaces, operating below 750°C

D

All of the above

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

The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.

A

Electromagnetic

B

Reciprocating

C

Centrifugal

D

Volute

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

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

The capacity of induced draft fan compared to forced draft fan in a boiler is

A

Same

B

More

C

Less

D

Less or more depending on size of boiler

Which of the following boiler works on a forced circulation of water?

A

Lamont boiler

B

Benson boiler

C

Loeffler boiler

D

All of these

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A

Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler

B

Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

C

Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes

D

Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A

More

B

Less

C

Equal

D

None of these

In forced recirculation type boiler,

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