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

For the same draught produced the power of induced draught fan as compared to forced draught fan is

A

less

B

more

C

same

D

not predictable

The main advantage of forced draft over natural draft is that

A

Combustion of fuel is complete

B

Smaller height chimney can be used

C

Furnace control is easier

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

Power required in case of forced draught as compared to induced draught (for the same draught produced) is

A

Same

B

Less

C

More

D

Either more or less; depends on the flue gas density

In a furnace employing forced draught as compared to induced draught,

A

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

B

The fan operates hot and hence blades are liable to corrosion and erosion

C

Positive pressure exists in the furnace

D

None of these

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

Steam in water tube boiler as compared to fire tube boiler

A

Can be raised rapidly

B

Is raised at slower rate

C

Is raised at same rate

D

Could be raised at fast/slow rate depending on design

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

A

More heating surface

B

Less heating surface

C

Equal heating surface

D

Heating surface depends on other parameters

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

A

Same

B

Slightly less

C

Slightly more

D

Much more

The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

A

Increases

B

Decreases

C

Remains unchanged

D

Increases/decreases depending on steam temperature requirements

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

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